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以兰州市某3跨连续下承式钢管混凝土系杆拱桥为例,选用经过幅值调整的天津波、Taft波和EL-Centro地震波3种加速度时程曲线,对拱桥空间有限元模型进行一致激励、行波激励下的地震时程响应分析。研究了激励输入模式、不同地震波、波速、非线性、波的输入方向等因素对地震响应的影响规律。结果表明:在地震激励下,边跨的关键点也可能成为大跨连续拱桥的控制点,在工程设计中应引起重视。在不同地震激励模式作用下地震响应差别很大,尤其是行波效应可以改善固定墩受力,因此考虑三维地震、行波激励更为合理。
Taking a 3-span continuous CFST arch bridge in Lanzhou City as an example, the time-history curves of Tianjin wave, Taft wave and EL-Centro seismic wave with amplitude adjustment are chosen to uniformly stimulate the spatial finite element model of arch bridge Time-history analysis of seismic response under traveling wave excitation. The effects of input modes, different seismic waves, wave velocities, nonlinearities, input directions of waves and so on on the seismic response are studied. The results show that under seismic excitation, the key points of the side span may also become the control points of the long span continuous arch bridge, which should be paid more attention in engineering design. Under different seismic excitation modes, the seismic response varies greatly. Especially the traveling wave effect can improve the force of fixed piers. Therefore, it is more reasonable to consider 3D seismic and traveling wave excitation.