神水泉大桥非线性时程分析及抗震性能评价

Nonlinear time history analysis and seismic behavior estimation of Shenshuiquan Great Bridge

结合某高速公路一座典型桥梁神水泉大桥的工程设计实例,采用有限元分析程序Midas Civil,选取空间梁单元建立动力计算模型。采用非线性时程法分析该桥受E2地震作用在顺桥及横桥向产生的动力反应,同时按反应谱法进行校核,并对桥墩进行了抗震性能评价。时程分析分别采用3组实际强震记录的时程曲线,计算结果取时程法的包络值。由分析结果可知E2地震作用下按能力保护构件设计的盖梁抗弯强度、桩基抗弯强度及支座厚度不满足要求;矮墩抗剪能力不满足E2地震作用要求。

Combined with actual engineering design example of a typical bridge in an expressway - Shenshuiquan Great Bridge,we used the finite element analysis program Midas Civil and selecled 3 - D beam element to estob- lished a dynamic calculation model. The nonlinear time -history was used to analyze the dynamic response of the bridge in longitudinal and trasverse directions unde E2 earthquake action At the same time, the results are checked by response spectrum method. And the seismic performance of the brideg piers are evaluated Three actualstrong motion records were selected in nonlinear time -history analysis and their enveloping curve was used in calculation. The results show that the bending strength of cap beam and pile according to capacity protected member so not satisfy the requirements for earthquake action E2. It is also found that the thickness of abutments and shear strength of squat pier not meet the requirements for earthquake action E2.