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在地震工程研究中同时考虑局部地形效应和土与结构动力相互作用对结构动力响应的影响是一个困难的问题。该文基于多源粘弹性人工边界理论,利用通用有限元程序ANSYS建立了一种可以同时考虑地震波入射角度、土与结构动力相互作用及局部地形效应等因素影响的有限元分析模型。利用这一模型对一座5跨连续梁桥进行了动力响应分析,结果表明:结构内力随着地震波入射角度的变化而变化;地形效应的影响使桥梁结构局部存在内力放大效应;不考虑土-结构动力相互作用有可能较小的估计结构的内力;同时土的物理性质对土-结构动力相互作用也有一定的影响。
It is a difficult problem to consider both the effect of local topography and the dynamic interaction between soil and structure on the dynamic response of structures in seismic engineering. Based on the multi-source viscoelastic artificial boundary theory, a finite element analysis model based on the general finite element program ANSYS is established, which can consider both the incident angle of seismic waves, the dynamic interaction between soil and structure and the local topographic effects. The dynamic response of a 5-span continuous girder bridge is analyzed by this model. The results show that the internal force of the structure changes with the incident angle of the seismic wave. The effect of topographical effect causes the internal force amplification of the bridge structure locally. Without consideration of the soil-structure Dynamic interaction may be less likely to estimate the internal forces of the structure; at the same time, the physical properties of the soil have a certain influence on the soil-structure dynamic interaction.