【摘要】 根据张家口通泰大桥的结构特点,利用通用有限元软件Midas Civil建立了桥梁空间有限元计算模型,计算了该桥考虑吊杆张力影响的动力特性和地震响应,并与不计吊杆张力影响的桥梁动力特性进行了比较。计算结果表明,初应力对张家口通态大桥的频率影响不大,可以忽略;并对结构进行了P1、P2概率水准下的反应谱分析,分析结果表明,P1、P2概率水准下结构仍处于弹性工作阶段,证明了该桥具有良好的抗震性能;弹性时程分析结果显示了竖向地震激励对于结构内力和位移的变化具有明显的作用。更多还原

【Abstract】 A three-dimension finite element model is established by Midas Civil in terms of the structure characteristics of Tongtai Bridge in Zhangjiakou,dynamic characteristics and the seismic responses are analyzed and compared under hanger strain or not.The results show that the hanger strain has little effect on the natural frequency,can be ignored;The results of spectrum analysis under P1 and P2 probability level show that structure has good aseismic performance and still in elastic working stage;The vertical earthquake motion has obvious effect on structure force and displacement,which is proved by elastic time-history analysis result.更多还原