巨-子结构控制体系振动台试验与有限元模型对比分析

COMPARATIVE ANALYSIS OF MEGA-SUB CONTROL SYSTEM BY SHAKING TABLE TEST AND FINITE ELEMENT MODELING

为了研究巨-子结构控制体系的抗震性能,该文进行了巨-子结构控制体系的振动台试验研究。试验模型均为钢框架模型且包括三个不同的模型,分别称为抗震结构模型、隔震结构模型和隔震-底层固结模型。采用大型有限元软件SAP2000对试验模型进行了非线性时程分析,并在主结构的加速度、层间位移,子结构的层间位移以及隔震层的变形方面与试验结果进行了对比分析。结果表明:理论分析与试验研究结果吻合较好,且不论是理论计算结果还是试验实测结果,隔震结构以及隔震-底层固结结构相对于抗震结构而言,结构的响应减小明显,说明结构施加隔震装置后能有效减小结构响应,从而保证结构的安全性。

Shaking table test of the mega-sub control system was carried out in order to study the seismic performance of this system. Test specimens were 3 steel frames, called aseismic model, isolated model and isolated-bottom consolidated model, respectively. Nonlinear dynamic time analyses of the test models were performed using SAP2000. Theoretical results were compared with the experimental results on some structural responses including the acceleration response and story drift response of the mega-structure, the story drift response of the substructure, and the deformation of the isolation layer. The results shows that theoretical analysis are in good agreement with the experimental results. The structural responses of the isolated model and isolated-bottom consolidated model are greatly reduced compared with that of the aseismic model, which can be illustrated by both the theoretical results and experimental results. It is concluded that the isolation devices can reduce the structural responses effectively, and make the structure safer than that without isolation devices.