【摘要】 本文将易损性曲面方法拓展应用于近场地震动潜在破坏性效应对桥梁结构的影响分析,考虑近场和一般场地地震动效应,对某钢筋混凝土(RC)桥梁结构地震易损性进行了分析。该方法综合考虑了RC桥梁本身和烈度指标(IM)的不确定性以及桥梁体系的损伤特性,以评估近场地震效应的潜在破坏性。以一座城市桥梁为例,易损性分析结果表明:对RC桥梁结构进行地震易损性分析时,单一标量IM会低估地震动潜在破坏性效应,近场地震效应会增加桥梁结构的损伤概率。与传统标量的易损性曲线相比,本文方法可以有效地反映地震动烈度引起的RC桥梁结构失效概率变化。更多还原

【Abstract】 The seismic fragility surface analysis method is extended into vulnerability analysis of RC bridges subjected to near-fault ground motion. Compared with classical site condition,the near-fault effect on the RC bridges is conducted. The assessment of the damage potential of near-fault ground motion has taken into account the uncertainty of RC bridge and of intensity measure( IM) and the damage characteristics of bridges. An urban bridge is taken as the analysis model. Fragility surfaces of the RC bridge illustrates that,taking into account the complexity of the seismic excitation,the scalar IM tends to neglect some important characteristics of ground motion when conducting the seismic vulnerability analysis. The near-fault effect will increase the failure probability. Compared with the fragility curves formed with scalar IM,the fragility surfaces can reflect the variability of vulnerability failure probability of the RC bridges caused by the variation of intensity measurement parameter. The fragility surface analysis can evaluate the seismic performance of the RC bridges more accurately.更多还原