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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。
The 2-stage seismic design method of bridges focuses on the ductility of the bridge structure under rare earthquakes in order to meet the seismic fortification requirements of major earthquakes. A pushover analysis method combining capability assessment and target displacement prediction provides a simplified analysis method for the stress behavior under rare earthquakes in bridge structures. Two kinds of displacement calculation methods of capability spectrum method and equivalent SDOF nonlinear time history method were respectively used to conduct pushover analysis of two reinforced concrete arch bridges and compare them with the results of dynamic elasto-plastic time history analysis. The results show that the pushover method can accurately predict the maximum lateral displacement of RC arch bridges under rare earthquakes, but the prediction accuracy of the maximum displacement response of RC beams is relatively poor. The research conclusion provides a reference for the seismic performance evaluation of rare earthquakes in reinforced concrete arch bridge.