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  • Cross-laminated timber engineering : improvement and application

    Creator:
    Kramer, Anthonie
    Abstract:
    The development of cross-laminated timber (CLT) panel technology has opened up new opportunities for wood in tall buildings. Several characteristics including seismic performance and speed of construction have raised interest among designers. As CLT gains acceptance in the industry, alternative structural solutions need to be investigated to improve performance of...
    Resource Type:
    Masters Thesis
    Full Text:
    Engineering and Wood Science presented on March 14, 2014. Title: Cross-Laminated Timber Engineering

  • Characterization of reinforced fill soil, soil-reinforcement interaction, and internal stability of very tall MSE walls

    Creator:
    Walters, James J.
    Abstract:
    In many geotechnical design situations involving tight right-of-way constraints, Mechanically Stabilized Earth (MSE) walls are often the most cost-effective and reliable earth retention technology among available alternatives. However, few well-documented case histories with detailed material testing, instrumentation programs and construction observation of performance are available in the literature. Despite the...
    Resource Type:
    Masters Thesis
    Full Text:
    Engineering presented on August 14, 2013. Title: Characterization of Reinforced Fill Soil, Soil

  • Dynamic response of an offshore structure to measured and simulated stochastic wave forces

    Creator:
    Grecco, Michael G.
    Abstract:
    The dynamic response of an offshore structure to measured and simulated stochastic wave forces is investigated. The theoretical nondeterministic analysis is performed in the frequency domain for a two-dimensional model. The ocean wave system is assumed to be a zero mean, stationary, ergodic Gaussian process described by a one-dimensional wave...
    Resource Type:
    Masters Thesis
    Full Text:
    has arisen to express this process 14 in a way that is easily incorporated into the dynamic design

  • Evaluation of the torsion test for determining the shear strength of structural lumber

    Creator:
    Heck, Leanne Renee
    Abstract:
    The torsion test was evaluated as a method for determining the shear strength of full-size structural lumber. The evaluation involved an experimental length study, an experimental depth study, and a finite element study. The length study consisted of fifty nominal 2x4 specimens, ten specimens for each length, and ten American...
    Resource Type:
    Masters Thesis
    Full Text:
    Testing and Materials (ASTM) shear blocks. One 14 foot long board yielded one specimen for each length

  • Optimizing the performance of gypsum wall board in wood frame shear walls

    Creator:
    Goodall, Scott I.
    Abstract:
    The overall goal of this project was to design a wood frame shear wall that could withstand greater displacement before damage occurred to the Gypsum Wall Board (GWB). More specifically, the objectives of the study were: (1) to evaluate damage to the GWB in alternative shear wall designs at 1%,...
    Resource Type:
    Masters Thesis
    Full Text:
    levels. A total of 14 shear walls consisting of seven different designs with two walls built per

  • Prototype-Scale Physical Model Study of Wave Attenuation by an Idealized Mangrove Forest of Moderate Cross-shore Width

    Creator:
    Kelty, Kiernan M.
    Abstract:
    The use of natural and nature-based features for coastal hazard mitigation, particularly emergent vegetation such as mangrove forests, have become increasingly popular. However, the protection that these systems can provide has not been fully quantified for engineering design, and the uncertainties in parameterized equations have not been fully defined. In...
    Resource Type:
    Masters Thesis
    Full Text:
    diameter of the roots, DRoot, was 0.0286 m with 14 roots per tree. Two model forest densities of 0.75 and

  • Tidal influence on downstream fining in gravel-bed rivers

    Creator:
    Coles, Derron Rafiq
    Abstract:
    This research examines the downstream fining phenomenon as it operates in coastal gravel-bed rivers of Oregon. Downstream fining is a change in bed composition toward smaller sediment sizes in the downstream direction. Changes in stream flow discharge and channel slope affect the rate of bed-load transport, thereby altering the downstream...
    Resource Type:
    Dissertation
    Full Text:
    mile 0 to river mile 14 (0 – 22.5 km). Photo frame sampling was carried out for the armor layer of

  • Steel confined yielding damper for earthquake resistant design

    Creator:
    Newell, James D.
    Abstract:
    An experimental study of a passive energy dissipation tension-compression yielding brace or buckling restrained brace has been conducted. The Confined Yielding Damper (CYD) consists of a steel yielding core confined within a tube filled with non-cohesive media. The external tube and confined non-cohesive media provide lateral stability to the core...
    Resource Type:
    Masters Thesis
    Full Text:
    specimens. 29 13. Three-story building plan (Sabelli, 2000) used for time history analysis. 31 14. Three

  • Development of a new mixture proportioning method and assessing the influence of material characteristics on flowing concrete mixtures

    Creator:
    Hendrix, Greg
    Abstract:
    Cast-in-drilled-hole (CIDH) piles are often constructed to depths that are inaccessible to internal vibration of the concrete. Internal vibration is necessary to consolidate the concrete and, if not performed, then typically inspection pipes are necessary to detect the presence of voids in CIDH piles. Void detection is critical to assessing...
    Resource Type:
    Masters Thesis
    Full Text:
    ................................................................ 14 Figure 2.3 Example of relating the FA/CAmin to the AVmin values.............................. 18

