高层建筑结构-地基动力相互作用效果的振动台试验对比研究

本文通过对高层建筑结构－地基动力相互作用体系和刚性地基上高层建筑结构的振动台模型试验成果的对比分析，研究了相互作用对结构动力特性和地震反应的影响。结果－地基动力相互作用使结构频率减小，阻尼增大；相互作用体系的振型曲线与刚性地基上结构的振型曲线不同，基础处存在平动和转动；在地震动作用下考虑相互作用的结构加速度、层间剪力、弯矩以及应变通常比刚性地基上的情况小，而位移则比刚性地基上的情况大。

Study on effect of soil-structure interaction by shaking table test

Through comparing the shaking table model test results of dynamic interaction system of soil and high-rise structure with those of high-rise structure on fixed base, the effects of Soil-Structure Interaction (SSI) on dynamic characteristics and seismic response are studied in this paper. Due to the effect of SSI, the natural frequency of the system in soft soil condition is lower than that of the structure on fixed base and its damping ratio is larger than that of structure. The mode shapes of system in soft soil condition are notably different from those of the structure on fixed base, and there exist rocking and swing at the foundation in SSI system. When SSI is considered, the seismic responses such as acceleration, shear force, bending moment and strain are commonly less than those of the structure on fixed base, while displacement of SSI system is larger.