Seismic performance assessment of reinforced concrete overpass bridges with nonlinear analyses

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2022-2

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Cantürk, Tolga

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In this study, seismic performance assessment of reinforced concrete overpass bridges located along the currently under construction Kınalı-Tekirdağ-Çanakkale-Savaştepe Highway was conducted. Overpass bridges consisted of two-span precast concrete girders and reinforced concrete cast-in-place circular cross section columns. Because of proximity to active faults detailed seismic investigation of the region had already been conducted and site-specific seismic design spectrums had been developed. Structural design of these bridges is based on response spectrum analyses considering 2475 year return period seismic event. AASHTO (2017) iteration method was used to determine the internal plastic forces used in design of columns. To better understand and assess the performance levels of the overpass bridges accurately, nonlinear static pushover and time history analyses were conducted. In pushover analysis, lumped plastic hinge model was assumed for column hinges at possible hinge locations, while a distributed plastic hinge model was used with fiber section was employed in time-history analysis. In numerical analysis models special attention was paid to accurately reflect the effect of girder ends pounding against the cap beams and shear keys at pier and abutment locations. Performance levels of overpass bridges were evaluated according to Turkish Bridge Earthquake Standard (2020 ) using the pushover and time history analysis results.

Subject Keywords

Nonlinear pushover analysis, Nonlinear time history analysis, Lumped plastic hinge model, Distributed plastic hinge model, Fiber section, Performance level

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https://hdl.handle.net/11511/96294

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

T. Cantürk, “Seismic performance assessment of reinforced concrete overpass bridges with nonlinear analyses,” M.S. - Master of Science, Middle East Technical University, 2022.