考虑地基与建筑结构相互作用的动态分析

对旋转-摆动多质点系振动模型建立振动微分方程以后,根据时程分析法原理编写电算分析程序,结合算例讨论了是否考虑地基与建筑结构相互作用时对结构地震响应的影响问题,通过对两个模型进行对比、分析,得到了一些有益结果。结果表明,地基和建筑结构的共同作用相当于一种能量消耗器,能够消耗一部分地震能量,起到减少上部结构吸收大量地震动输入能量的作用。利用此模型可以在一定程度上把握其影响,可为抗震设计人员和工程技术人员提供参考。

Dynamic Analysis of Buildings Considering Interaction between Foundation and Super-structure

A computer program based on the time history analysis is compiled after deducing the differential equation of the multimass rotation-swing vibration model.Combined with an example,the influence of the interaction between the foundation and the super-structure on the structural response under earthquake is discussed.Through the contrast of two models,some valuable results are obtained.Results indicate that the interaction of the foundation and the super-structure is similar to the energy consumer,which can dissipate partially the earthquake energy and reduce the energy absorpted by the superstructureion during seismic motion.By using this model the influence can be grasped to a certain extent.The method can be referenced to the engineer in the anti-earthquake design.