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Filtering by: Creator Letchworth, Christopher A. Remove constraint Creator: Letchworth, Christopher A. Advisor Higgins, Christopher C. Remove constraint Advisor: Higgins, Christopher C.

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  • Shear repair methods for conventionally reinforced concrete girders and deep beams

    Creator:
    Howell, Daniel A.
    Abstract:
    Many conventionally reinforced concrete deck girder bridges (RCDG) and their intermediate supporting bent caps were designed during the Eisenhower interstate era of the 1950’s with the AASHO design equations at the time, which subsequently place higher demand on the concrete. The referenced components may exhibit diagonal cracking due to the...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF DANIEL A. HOWELL for 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:
    Deck-Girder Bridge Bent Caps with Vintage Details Abstract approved: Christopher C. Higgins

  • Experimental and analytical investigation of ponding load effects on a steel joist roof system

    Creator:
    Stark, Duncan
    Abstract:
    Ponding of water on roof systems leading to collapse causes expensive damage and jeopardizes the life safety of building occupants. Current building codes and design specifications for flat roof systems offer minimal guidance in designing for ponding loads. The present research investigated ponding load effects on a long span, lightweight...
    Resource Type:
    Masters Thesis
    Full Text:
    , 2009. Title: Experimental and Analytical Investigation of Ponding Load Effects on a Steel Joist

  • Direct Shear Interface Friction and Linear Motion Shaking Response of Ecoroofs

    Creator:
    Kilroy, Kimberly A.
    Abstract:
    Ecoroofs have become more prominent in recent years. However, there is currently no enforceable standard or building code for the design and construction of ecoroofs across the United States (Kraupa, 2014). Further research is needed to determine how ecoroofs respond to roof motion and to develop an appropriate design standard.The...
    Resource Type:
    Masters Thesis
    Full Text:
    Response of Ecoroofs AN ABSTRACT OF THE THESIS OF Kimberly A Kilroy for the degree of Master of

  • Applying climate change information to hydraulic and hydrologic transportation infrastructure

    Creator:
    Al Naabi, Rawan Y.
    Abstract:
    Scour is the main cause of bridge failures in the United States. Bridge failures raise a hazard to the safety of the traveling public as well as the massive economic consequences due to the high cost of constructing a new or a replacement bridge. The Oregon Department of Transportation (ODOT)...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Christopher C. Higgins Scour is the main cause of bridge failures in the United States

  • Structural Effects of Hydraulic Loading and Drainage of Ecoroofs and Preliminary Consideration of Associated Design Loading Scenarios

    Creator:
    Thompson, Lucas E.
    Abstract:
    As ecoroofs have become more widespread throughout the U.S., it has become increasingly important to understand their structural behavior. The purpose of this research was to investigate the load effects exerted on a roof structure with an ecoroof during rain events and the subsequent drainage period, with the intention of...
    Resource Type:
    Capstone Project
    Full Text:
    : ______________________________________________________ Christopher C. Higgins As ecoroofs have become more widespread throughout the U.S., it has

  • Behavior of open grid steel bridge decks under service and fatigue loads

    Creator:
    Fetzer, Peter C.
    Abstract:
    Open grid steel bridge decks have been in use for nearly a century. These open grid decks provide an economical and lightweight alternative to traditional reinforced concrete decks. As the transportation infrastructure continues to deteriorate, open grid decks can be used as a cost effective way to rehabilitate structurally deficient...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ Christopher C. Higgins Open grid steel bridge decks have been in use for nearly a century

  • Image rectification tool for evaluation of gusset plate connections in steel truss bridges

    Creator:
    Nguyen, Quang D.
    Abstract:
    A methodology was developed to permit rectification and metrification of digital images of steel truss gusset plate connections. The approach will enable rapid and accurate collection of field measurements as compared to traditional methods to enable structural evaluation of gusset plate connections. The program enables the operator to quickly create...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ Christopher C. Higgins A methodology was developed to permit rectification and

  • 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:
    a passive energy dissipation tension- compression yielding brace or buckling restrained brace has

  • Shear capacity assessment of corrosion-damaged reinforced concrete beams

    Creator:
    Farrow, William C.
    Abstract:
    The research presented here is a study to determine the effect of shear reinforcement corrosion on the shear capacity in conventionally reinforced concrete (CRC) bridge elements. A total of 14 CRC beams were tested using three stirrup spacings (8, 10, and 12-inch). Six of the beams included the influence of...
    Resource Type:
    Masters Thesis
    Full Text:
    Assessment of Corrosion-Damaged Reinforced Concrete Beams Abstract Approved: Christopher C. Higgins The