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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。
According to the structural characteristics of Tongtai Bridge in Zhangjiakou, a finite element calculation model of bridge was established by using the common finite element software Midas Civil. The dynamic characteristics and seismic response of bridge considering the influence of boom tension were calculated and compared with the bridge dynamic Features are compared. The results show that the initial stress has little effect on the frequency of Zhangjiakou Tongju Bridge and can be neglected. The structure of the structure is analyzed under the probability level of P1 and P2. The analysis results show that the structure is still elastic under the P1 and P2 probability levels Working stage, it is proved that the bridge has good seismic performance. The results of elastic time history show that vertical seismic excitation has obvious effect on the change of internal force and displacement of structures.