摘要
以一座城市轨道交通简支梁桥为背景,基于OpenSees软件平台,分别根据《城市桥梁抗震设计规范》和《城市轨道交通结构抗震设计规范》进行最高设防水准的抗震分析,并着重对两本规范的地震动输入、计算模型、抗震设计方法及结果进行了比较。结果表明:后一规范加速度反应谱峰值比前一规范大10%,且其加速度反应谱衰减较快;两规范计算模型的主要区别在基础模拟上,前者采用计算模型的基础刚度和结构刚度均比后者大,因而按前者计算的结构关键节点位移均比后者小;前者桥墩墩顶位移需求比后者小14%;对于基础的验算结果,按前者基础屈服,而按后者基础处于弹性状态。
Taking an urban rail transit simply-supported beam bridge as an example, seismic analysis of structure of the highest fortification level was conducted by using〈〈 Code for seismic design of urban bridges）） and 〈〈 Code for seismic design of urban rail transit structures）） respectively, based on OpenSees platform. The comparison of the input of seismic ground motion, analysis model, seismic design method and results of the two codes were emphasized. The result shows that the peak value of acceleration response spectrum calculated by the latter code is 10% larger than what calculated by the former one and the acceleration response spectrum of latter code attenuates quickly. The main difference of two analysis model is the foundation simulation method, and the stiffness of foundation and structure calculated by the former code is larger than what calculated by the latter one so that the displacement of the key nodes calculated by the former is smaller; The seismic demand of pier top displacement of the former is 14% smaller than the latter; As for the seismic checking results, the foundation is in the state of yield according to the former code while it stays in elastic state according to the latter one.
作者
周连绪
叶爱君
刘腾飞
ZHOU Lian-xu;YE Ai-jun;LIU Teng-fei(State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, Chin)
出处
《土木工程与管理学报》
北大核心
2017年第6期121-125,140,共6页
Journal of Civil Engineering and Management
基金
国家自然科学基金(51278375)
