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采用大型有限元分析软件,对中国西南某铁路特大桥8#墩进行了静力弹塑性(Pushover)分析,得到了结构能力曲线,并以谱加速度和残余位移漂移比作为地面运动强度度量参数和工程需求参数,对高墩大跨桥梁结构进行了脆弱性分析。分析结果表明:当其他条件相同时,随着界限状态的提升,结构要达到相同的概率所需的地面运动强度呈递增趋势;当地面运动作用强度相同时,基阶加载模式计算的脆弱性曲线低估了结构的抗震性能,而均布和SRSS组合加载的脆弱性分析又过分高估了结构的抗震能力。
A large-scale finite element analysis software was used to carry out Pushover analysis of 8 # pier of a railway bridge in southwest China. The curve of structural capacity was obtained. The spectral acceleration and residual displacement drift ratio were taken as the parameters of ground motion intensity and Engineering requirements parameters, the fragility analysis of high pier and long-span bridge structure. The results show that when the other conditions are the same, with the increase of the boundary state, the ground movement intensity required by the structure to achieve the same probability shows an increasing trend. When the ground surface motion intensity is the same, the vulnerability curve calculated by the base-order loading mode The seismic performance of the structure is underestimated, while the vulnerability analysis of the uniform loading and the SRSS combined loading overestimates the seismic capacity of the structure.