添加耗能装置的大底板多塔楼基础隔震建筑抗震性能研究

Research on Seismic Performance of Multi-tower Structure with a Large Plate Having Energy Dissipation Device

结合实际工程,对大底板多塔楼结构基础隔震建筑在地震作用下的动力特性进行分析研究,提出了混合隔震控制的新型设计方案,建立了大底板多塔楼结构混合隔震控制体系的运动方程,方程中给出各塔楼与隔震层之间的阻尼矩阵,并考虑了地震作用下结构的非线性.通过在上部结构附设粘滞性阻尼器并建立结构的有限元分析模型,可以看到在地震发生时由于所设粘滞阻尼器与隔震层的协同工作,建筑物的地震响应有明显改善.研究中对添加了粘滞阻尼器与叠层橡胶支座相结合的混合控制与单纯基础隔震的减震控制效果加以比较,分析结果表明,这种混合隔震体系可以有效地减小大底板多塔楼结构的地震反应,提高其抗震安全性,取得较好的经济和社会效益.

The dynamic characteristics of base-isolated multi-tower structure with a large plate are studied under the seismic action,for which a new design scheme was suggested.The equation of motion of the hybrid control system is established,and the damping matrix of the super towers,isolation level and substructure are established for better simulating damping of the whole system.The nonlinear behavior of the structure is considered in formulating the bilinear force-deformation relationship.The finite element model built with the on upside structure is analyzed,through which we can find that the viscous dampers have worked coordinately with the base-isolated layer and the stress state of structure is improved obviously under seismic action.In this study,the anti-seismic performance of the structure with nonlinear viscous dampers and laminated rubber bearings were compared with the only base-isolated structure.The results show that the hybrid control scheme has been very effective in reducing seismic responses of both superstructure and substructure simultaneously,and the anti-seismic behavior of the whole structure system is obviously improved.