  • A stochastic precipitation event model for use in erosion simulations

    Creator:
    Istok, J. D.
    Abstract:
    Mathematical models of the precipitation process are needed to effectively use historical precipitation data in the design and planning of engineering projects and for analysis of watershed runoff behavior. Existing simple models based on the assumptions of independent, identically-distributed random variables are insufficient to describe several features of the historical...
    Resource Type:
    Dissertation
    Full Text:
    108 14 Illustration of counting process N(t) 109 15 Monthly values of quartiles of the distribution

  • Use of Virtual Visual Sensors in the Determination of Natural Frequencies of Timber Structures for Structural Health Monitoring

    Creator:
    Walker, Kristopher
    Abstract:
    Many nondestructive techniques for structural health monitoring are subjective and based on visual observations of degradation. In addition, dynamic properties of structures are already used to obtain quantitative structural health data. However, most current data collection is limited to localized damage on the structure, rather than global response. Recent research...
    Resource Type:
    Masters Thesis
    Full Text:
    East of Jefferson, OR ................... 14 Figure 3 - Underside of Shimanek Covered Bridge Located

  • The mechanics of gas transfer in oxidation lagoons

    Creator:
    Mausshardt, Donald Bruce
    Resource Type:
    Masters Thesis
    Full Text:
    Thesis . . . . . 2 rli8tory of the Ox1dat10 Lagoons . . 2 DISCUSSION OF PROBLE!' , , , . , . , . 14

  • An evaluation of coastal Oregon's marginal aggregates

    Creator:
    Clemmons, Gregory H.
    Abstract:
    Coastal Oregon is deficient in quality construction aggregates. There is, however, an abundance of lower quality, or marginal, aggregate available for construction purposes. An evaluation of these marginal aggregates is the purpose of this paper. There are four classes of marginal rocks found on the Oregon Coast. Basalts, high in...
    Resource Type:
    Masters Thesis
    Full Text:
    14 Results of Modified Proctor Compaction 56 15 Moisture Contents, w, and Percent of Maximum Density

  • Applications of Marine Radar Wave Observation Systems

    Creator:
    Meskill, Shay J.
    Abstract:
    This project utilized both shore-based and shipboard commercial marine radar technology to collect wave statistics. In the first application a shore-based system was installed at Yaquina Bay in Newport, Oregon in order to collect real-time wave information. This information was collected under the auspices of the Northwest Association of Networked...
    Resource Type:
    Capstone Project
    Full Text:
    ................................................................................................14! 4.1 Site Conditions -- Newport

  • Performance of partially and fully anchored wood frame shear walls under monotonic, cyclic and earthquake loads

    Creator:
    Seaders, Peter
    Abstract:
    The objectives of this study were to evaluate the performance of wood frame shear walls under monotonic, cyclic and earthquake loads by: (1) estimating the variability of shear wall performance, (2) comparing the performance of walls under each loading protocol, (3) evaluating the effects of anchorage on wall performance, and...
    Resource Type:
    Masters Thesis
    Full Text:
    Protocols 8 Test Matrix 10 Data Analysis 11 RESULTS & DISCUSSION 14 Variability Analysis & Protocol

  • Influence of transport parameters on the fresh and hardened characteristics of ready-mixed concrete

    Creator:
    Chen, Jiaming
    Abstract:
    Most specifications for ready-mix concrete (RMC) limit mixing time to 90 minutes and/or truck drum revolution counts (DRC) to 300 before discharge. These specifications have been in place for many years with the objective of ensuring the quality and performance of the finished concrete product. However, limited research has been...
    Resource Type:
    Masters Thesis
    Full Text:
    .............................................. 14 2.6 TEST RESULTS AND ANALYSIS—FIELD STUDY ................................ 18 2.6.1 Fresh

  • Effectiveness of curve advisory speed signs : a characterization of road operations in western Oregon

    Creator:
    Avelar Morán, Raúl Eduardo
    Abstract:
    Posting advisory speed signs at sharp horizontal curve locations is a common practice in the U.S. These signs recommend drivers safe speeds to negotiate such curves. Literature indicates that adherence to advisory speeds is, in general, poor. Moreover, limited research is available that quantifies safety implications of these signs. This...
    Resource Type:
    Masters Thesis
    Full Text:
    Rohani. ........................ 14 3.2-2. Sampling Stages Followed by Dixon and Rohani for State

  • Aerobic cometabolism of chlorinated aliphatic hydrocarbons by a butane-grown mixed culture : transformation abilities, kinetics and inhibition

    Creator:
    Kim, Young
    Resource Type:
    Dissertation
    Full Text:
    .......................................................................... 14 Mechanism-Based Inactivation ............................................... 15 Kinetics for

  • Improving the Performance of High Early Strength Concrete by Controlling Self-Desiccation and Mitigating Shrinkage

    Creator:
    Wilson, Cameron A.
    Abstract:
    High early strength (HES) concrete is becoming increasingly used to repair damaged concrete pavement sections. The use of HES concrete enables the repaired pavement to be opened to traffic within hours of placing the concrete. A common approach used for the rapid repair of concrete pavement consists of closing a...
    Resource Type:
    Masters Thesis
    Full Text:
    . ....................................................................................................... 14 Figure 2-3: Measured RH values for different temperatures and saturated salt solutions before

