山区某公路桥抗震分析研究

Study on Seismic Analysis of A Highway Bridge in Mountain Area

文章以某二级公路上一联小箱梁桥为研究对象,建立了全桥动力有限元离散模型,并考虑桩-土动力相互作用,分别建立了E1和E2两种概率水平地震作用下的反应谱分析模型;针对该桥的结构特点以及抗震性能目标,给出了不同构件抗震性能验算指标以及验算方法;根据建立的反应谱分析模型对桥梁各关键构件进行了抗震验算分析,给出设计优化建议,为今后同类型山区桥梁抗震验算提供参考。

With an upper small box girder bridge on a secondary highway as research background,this article established the full-bridge dynamic discrete finite element model, and considering the dynamic interaction between pile and soil, it respectively established the response spectrum analysis model under two kinds of probabilistic horizontal seismic effects of E1 and E2;ragarding the structural characteristics and seismic performance targets of this bridge, it proposed the seismic performance checking indicators and methods for different components; and finally it conducted the seismic checking analysis for every key component of the bridge according to the established response analysis model, and gave the design optimization proposal, thereby providing the reference for seismic checking of the same type of mountain bridge in the future.