摘要
为了探讨行波效应对刚构-连续组合梁桥结构不同部位响应极值的影响规律,以某48m+5×80m+48m刚构-连续组合梁桥为背景,建立刚性地基和弹性地基2种计算模型,采用大质量法(LMM)求解了一系列相位差条件下结构的非线性地震响应。分析结果表明:对于主跨大于或等于80m的刚构-连续组合梁桥,在抗震设计中必须考虑行波效应的影响,且应重点关注刚构墩的地震响应;在进行行波效应分析时必须根据基岩类型选择恰当的相位差输入,以此来获得结构真实的地震响应;在纵向行波作用下,结构的内力响应峰值和位移响应峰值均随相位差呈周期性变化,其变化周期与结构的特征周期相一致。
To study the law of influence of the traveling wave effect on the response limiting values of different parts of the hybrid bridge structure of rigid-frame and continuous girder, a bridge of the same structural type with span arrangement 48 m＋5×80 m＋48 m was cited as an example. Two kinds of the calculation models for the rigid ground base and elastic ground base were set up and the nonlinear seismic responses of the structure under a series of phase difference conditions were solved and analyzed, using the large mass method. The results of the analysis show that for the hybrid bridge structure of rigid-frame and continuous girder with the main span being greater or equal to 80 m, the influence of the traveling wave effect must be considered in the seismic design and the particular concern should be given to the seismic responses of the rigid piers. In the analysis of the traveling wave effect, the appropriate phase difference input should be selected according to the types of the base rocks so that the true seismic responses of the struc- ture can he acquired. Under the action of the longitudinal traveling waves, the peak values of the internal force and displacement responses of the structure present the periodic changes along with the changes of the phase differences and the periods of the changes are identical with the charac- teristic periods of the structure.
出处
《桥梁建设》
EI
CSCD
北大核心
2012年第6期33-38,共6页
Bridge Construction
基金
国家自然科学基金(50678150
51008250)
新世纪优秀人才支持计划(NCET-10-0701)
国家863计划(2011AA11A103)~~
关键词
刚构-连续梁桥
有限元法
多点激励
行波效应
相位差
rigid-frame and continuous girder bridge
finite element method
multi-support excitation
traveling wave effect
phase difference