  • Digital simulation of multi-dimensional random processes and its applications

    Creator:
    Ahn, Gil Soo
    Abstract:
    This dissertation introduces a method which can simulate multi-dimensional Gaussian random processes by the superposition of sine functions The fast Fourier transform technique is incorporated into the simulating method to facilitate saving of computer time. In view of the fact that the fast Fourier transform play important roles in digital...
    Resource Type:
    Dissertation
    Full Text:
    results of above 50 12 Program for external storage 53 13 Continuation of above 54 14 Spectrum for

  • Stability of gravel at artificially created spawning beds in uncontrolled streams

    Creator:
    Helland-Hansen, Erik Andreas
    Abstract:
    Twenty-five gabion-type structures across the main stem and tributaries of the Siuslaw River in the Oregon Coastal Range, installed to expand the available spawning area for fish, were investigated for their ability to perform gravel control functions such as trapping bedload carried by the stream or holding gravel placed behind...
    Resource Type:
    Masters Thesis
    Full Text:
    parameters for long-term move- ment at low flow 108 14 Hydraulic parameters for upper Siuslaw Basin

  • The Fundamental Behavior of CLT Floor-to-Wall Connections in Fire

    Creator:
    Redus, James Aaron
    Abstract:
    This thesis focuses on the fundamental behavior of CLT floor-to-wall connections during a fire. Cross-laminated timber (CLT) panelized structures rely on floor-to-wall connections for the load path and stability of the structure. Additionally, the fire performance of these connections is critical to prevent horizontal or vertical fire spread within these...
    Resource Type:
    Masters Thesis
    Full Text:
    ........................................................................................ 12 2.3 Overview of Fire Testing Methodologies .............................................. 14

  • Establishing a through-boring pattern and method of test for utility poles

    Creator:
    Elkins, Lori A.
    Abstract:
    The goal of this study was to optimize a through-boring pattern that will provide adequate preservative penetration while minimizing the reduction in overall pole bending strength. Hole spacing was developed using longitudinal and transverse chemical penetration data from previous studies. Finite element analysis was used as a preliminary assessment tool...
    Resource Type:
    Masters Thesis
    Full Text:
    -BORING RESEARCH 6 STRESS CONCENTRATION FACTORS 10 MODELING WOOD POLES 14 TESTS METHOD FOR POLES 15

  • Wind induced torsional fatigue behavior of truss bridge verticals

    Creator:
    Keller, Philipp
    Abstract:
    The Astoria-Megler Bridge is a 6.6 kilometer (4.1 mile) long bridge, connecting Oregon and Washington on US 101, with a continuous steel truss main span of 376 m (1232 ft). It is the second longest main span bridge of this type in the world. Due to vortex shedding, some of...
    Resource Type:
    Masters Thesis
    Full Text:
    age 90 92  92  95  96  99 99  01  02  02  05  07  07 09  11  12  14  16

  • Hybridized framing to modify load paths and enhance wood shearwall performance

    Creator:
    Bultena, Sarah M.
    Abstract:
    Heavy timber framing relies primarily on bracing to withstand lateral loads due to earthquakes and wind events. Bracing configurations in heavy timber framed buildings vary widely and include cross bracing, knee bracing, and other geometries. Many heavy timber frames constructed during colonial American times are still standing, exceeding the expected...
    Resource Type:
    Masters Thesis
    Full Text:
    sheathing-framing connectors. The hysteretic model for the sheathing-framing connectors takes 14

  • Development of a mechanistic overlay design procedure for flexible pavements

    Creator:
    Zhou, Haiping
    Abstract:
    This dissertation describes the development of a mechanistic overlay design procedure. The mechanistic analysis represents a new trend in both new pavement and overlay design. The greatest advantage of the mechanistic pavement analysis is that it considers the fundamental characteristics of materials to be used, is capable of considering changes...
    Resource Type:
    Dissertation
    Full Text:
    Definition of Coefficient of Elasticity and Poisson's Ratio for the Uniaxial Case 14 2.2 Conceptual

  • Pollution and tidal flushing predictions for Oregon's estuaries

    Creator:
    Choi, Byungho
    Abstract:
    The overriding goal of this study was to provide first order estimates of dilution and tidal flushing of waste discharges released hypothetically into various Oregon estuaries during critical low flows and tides. Causal relationships between discharged wastes and subsequent estuarine response were studied. Various approaches to determine the assimilative capacity...
    Resource Type:
    Masters Thesis
    Full Text:
    estuary. 4 Modified segmentation of an Page 3tUary. 14 decrease of 24 25 estuary. 40 5 Calculated

  • Cometabolic degradation of polycyclic aromatic hydrocarbons (PAHs) and aromatic ethers by phenol- and ammonia-oxidizing bacteria

