大跨度门机随机地震响应研究  

Random Seismic Response Research of Long-Span Gantry Crane

作　　者：尹皓[1] 程文明[1] 李丰 

机构地区：[1]西南交通大学机械工程学院,四川成都610031

出　　处：《机械设计与制造》2017年第11期75-78,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金(51175442);四川省应用基础研究计划项目(2013JY0136)

摘　　要：为更好反应地震对门机造成的影响,以大跨度门机为例建立有限元模型。采用多维多点的地震输入方式对大跨度门机进行平稳随机地震分析,分别在行波效应、局部场地效应和相干效应作用下对门机的位移和应力响应规律进行分析比较。计算结果表明:与一致激励相比,行波效应和局部场地效应下的地震激励对门机的最大应力分别增大了8.38%和10.15%;完全不相干效应会使门机的最大应力减少5.58%;由此可得到结论,忽略地震动空间效应会使门机的分析结果有很大的偏差。In order to better perfect the effect of seismic response for gantry crane, The finite element model of large-span gantry crane was appliedin theanalysis, The analysis of long-span gantry crane under the multi-dimensional andmulti-point effect of earthquake motion was investigated. The influence of the local site, traveling wave and coherent on theseismic excitationwere respectively taken into account. The analysis results show that： Compared to the uniform excitation, the maximum stress of gantry crane increase 8.38% and 10.15% when considering the partial area effects and the wave passage effect; The maximum stress of gantry crane reduce 5.58% when considering the coherent effect. Hence, A conclusion can be made that ignoring the spatial variation of ground motion will lead to a great errorfor the analysis results of gantry crane.

关 键 词：门机 随机地震分析 行波效应 局部场地效应 相干效应 

分 类 号：TH16[机械工程—机械制造及自动化] TH21