SSI体系框筒结构高层建筑地震能量响应

Seismic energy response of a high-rise building with frame-core tube structure considering soil-structure interactions

摘要:

为研究土体-结构动力相互作用（SSI, soil-structure interaction）体系高层建筑结构地震能量响应,选用某框筒结构高层建筑研究模拟对象,结合动力相似Buckingham π定理和强度、刚度等效原则,设计了固定基础（FB, fix-based）和SSI两种体系振动台试验模型.研究了振动台试验原始数据预处理方法、多自由度体系能量方程以及试验模型上部结构参数矩阵计算方法.通过对比不同烈度模拟地震作用下,FB和SSI试验模型上部结构的动能、弹性应变能、阻尼耗能、滞回耗能以及土体耗能差异,分析了土体对上部结构动力特性和能量响应的影响.研究结果表明,相同地震波作用下,SSI体系上部结构各项能量响应均小于FB体系.土体阻尼耗能率随地震烈度的增大而减小.土体能够改变上部结构的动力特性和能量响应程度,但无法改变能量响应沿楼层高度的分布趋势.

Abstract:

To investigate the seismic energy response of a high-rise building considering the effect of soil-structure interaction (SSI) under seismic excitation, two shaking table test models, a fix-based (FB) model and a SSI model, were designed for simulating the high-rise building with frame-core tube structure based on the Buckingham π theorem and the principle of equivalent bending stiffness and strength. The original test data preprocessing method, energy equation of multi-degree-of-freedom system, and calculation method of the parameter matrix of the test model structure were explored in this study. Soil Effects on the dynamic characteristics and energy response of the superstructure of the two models were analyzed by comparing the kinetic energy, elastic strain energy, damping and hysteretic energy dissipation of soil under simulated seismic ground motions with different intensities. The results show that the energy response of the superstructure of the SSI test model was smaller than that of the FB model. The ratio of the soil damping of energy dissipation decreased with the increase of the seismic intensity. The soil could change the dynamic characteristics and energy response of the superstructure, but not the distribution trend of the energy response along the superstructure.