    Creator:
    Chang, Soon Woong
    Abstract:
    Cometabolic biodegradation processes are potentially useful for the bioremediation of hazardous waste sites. In this study the potential application of phenol-oxidizing and nitrifying bacteria as "priming biocatalysts" was examined in the degradation of polycyclic aromatic hydrocarbons (PAHs), aryl ethers, and aromatic ethers. We observed that a phenol-oxidizing Pseudomonas strain cometabolically...
    Resource Type:
    Dissertation
    Full Text:
    important because of their varied toxic, carcinogenic, and mutagenic properties (14). Currently 16 PAHs

  • Testing and Modeling of a Cross-Laminated Timber Pier-and-Spandrel Seismic Retrofit Solution for Unreinforced Masonry Buildings

    Creator:
    Engleson, Renee M.
    Abstract:
    Cross-laminated timber (CLT) is an attractive building material because it is renewable, promotes fast installation, and possesses a high strength-to-weight ratio. The use of CLT in seismic applications has become increasingly common with the development of post-tensioned CLT rocking wall lateral force resisting systems (LFRS). The CLT pier-and-spandrel system designed,...
    Resource Type:
    Masters Thesis
    Full Text:
    ........................................................................................................... 14 2.2.3 Wall-to-Diaphragm Anchorage

  • Development of a Reliability-Based Framework and Empirical Models for Justifying Allowable Chloride Limits and Quantifying Critical Input Variables for Predicting the Service Life of Reinforced Concrete Structures

    Creator:
    Shakouri Hassanabadi, Mahmoud
    Abstract:
    Significant progress has been made over the past 20 years in developing models to estimate the service-life of reinforced concrete systems. The basic understandings of the mechanisms that control the transport of ions and moisture in concrete systems have been well researched and models for determining corrosion initiation, specifically chloride-induced...
    Resource Type:
    Dissertation
    Full Text:
    ……………………………………………………………. 14 1.6 The relationship between the reported mean values for concrete cover depth and COV

  • Design criteria for waste water lagoons in Oregon

    Creator:
    Putnicki, George John
    Abstract:
    Waste water lagoons have been used as a satisfactory means of treating domestic and certain industrial wastes in many parts of the country. Many of the parameters that govern the applicability of this type of treatment process are climatic in nature, and critical evaluation of local climatic conditions, as well...
    Resource Type:
    Masters Thesis
    Full Text:
    9 Algae 14 Temperature 16 Light 19 Wind 31 Precipitation 35 Evaporation 37 Soil Sealing 41

  • Centrifuge Modeling of Soil Response to Tsunami-like Rapid Flooding and the Subsequent Drawdown

    Creator:
    Exton, Margaret C.
    Abstract:
    Soil instability from tsunami hazards causes substantial damage to coastal infrastructure (e.g., the damage caused by the 2011 Great East Japan Tsunami, or the Heisei Tsunami). Tsunamis are unpredictable, so it is difficult to obtain field-scale measurements. Simulating tsunamis in a laboratory setting is therefore important to further understanding of...
    Resource Type:
    Dissertation
    Full Text:
    . . . . . . . . . . . . . . . . . . . . . . 165 A.14 The initial part of the runup stage at PPT location X2 for the Imper- meable Layer

  • Light-frame versus timber frame : a study in quantifying the differences

    Creator:
    Malone, Brian P.
    Abstract:
    The objective of this study was to compare light wood framing and traditional timber framing quantitatively through environmental impact assessment and load path analysis. This research was inspired by a traditional timber frame structure constructed in Vermont in 2011, and the design of structures considered within reflect the general characteristics...
    Resource Type:
    Masters Thesis
    Full Text:
    ................................................................................................................ 14  2.7: Total energy consumption from cradle to construction gate for timber frame and light-frame

  • Field verification of a mathematical model for the physical fate prediction of dredged material instantaneously disposed at sea

    Creator:
    Hollings, William H.
    Abstract:
    Dredged spoil plumes are monitored during nine hopper dredge disposal events in 186 foot water depths offshore near Coos Bay, Oregon. Position and solids volume concentration characteristics of the plumes are established. Computer simulations of the monitored events are executed using the WES modified version of the Koh-Chang instantaneous disposal...
    Resource Type:
    Masters Thesis
    Full Text:
    39 2-13 Solid material component data summary 40 2-14 Example of component concentration plot

  • Response of equipment in resilient-friction base isolated structures subjected to ground motion

    Creator:
    Lei, Kai-ming
    Abstract:
    The response of lightweight equipment in structures supported on resilient-friction-base isolators (R-FBI) subjected to harmonic ground motion and various earthquake ground motions is examined. The equipment-structure base system is modeled as a three degree-of-freedom discrete system (SDOF subsystems). An efficient semi-analytical numerical solution procedure for the determination of equipment response...
    Resource Type:
    Dissertation
    Full Text:
    on equipment respomse versus period ratio (me/ms = 0.0001) 53 14 Effect of friction coefficient on

  • Cable dynamics in an ocean environment

    Creator:
    Tuah, Hang
    Abstract:
    The nonlinear dynamic analysis of cable and cable-large body systems subject to both deterministic and non-deterministic loading is presented in this study. Nonlinearities occur due to large displacements, material nonlinearity, lack of stiffness in compression, and the non-conservative fluid loading. A finite element model is used to model the cable...
    Resource Type:
    Dissertation
    Full Text:
    MOTIONS 13 2.1 Equation of Equilibrium 14 2.1.a General Lagrangian Description. . 17 2.1.b Total

