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为了研究空间变化地震作用下钢管混凝土拱桥的抗震性能,以一座钢管混凝土拱桥的实际工程为例,采用虚拟激励法对此拱桥在空间变化地震作用下的抗震性能进行了系统的理论分析。提出了考虑非一致土层分布条件下的空间三维地震动的合成方法,在综合考虑地震动的多维性、不相干效应、行波效应,特别是一致和非一致土层分布条件下局部场地效应的基础上,对钢管混凝土拱桥进行了多维多点随机振动分析。研究结果表明:场地效应会对结构产生显著的影响,软土场地会导致结构产生较大的响应,同时非一致的土层分布也会对结构响应产生不可忽略的影响;地震动的多维性,特别是竖向地震激励会对拱桥结构响应产生较大影响;在抗震分析中应考虑这些因素的影响,以免错误的估计结构的响应。
In order to study the seismic behavior of concrete-filled steel tube arch bridges under space-varying seismic effects, taking a concrete-filled CFST arch bridge as an example, a virtual excitation method is used to analyze the seismic behavior of the arch bridge under the spatial variation of earthquake. The synthetic method considering the three-dimensional ground motion under the condition of non-uniform soil distribution is proposed. After considering the multidimensional and incoherent effects of ground motion, the traveling wave effect, especially the local site effect under the uniform and inconsistent soil layers Based on the multi-dimensional multi-point random vibration analysis of CFST arch bridge. The results show that: the site effect will have a significant impact on the structure, the soft soil site will lead to a greater response to the structure, while the non-uniform soil distribution will have a non-negligible impact on the structural response; the multidimensional, In particular, the vertical seismic excitation will have a greater impact on the structural response of the arch bridge; the influence of these factors should be considered in the seismic analysis so as to avoid erroneously estimating the response of the structure.