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强震发生时由于受行波效应、部分相干效应和局部场地效应等因素的影响,大跨度桥梁地面各支承处所受激励并不相同,按多点激励的模式进行地震反应分析较为合理。本文对天津市快速轨道交通工程中1座4跨预应力混凝土连续刚构桥进行了多点激励地震反应分析,并与一致激励下动力时程分析的计算结果进行了比较,对该4跨预应力混凝土连续刚构桥的工程建设具有直接的指导意义。
Due to the influence of traveling wave effect, partial coherence effect and local site effect, the excitation of long-span bridge ground supports is not the same when strong earthquakes occur. It is reasonable to analyze the seismic response according to multi-point excitation mode. In this paper, the seismic response analysis of a 4-span prestressed concrete continuous rigid frame bridge in Tianjin rapid rail transit project is carried out and compared with the results obtained by the consistent excitation of dynamic time history analysis. The construction of continuous rigid frame bridge with stress concrete has a direct guiding significance.