摘要
地震发生时,高墩大跨连续刚构桥各支承点所受激励不同,动力响应特性较一致激励情况有较大差别。以812m高墩大跨连续刚构桥为例,推导非一致激励下的结构运动方程,运用Midas Civil软件建立数值模拟进行分析,选取模型实测记录的地震波时程数据,考虑行波效应的非一致激励地震动输入。研究成果表明:一致激励和考虑行波效应的顺桥向非一致激励响应效果差别较大,刚构桥各关键节点处的顺桥向位移响应与视波速具有显著相关性;无论波速大小,相对位移峰值明显大于位移峰值差,采用位移峰值差表征不同节点间最大相对位移会低估不同节点间相对位移响应。
When the seismic occurs,the excitation of each supporting of the high pier long-span continuous rigid frame bridge is not the same,and the dynamic response characteristics are different from the same excitation.Taking a 812m high pier long-span continuous rigid frame bridge as an example,this paper attempts to deduce the structural motion equation under the non-uniform excitation,and using Midas Civil software to establish a numerical simulation for analysis.In the model,the measured seismic time history data is selected,considering the non-uniform excitation seismic input of traveling wave effect.The results show that the response results of uniform excitation and non-uniform excitation considering traveling wave effect are quite different,and the displacement response along bridge direction at each key node of rigid frame bridge has a significant correlation with apparent wave velocity,regardless of wave velocity,the peak of relative displacement value is significantly greater than difference of the peak displacement value,the peak displacement difference indicates that the maxum relative displacement between different nodes will underestimate the response of relative displacement between different rigid frame bridges.
作者
蔡卫国
CAI Weiguo(International Affiliates of China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300222,China)
出处
《施工技术》
CAS
2020年第6期84-87,共4页
Construction Technology
基金
国家自然科学基金:柳钢钢渣沥青混合料三维跨尺度水化胀裂行为与协同调控机制(51568007)。
关键词
桥梁工程
刚构桥
时程分析
行波效应
地震位移响应
bridges
rigid frame bridge
time history analysis
traveling wave effect
seismic displacement response