  • Initial performance assessment for implementation of hot mix asphalt containing recycled asphalt shingles in Oregon

    Creator:
    Samoo, Faisal Ahmed
    Abstract:
    This thesis documents the evaluation of the initial performance of pavement containing recycled asphalt shingles (RAS) in Oregon. The research was funded by the Oregon Department of Transportation (ODOT) and the Federal Highway Administration and was conducted at Oregon State University. The key objectives of this thesis are to document...
    Resource Type:
    Masters Thesis
    Full Text:
    Power Gradation Chart for I5 Project RAP-only Mixes ......... 72 Figure 14: 0.45 Power Gradation Chart

  • Modeling of ammonia losses in sprinkler application of animal wastes

    Creator:
    Pote, Jonathan W. (Jonathan Woodrome)
    Abstract:
    A model to predict ammonia losses from sprinkler applied animal wastes was developed; in order to accomplish this, a review of literature was performed to determine possible methods of predicting ammonia losses during sprinkling. As adaptability to a large variety of situations was considered of maximum importance, the number of...
    Resource Type:
    Masters Thesis
    Full Text:
    aqua ammonia and ammonium salts in relation to the pH of the fertilizer solution . . . 14 8 Effect of

  • Behavior of Cross-Laminated Timber Diaphragm Panel-to-Panel Connections with Self-Tapping Screws

    Creator:
    Sullivan, Kyle
    Abstract:
    The goal of this project is to contribute to the development of design values for cross-laminated timber (CLT) diaphragms in the seismic load-resisting system for buildings. Monotonic and cyclic tests to determine strength and stiffness characteristics of 2.44 m (8 ft) long shear connections with common self-tapping screws were performed....
    Resource Type:
    Masters Thesis
    Full Text:
    ...................................................................................................14 Fig. 5. Photo of test apparatus with specimen

  • Development of structural layer coefficients for open graded asphalt emulsion mixes

    Creator:
    Hatch, David Russell
    Abstract:
    This paper describes the development of structural layer coefficients for open graded asphalt emulsion surfacing layers which can be used with the AASHO pavement design method, as modified by the U. S. Forest Service, Region 6. A field survey conducted to document the history, performance and material characteristics of in-service...
    Resource Type:
    Masters Thesis
    Full Text:
    Mixes 12 18-kip Single Axle Equivalency Factors 45 13 Determination of Regional Factors 47 14 Layer

  • Influence of Concrete and Construction Parameters on Chloride Test Measurements and Critical Chloride Threshold Limits

    Creator:
    Vaddey, Naga Pavan
    Abstract:
    The issue of chloride-induced corrosion of reinforcing steel in concrete and its economic impacts are well-known. Chlorides that cause reinforcement corrosion can be from constituent materials used to prepare concrete or can enter the hardened concrete when the structure is exposed to chloride environments. To minimize the risk of reinforcement...
    Resource Type:
    Dissertation
    Full Text:
    ..................................................................................... 14  1.4  Summary

  • Application of geostatistics to regional evapotranspiration

    Creator:
    Amegee, Kodjo Y.
    Abstract:
    Regionalized variable analysis has been used to study a number of meteorological and hydrological variables including precipitation (Delhomme and Delfinier, 1973), streamfiow (Villeneuve et al., 1979) and hydraulics of groundwater aquifers (Gambolati and Volpi, 1979). In the research work reported in this thesis, an attempt was made to characterize the...
    Resource Type:
    Dissertation
    Full Text:
    Semivariograms of reference evapotrans- piration for July 1979. 96 14 Semivariograms of reference evapotrans

  • Hinged floating breakwater : theory and experiments

    Creator:
    Leach, Patrick A.
    Abstract:
    An analytical model is developed to examine the response and efficiency of a vertical rigid, hinged, floating breakwater. The boundary value problem describing the flow field yields a well-posed Sturm-Liouville problem which is solved by separation of variables for the velocity potentials. The equation of breakwater motion about the breakwater...
    Resource Type:
    Masters Thesis
    Full Text:
    (2-6) 14 The known incident, unknown reflected and unknown transmitted wave amplitudes are

  • The application of granular activated carbon to the treatment of kraft evaporator condensate wastes

    Creator:
    Hansen, Sigurd Paul
    Resource Type:
    Masters Thesis
    Full Text:
    Iarge for some rnills, but Iess LZ in others (14). In nurnerous kraft rnills where personnel are cog

  • Determination of structural layer properties of aggregate and asphalt surfaced roads

    Creator:
    Rwebangira, T.
    Abstract:
    This study involved the determination of the structural layer properties of aggregate and asphalt surfaced pavements for use in the evaluation of pavement load carrying capacity and the seasonal effects of moisture. This was achieved by the use of Nondestructive Testing Methods (NDT) and backcalculation techniques. Pavement surface deflection measurements...
    Resource Type:
    Dissertation
    Full Text:
    2.2 Advantages and Disadvantages of NDT Equipment 14 2.3 Typical Layered Elastic Methods of Matching

  • Finite element analysis of culverts under embankments with time dependent and non-linear properties

