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选择高效且易实现的分析方法是实现大跨度结构多点随机地震反应分析的关键步骤之一。首先,对两种改进的虚拟激励法(即直接位移求解法和大质量法)做了简要比较;然后,通过对ANSYS程序的二次开发,实现了直接位移求解法和大质量法的通用有限元计算,进行了这两种改进虚拟激励法的数值精度比较。在此基础上,选择高精度的直接位移求解的虚拟激励法,以能较好模拟长周期地震动特性的杜修力陈厚群功率谱模型作为输入,对某悬索桥结构进行了多点随机地震反应分析,探讨了大跨度结构的响应峰值随地面视波速变化、以及行波效应对结构不同部位反应的影响。
Choosing an efficient and easy-to-implement analytical method is one of the key steps to realize the multi-point random seismic response analysis of long-span structures. First of all, a brief comparison is made between the two improved virtual stimulus methods (ie, the direct displacement method and the mass method). Then, through the secondary development of the ANSYS program, the universal finite solution of the direct displacement method and the large-mass method Meta-calculation, the two improved virtual excitation method of numerical accuracy comparison. On the basis of this, a high-precision virtual excitation method for solving direct displacement is selected, and the multi-point random seismic response analysis of a suspension bridge structure is carried out based on the power spectrum model of Du Xiu-Li Chen Houqun that can simulate long-period ground motion characteristics well. The response of the long-span structure to the peak value of the apparent velocity changes with the ground, and the influence of the traveling wave effect on the response of different parts of the structure.