【摘要】 桥梁2阶段抗震设计方法关注桥梁结构罕遇地震下的延性性能,以达到大震不倒抗震设防要求。采用能力评估和目标位移预测相结合的pushover分析方法为桥梁结构罕遇地震下的受力行为提供了一种简化分析方法。分别采用能力谱方法和等效SDOF非线性时程分析2种目标位移计算方法,对2座已建钢筋混凝土拱桥进行pushover分析,并与动力弹塑性时程分析结果进行对比。研究结果表明:pushover分析方法可准确预测钢筋混凝土拱桥罕遇地震下横桥向最大位移响应,但对纵桥向最大位移响应的预测精度相对较差。研究结论为钢筋混凝土拱桥罕遇地震下抗震性能评估提供参考依据。更多还原

【Abstract】 In order to reach the aim of "without collapse under major earthquake",the ductility performance of bridges was more concerned in two-stage seismic design method recently.Pushover analysis method that consists of capacity evaluation and demand displacement prediction provided a simplified method to analyse bridge’s mechanical behavior under exceptionally serious earthquake.Both capacity spectrum method and equivalent SDOF nonlinear time-history analysis method that aim to predict demand displacement were applied for pushover analysis of two existing reinforced concrete arch bridge.To check the accuracy of the proposed methods,the demand displacement obtained by dynamic elasto-plastic analysis under exceptionally serious earthquake was used as benchmark for comparison.The result shows that the pushover analysis method can give accurate estimation of the maximum displacement response of RC arch bridge in the transverse direction under exceptionally serious earthquake,while having poor prediction in longitudinal direction.The study could provide a reference for seismic evaluation of RC arch bridge under major earthquake ground motion.更多还原