    Creator:
    Lertlaksana, Voravit
    Abstract:
    A computer program was developed for analyzing culverts under earth embankments constructed of compacted cohesive soil using the finite element method. The culvert-embankment system is represented as a two-dimensional plane strain problem. The plane of investigation is taken normal to the culvert axis. The soil-culvert interface is assumed to be...
    Resource Type:
    Dissertation
    Full Text:
    . 14 The four triangular element stiffness matrices are combined by the code number technique (15, 18

  • Reverse osmosis membranes fouling by biopolymers in wastewater secondary effluent and membrane cleaning

    Creator:
    Xu, Zhihua
    Abstract:
    Reverse osmosis (RO) is being increasingly used in treatment of domestic wastewater secondary effluent for potable and non-potable reuse. Among other foulants, dissolved biopolymers, i.e., proteins and polysaccharides, can lead to severe fouling of RO membranes. In this study, the roles of RO membrane surface properties in membrane fouling by...
    Resource Type:
    Masters Thesis
    Full Text:
    ................................................................... 55 4-14: Schematic illustration of the change in the alginate or combined fouling layer structure

  • The performance of wood frame shear walls under earthquake loads

    Creator:
    White, Kevin Bradish DelGrande
    Abstract:
    The overall goal of this study is to evaluate the earthquake performance of wood frame shear walls, and more specifically: (1) to compare the performance differences of fully and partially anchored walls under monotonic, cyclic, and earthquake loads, (2) to compare wall performance under earthquake loads with that of standardized...
    Resource Type:
    Masters Thesis
    Full Text:
    EARTHQUAKE TIME HISTORIES 14 Selection 14 Scaling 15 TEST MATRIX 17 DATA ANALYSIS 18 Backbone Analysis

  • Investigation of Iron Passivity and Chloride-induced Depassivation in Alkaline Electrolytes using Reactive Force Field Molecular Dynamics (ReaxFF-MD)

    Creator:
    Dormohammadi, Hossein
    Abstract:
    The corrosion and passivity of iron (and carbon steel) in media with different alkalinity as well as iron depassivation have been studied extensively using electrochemical methods and nano-scale surface characterization studies. The electrochemical techniques provide valuable information about the average electrochemical behavior of relatively large metal surfaces, typically in centimeter-square...
    Resource Type:
    Dissertation
    Full Text:
    minimum energy they repel, otherwise they attract one another [104]…...………………………………...……………………….14

  • Evaluation of emulsified asphalt for use in Saudi Arabia

    Creator:
    Al-abdulwahhab, Hamad I.
    Abstract:
    Saudi Arabia currently contains 31000 km (18600 mi) of paved roads and 42000 km (25200 mi) of agricultural roads, with the prospect of more roads to be constructed. The low population (6 million) compared to the large area of the country (2,253,300 km², 900,000 mi²) coupled with the high cost...
    Resource Type:
    Dissertation
    Full Text:
    OF EMULSIFIED ASPHALTS IN SAUDI ARABIA 14 2.1 Geography of Saudi Arabia 14 2.2 Road System 18

  • Radon-222 as an in situ partitioning tracer for quantifying nonaqueous phase liquid (NAPL) saturations in the subsurface

    Creator:
    Davis, Brian M.
    Abstract:
    This study investigated the use of radon-222 as an in situ partitioning tracer for quantifying nonaqueous phase liquid (NAPL) saturations in the subsurface. Laboratory physical aquifer models (PAMs), field experiments, and numerical simulations were used to investigate radon partitioning in static (no-flow) experiments and in single-well, 'push-pull' tests conducted in...
    Resource Type:
    Dissertation
    Full Text:
    150 14 Trichioromethane CHC13 1.49 8200 160 Carbon Tetrachioride CC14 1.59 757 90 The mechanisms

  • Significant factors governing municipal water consumption

    Creator:
    Westgarth, Warren C. (Warren Cyril), 1922-2011
    Resource Type:
    Masters Thesis
    Full Text:
    , Irrigation Use . . . . . . . . ........ 14. Saien Water Consirnption Analysis, 1923-5, Commercial use

  • Nonlinear dynamic analysis of cable and membrane structures

    Creator:
    Lo, Alain
    Abstract:
    The nonlinear dynamic analysis of cable and membrane structures is presented in this study. Attention is given to the nonlinearities arising from large displacements, from nonlinear stress-strain relationships and from nonconservative loadings. The finite element method is used to model the cables and membranes. Curvilinear geometries of the elements are...
    Resource Type:
    Dissertation
    Full Text:
    14 Inflated Profiles of Cylindrical Tube Under 5.0 psi Pressure 82 15 Finite Elements Models for

  • Design data for field engineers

    Creator:
    De Jong, Tim
    Abstract:
    The author and compiler of Design Data for Field Engineers has included in his volume short cuts in design, and miscellaneous data and information used on general civil engineering projects from inception to completion. The book is intended for the engineer who may be stationed in isolated areas and who...
    Resource Type:
    Masters Thesis
    Full Text:
    Report ------------- MNM----- _habit A 13 Typical Check List -- --- ----- ---- -- Exhibit B 14 Sample

