基于三维隔震的巨子结构多维地震反应分析

为解决高层结构三维隔震的难题，针对一种巨子结构和基于子结构三维隔震的巨子结构进行振动台试验和三维地震作用下的数值分析。首先介绍了巨子结构的原型结构、缩尺模型结构和振动台试验方案。随后进行了模型结构振动台试验，测量和分析了结构的地震响应，并与数值分析结果进行了对比。最后对原型结构进行了三维地震作用下的地震反应数值分析。试验及数值分析结果表明：在子框架底部设置三维隔震支座不同于基础隔震的形式和减震机理，但仍延长了整个结构的水平和竖向自振周期。数值分析结果与试验结果吻合较好，误差较小。隔震子框架对各类场地地震动作用下的主框架三维地震响应具有明显的调谐减震作用。三维隔震支座对各类场地地震动作用下的子框架三维地震响应具有显著的隔震作用。罕遇地震作用下的隔震层位移反应没有超过隔震缝宽，子框架不会与主框架发生碰撞。

Multi-dimensional seismic response analysis of three-dimensional seismic-isolation mega-sub structure

To solve the difficulty in 3D seismic isolation of high-rise structure, shaking table tests and numerical simulations under multi-dimensional excitation of an aseismic mega-sub structure and a mega-sub structure based on three-dimensional seismic isolation of sub structure were performed. Firstly, prototype structure, model structure and shaking table test scheme were introduced. Then, shaking table tests of two model structures were carried out, the structural seismic responses were measured and analyzed, and furthermore, test results were compared with numerical simulation results. Finally, the multi-dimensional seismic response analyses on the prototype structure were conducted. Experimental results and simulation results show that the natural vibration periods of structure in horizontal and vertical directions are prolonged, although the three-dimensional seismic-isolation bearings arranged beneath the base of sub structure are different from those seismic isolations from the perspectives of seismic-isolation forms and damping mechanism. Simulation results agree well with test results. Seismic-isolation sub structure has remarkable damping effect on the seismic response of main structure under different ground motions. Three-dimensional seismic-isolation bearing also has isolation effect on the multi-dimensional seismic responses of sub structure. If displacement responses of seismic-isolation layers do not exceed the width of seismic-isolation joint, sub structures shall not collide with the main structure.