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本文采用土与结构相互作用的计算模型分析了长大桥梁结构的竖向地震反应。在相互作用的计算中,利用圆心位移影响函数法求得地基的动态复刚度,采用子结构技术建立结构的动态方程,通过快速傅立叶变换在频域上求解。将计算结果与刚性地基计算模型的计算结果以及同时同位相输入的计算结果比较表明:长大桥梁应采用土与结构相互作用计算模型,按多点输入计算,并进行竖向反应分析。
In this paper, the vertical seismic response of long and big bridge structures is analyzed using the computational model of the interaction between soil and structure. In the calculation of the interaction, the dynamic complex stiffness of the foundation is calculated by using the function of center-circle displacement influence. The dynamic equation of the structure is established by the substructure technique and solved in the frequency domain by the Fast Fourier Transform. Comparing the calculated results with the calculated results of the rigid foundation calculation model and the simultaneous input of the same phase shows that the model of interaction between soil and structure should be adopted for the long and large bridges, and the calculation should be based on multi-point input and the vertical response analysis should be carried out.