  • Ground Improvement and Liquefaction Mitigation using Driven Timber Piles

    Creator:
    Gianella, Tygh N.
    Abstract:
    Seismically-induced liquefaction represents a major cause of damage to civil infrastructure and can result in significant damage following major earthquakes. Liquefaction can occur when earthquake ground motions raise pore-water pressures in loose, sandy soil, resulting in a substantial decrease of soil strength. Owing to the potential for instability following liquefaction,...
    Resource Type:
    Masters Thesis

  • Requirements for successful irrigation systems in the Senegal River Basin (Mauritania)

    Creator:
    Abba, Fatima Zahra
    Abstract:
    Implementation of a small-scale irrigation project in southern Mauritania is analyzed in this report. The main objective is to demonstrate that small-scale irrigation farming is the best suited solution for Mauritania's agriculture. To reach this objective different steps are taken in this study. The first step highlights the different aspects...
    Resource Type:
    Masters Thesis
    Full Text:
    Factors 8 2.2.1.1 Climate 8 2.2.1.2 Hydrology of the Senegal River 14 2.2.1.2.1 Introduction 14

  • Behavior of a 1/6th scale, two-story, wood framed residential structure under surge wave loading

    Creator:
    Wilson, Jebediah
    Abstract:
    The goal of this study was to develop an understanding of the nature of surge wave loading on wood framed residential structures for a variety of building configurations and test conditions. The objectives of the study were: (1) to measure forces on a 1/6th scale wood framed residential structure, (2)...
    Resource Type:
    Masters Thesis
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    to NEESR SG Award) NEES, Grant No. CMMI-0402490 (NEES Operations) TABLE OF CONTENTS Page

  • Investigation of Drilled Shafts under Axial, Lateral, and Torsional Loading

    Creator:
    Li, Qiang
    Abstract:
    Drilled shaft foundations provide significant geotechnical resistance for support of structures, such as highway bridges, traffic sign, and signal pole structures, and are used widely to meet their structural foundation requirements. The amount of steel reinforcement in drilled shaft foundations has increased over the past several decades to account for...
    Resource Type:
    Dissertation
    Date Created:
    Full Text:
    distribution, (b) normalized (after Roeder and Lehman 2012). ...................................14  Figure 2-7

  • Design and construction of earth dams

    Creator:
    Haq, Shafiqul
    Resource Type:
    Masters Thesis
    Full Text:
    below (14,pp.4-5) and should be designed so that: 1. The spilLvay capacity is so great that there is

  • Effects of Wave Nonlinearity and Vertical Variation of Vegetation Density on Wave Attenuation

    Creator:
    Wu, Wei-Cheng
    Abstract:
    The understanding and prediction how coastal wetland vegetation attenuates wave action has received renewed attention with global climate change impacts and increasing populations on coastlines. Conventional attenuation models utilize empirical drag coefficients, but these coefficients exhibit a wide range of values, and there is some uncertainty in the relative importance...
    Resource Type:
    Dissertation
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    .................................................................................... 14   2.5  Results

  • Fluid forces on smooth and rough circular cylinders

    Creator:
    Lin, Cheng-wen
    Resource Type:
    Dissertation
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    -Carpenter Number 43 ii List of Figures -- continued Figure Page 14 Variation of Root-Mean-Square Lift

  • Input/output energy analysis of regional water pollution control

    Creator:
    Heggen, Richard J.
    Abstract:
    Two strategic approaches to water quality control in Oregon's Willamette River are presently being utilized: point source treatment and flow augmentation. Dry weather releases from reservoirs are for authorized purposes other than water quality. Reservoirs can participate in pollution control by summer flow augmentation where authorized water resource objectives (flood...
    Resource Type:
    Dissertation
    Full Text:
    Reservoir Costs 34 13 Oregon Per Capita Energy Consumption- 46 14 Willamette Basin Energy Flows 51 15

  • Geotechnical significance of poorly crystalline soils derived from volcanic ash

    Creator:
    Thrall, F. G.
    Resource Type:
    Dissertation
    Full Text:
    Atterberg limits, in the natural state. 50 List of Figures (Continued) Figure Page 14 Distribution of

  • The seismic geotechnical modeling, performance, and analysis of pile-supported wharves

    Creator:
    McCullough, Nason J.
    Abstract:
    This dissertation presents the results of a research effort conducted to better understand the seismic performance and analysis of pile-supported wharves. Given the limited number of well-documented field case histories, the seismic performance of pile-supported wharves has been poorly quantified, and the analysis methods commonly employed in engineering practice have...
    Resource Type:
    Dissertation
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    Constitutive Soil Model ........................................................................ 14 Pore

  • Computerized safety analysis technique for secondary highways

    Creator:
    Nichols, Kevin Scott
    Abstract:
    Evaluation of the safety hazards along a highway is usually performed at specific locations and on known hazards. But, it is also important to find any unrecognized hazards and their locations. Many factors contribute to accident potential, and the combined effect of several of them could produce a hazard that...
    Resource Type:
    Masters Thesis
    Full Text:
    versus Acceleration Diagram 9.1 Example Problem Plans and Characteristics Page 5 9 12 14 16 18

