摘要
采用非线性结构有限元软件SAP2000建立了全长492 m的大跨度高速铁路钢桁梁斜拉桥动力分析模型,根据实际工程场地条件从NGA-West2数据库中选取了4条地震动记录作为地震激励,分别基于位移法与大质量法进行了动力响应分析,评估了2种方法在大跨度高速铁路斜拉桥动力响应分析中的计算精度。研究结果表明:基于位移法进行结构动力响应分析会出现工程上难以接受的误差,该方法不适用于大跨度高速铁路斜拉桥非一致激励计算;基于大质量法进行结构动力响应分析的精度较高,该方法是复杂大跨度结构非一致激励分析的有效手段。
A dynamic analytical model of a large-span was established by nonlinear finite element software high speed railway cable-stayed bridge with total length of 492 m SAP2000. According to practical engineering site condition, 4 earthquake records were selected from NGA-West 2 database as input seismic excitations. Dynamic response analysis based on displacement method and large mass method was conducted respectively. The precision of two methods applied on large-span high speed railway cable-stayed bridge was evaluated. The results show that the dynamic response analysis based on displacement method may leads to unacceptable error in engineering. The displacement method is not suitable for non-uniform excitation of large-span high speed railway cable-stayed bridge. The dynamic response analysis based on large mass method bridge reaches high accuracy on large-span high speed railway cable- stayed bridge. The large mass method is a valid way for non-uniform excitation of comtflex large-soan structure.
出处
《铁道建筑》
北大核心
2017年第7期5-8,共4页
Railway Engineering
基金
中国工程院咨询研究项目(2015-05-ZD-002)
关键词
高速铁路
非一致激励
有限元分析
斜拉桥
地震响应
High speed railway
Non-uniform excitation
Finite element analysis
Cable-stayed bridge
Seismicresponse
