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  • An investigation of Oregon weight-in-motion data for bridge rating implementation and evaluation

    Creator:
    Pelphrey, Jordan Michael
    Abstract:
    The LRFR Manual, within commentary Article C6.4.4.2.3, contains provisions for development of site-specific live load factors. In Oregon, truck Weigh-in-Motion (WIM) data were used to develop live load factors for use on state-owned bridges. The factors were calibrated using the same statistical methods that were used in the original development...
    Resource Type:
    Masters Thesis
    Full Text:
    Oregon Weigh-In-Motion Data for Bridge Rating Implementation and Evaluation. Abstract approved: C

  • 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
    Full Text:
    report presents a laboratory investigation of the dynamic behavior of saturated alluvial silty soils

  • Consistency and effectiveness of advisory speeds: an evaluation of current posting techniques

    Creator:
    Rohani, Joshan W.
    Abstract:
    Crash rates are said to be nearly three times higher on curved sections than those on straight sections of rural roadways. As a result, advisory curve/speed signs are standard practice to mitigate these risks on sharp horizontal curves. The industry standard for determining appropriate and uniform speeds for such signs...
    Resource Type:
    Masters Thesis
    Full Text:
    report includes data collected from 166 randomly selected sites. Eighty of the sites were located on

  • Investigation of the behavior of diagonally cracked full-scale CRC deck-girders injected with epoxy resin and subjected to axial tension

    Creator:
    Smith, Matthew T. (Matthew Todd)
    Abstract:
    Article 1: Behavior of Epoxy Injected Diagonally Cracked Full-Scale CRC Deck-Girders. Many cast-in place reinforced concrete deck-girder bridges (RCDG) remain in the national inventory and exhibit diagonal cracking. Epoxy injection has been in use for several decades as a method for sealing diagonal cracks, but the effects on girder behavior...
    Resource Type:
    Masters Thesis
    Full Text:
    been validated. Much of the existing data regarding performance of members injected with epoxy have

  • 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
    Full Text:
    data from cyclic tests performed at Oregon State University and other universities formed the basis

  • 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:
    adjusted to match the microcosm data. Having defined the parameter values from laboratory studies, the

  • Analysis of conventionally reinforced concrete deck girder bridges for shear

    Creator:
    Potisuk, Tanarat
    Abstract:
    Large numbers of 1950's vintage conventionally reinforced concrete (CRC) bridges remain in-service in the national bridge inventory. Many of these bridges are lightly reinforced for shear. Evaluation of these bridges to prevent unnecessary and costly repairs requires refined analytical techniques. This dissertation presents finite element (FE) modeling and comparisons of...
    Resource Type:
    Dissertation
    Full Text:
    configurations. Load distribution was developed for the bridges based on the field data. Comparisons with AASHTO

  • Kinetic and modeling investigations of the anaerobic reductive dechlorination of chlorinated ethylenes using single and binary mixed cultures and silicon-based organic compounds as slow-release substrates

    Creator:
    Yu, Seungho
    Abstract:
    This study investigated complete reductive dechlorination of chlorinated aliphatic hydrocarbons (CAHs) over a broad range of concentrations. Tetrabutoxysilane (TBOS), as a slow-release anaerobic substrate, was studied for enhanced reductive dechlorination of tetrachioroethylene (PCE) present as a dense non-aqueous liquid (DNAPL). Four different site-mixed cultures were used in the study: Site-300...
    Resource Type:
    Dissertation
    Full Text:
    ethylenes. Competitive inhibition models simulated well the inhibition experimental data. Inhibition

  • A formal model of construction safety and health risk management

    Creator:
    Hallowell, Matthew R.
    Abstract:
    Despite recent efforts to improve site safety, construction still accounts for a disproportionate injury and illness rate. According to the 2007 injury and illness data released by the National Safety Council, the construction industry has a fatality and disabling injury rate that is approximately three times higher than the all-industry...
    Resource Type:
    Dissertation
    Full Text:
    accounts for a disproportionate injury and illness rate. According to the 2007 injury and illness data

  • Normal acceleration characteristics of the leading vehicle in a queue at signalized intersections on arterial streets

    Creator:
    Zhu, Hong
    Abstract:
    Normal acceleration characteristics of passenger cars provide valuable information for various aspects of transportation engineering, including use in the geometric designs of intersections, freeway ramps, passing lanes, acceleration lanes, turning bays, or in the development of traffic simulation or fuel consumption models. However, the data used in previous studies are...
    Resource Type:
    Masters Thesis
    Full Text:
    development of traffic simulation or fuel consumption models. However, the data used in previous