Graduate Thesis Or Dissertation
 

Reliability based bridge assessment using modified compression field theory and Oregon specific truck loading

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cj82kb88q

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  • Assessment of an existing bridge is needed when the structure exhibits signs of distress. Assessment practices require refinement in the calculation of loading and resistance while maintaining an acceptable level of risk, to minimize costs associated with repair, replacement and weight restrictions. Previous risk-based assessments evaluated the strength cases for shear and moment individually and used the live load model in the American Association of State and Highway Transportation Officials (AASHTO) specification. The methodology for assessment presented here is for use by the State of Oregon, which has over 500 cast-in-place reinforced concrete deck-girder (RCDG) bridges exhibiting distress in the form of diagonal tension cracks. It integrates full-scale testing for capacity, which found that the girder capacity requires assessment of shear and moment simultaneously, with field data and an Oregon specific truck loading. A live load model (load spectrum) is developed for Oregon using the available weigh-in-motion (WIM) data for truck traffic on Oregon State highways. Field data are used to estimate live load distribution factors. Results (including a statistical characterization) from full-scale laboratory testing of RCDGs revealed the section capacity is reasonably predicted using modified compression field theory (MCFT) accounting for shear and moment interaction. Potentially critical sections in a girder are defined and load effect (shear and moment) and capacity are calculated at each section. The statistical characterization for MCFT is considered for the section capacity and is compared to the load effect (shear and moment), which is considered to be deterministic. A second-moment reliability index (β) is calculated and used to determine the critical section in a girder. Using the annual load effects produced by WIM data, a low cycle fatigue (LCF) evaluation is made for the critical section to address the issue of yielding in the stirrups. The assessment methodology can be applied to other structural members (i.e., bent caps, and columns) using appropriate capacity models as recommended by future research efforts. Once applied to the bridge system, use of both the safety assessment and LCF evaluation will enable engineers to rationally establish load restrictions based on an owner selected target reliability index developed for the State's bridge inventory, prioritize bridges (or segments of a bridge) for repair, and evaluate how repeated events that cause yielding in the stirrups may reduce the life of a bridge.
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