  • Cyclic triaxial testing of low- to moderate-plasticity silts

    Creator:
    Butler-Brown, Jason J.
    Abstract:
    This project report presents a laboratory investigation of the dynamic behavior of saturated alluvial silty soils from sites in Oregon and Washington. The focus of the study was to document the liquefaction susceptibility, post cyclic strength, and volumetric strain behavior of the silt soils based on cyclic, undrained triaxial compression...
    Resource Type:
    Masters Thesis
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    : Cyclic Loading with Stress Reversal 14 1-12: Cyclic Loading Deviator Stress with Time 14 2-1: Vicinity

  • A composite-beam finite element for seismic analysis of wood-framed buildings

    Creator:
    Lee, Chyuan-shen
    Abstract:
    A computer program called SAPWOOD which possesses the capability of performing linear or nonlinear, static or dynamic response including seismic excitation for wood-framed buildings with semirigid connection systems is presented in this study. Program SAPWOOD is a modification of the program NONSAP by adding new elements such as a linkage...
    Resource Type:
    Dissertation
    Full Text:
    ELEMENT METHOD 14 2.1. General 14 2.2. Analysis of Earthquake Response 15 2.3. Earthquake Accelerogram

  • Modeling cometabolic transformation of a CAH mixture by a butane utilizing culture

    Creator:
    Mathias, Maureen Anne
    Abstract:
    The goal of this research was to mathematically simulate the ability of bioaugmented microorganisms to aerobically cometabolize a mixture of chlorinated aliphatic hydrocarbon (CAH) compounds during in-situ treatment. Parameter values measured from laboratory experiments were applied to the transport model with biotransformation processes included. In laboratory microcosm studies, a butane-grown,...
    Resource Type:
    Masters Thesis
    Full Text:
    ) ranked these CAHs among the top 14 compounds that contributed to greater than 95% of the detections in

  • Incipient resuspension of silt-clay deposits in oscillatory and unidirectional flows

    Creator:
    Talebbeydokhti, Nasser
    Abstract:
    Incipient motion of cohesive sediment and the role of flow parameters were investigated for separate and combined unidirectional and oscillatory flows. Sediment from Sturgeon Lake, mainly silt and clay with organic matter, was used as bed material In recirculating and wave flumes. Bench-type experiments indicated that when the submerged sediment...
    Resource Type:
    Dissertation
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    . A Comparison of Relations for Critical Shear Stress as Function of Grain Diameter 73 14. Onset of

  • The effect of elevated temperature on mechanical behavior of structural wood and wood-based composites

    Creator:
    Sinha, Arijit
    Abstract:
    Engineers, in practice, are often faced with the challenge of evaluating a fire-damaged structure and developing a rehabilitation and retrofit plan. In order to decide on a rehabilitation and retrofit plan, information on thermal degradation of building materials and connections are vital. A critical knowledge gap exists in terms of...
    Resource Type:
    Dissertation
    Full Text:
    .................................................................................................. 14 Kinetics-Based Model

  • An Experimental and Numerical Investigation of Tall Mechanically Stabilized Earth Walls

    Creator:
    Strahler, Andrew W.
    Abstract:
    The implementation and construction of Mechanically Stabilized Earth (MSE) walls has undergone substantial expansions in recent years, owing to its relatively low cost, ease of construction, and high efficiency compared to conventional retaining methods. As a result, MSE walls are being constructed to greater heights with complex features (e.g. multiple...
    Resource Type:
    Dissertation

  • Dynamic behavior of silty soils

    Creator:
    Sunitsakul, Jutha
    Abstract:
    The cyclic resistance of predominantly fine-grained soils has received considerable attention following ground and foundation failures at sites underlain by silt-rich soils during recent earthquakes. In several cases substantial ground deformation and reduced bearing capacity of silt soils has been attributed to excess pore pressure generation during cyclic loading. These...
    Resource Type:
    Dissertation
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    LIST OF TABLES Table ig 1.1 Summary of proposed criteria for liquefiable fine-grained soils... 14 2.1

  • Multi-Scale Dynamic Monitoring and Behavior of Cross-Laminated Timber Elements and Systems

    Creator:
    Mugabo, Ignace
    Abstract:
    Cross-Laminated Timber (CLT) is one of the latest engineered wood products to show promising structural features for a variety of structural purposes including resisting lateral loads. For CLT to be widely adopted, its modal behavior needs to be fully evaluated through experimental and numerical methods. It is important to the...
    Resource Type:
    Dissertation
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    21 at the end of the testing sequence. (b) Power spectral densities of channel 14 E and 14N at the

  • Experimental and analytical evaluation of conventionally reinforced deck-girder bridge bent caps with vintage details

    Creator:
    Senturk, Ahmet Ekin
    Abstract:
    Many conventionally reinforced concrete deck girder (RCDG) bridges were built in the US during the 1950s, throughout the expansion of the Interstate System. Designs followed the AASHO standard of the time, which permitted higher shear stress in concrete and reduced detailing requirements than permitted by current specifications. Many of these...
    Resource Type:
    Dissertation
    Full Text:
    using the shear span to overall height ratio, av / h. Accordingly, a deep beam has an av / h 14