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Title |
Effects of Inelastic Demand Spectrum on Seismic Capacity Evaluation of Curved Bridge by Capacity Spectrum Method
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Keywords |
역량스펙트럼방법 ; 내진성능 ; 강도감소계수 ; 비탄성요구스펙트럼 ; 지진응답변위 ; 곡선교 ; Capacity spectrum method ; Seismic capacity ; Strength reduction factor ; Inelastic demand spectrum ; Seismic response displacement ; Curved bridge |
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Abstract |
The capacity spectrum method(CSM) has been more frequently used as a tool to evaluate the seismic capacity of the structure. Many formulas of strength reduction factors(SRF) have been proposed and adopted to generate the inelastic demand spectrum for the CSM. This study evaluates the impacts of the type of the SRF on the inelastic demand spectrum and finally on the seismic response displacement of curved bridge. For the purpose, the several existing formulas of SRFs were comparatively investigated through the case study. Curved bridges with different subtended angles were selected and the displacements of the bridge piers were estimated by using the different formulas of SRFs. Nonlinear time history analyses were also performed for the validation purpose of the CSM results. According to study results, the CSM may generate the larger displacement responses than the actual behaviors for the curved bridge with larger subtended angles. Though many methods have been suggested to generate the inelastic demand spectrum for CSM, they might not give noticeable differences in inelastic displacement of the bridge pier.
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