混合结构抗震性能研究进展及展望

New Progress and Research Prospect on Seismic Behavior of Hybrid Structures

混合结构试验研究一般针对具体工程,研究佐证不充分且缺乏共性,为掌握混合结构抗震性能,指导高层结构设计,结合同济大学土木工程防灾国家重点实验室近5年来开展的混合结构及其受力构件研究,总结出地震力作用下混合结构受力特点及破坏规律,验证三水准、两阶段设防目标下结构的可靠性。通过试验分析提出该结构抗震性能新认识,即外节点上、下应力集中导致框柱先于筒体开裂,成为第一道抗震防线,内节点构造与计算模型的差别会引起计算结果失真。对竖向混合结构特点及发展现状进行分析,指出开展该结构体系抗震性能研究的关键问题,即节点构造及模型化和结构动力参数的确定,进而提出了该领域系统研究的思路和方法。

In order to investigate the seismic behavior of hybrid structures and guide design of high - rise buildings, the research projects on shake table tests of global structure and pseudo static tests of relevant member were generalized which were conducted in State Key Laboratory for Disaster Reduction in Civil Engineering of Tongji University in recent 5 years. It concluded the mechanical characteristics and failure mechanism and validated the seismic behavior of hybrid structures in the light of seismic fortification objective, The new opinion on the seismic behavior of hybrid structures was presented based on experimental analysis. The exterior columns crack before core walls for the stress concentration on the top and the bottom section of exterior joints and turn to the first line of defense consequently. The detailing of interior joints which is inconsistent with analysis model will lead to distortion. Based on a discussion on status of vertical hybrid structures, the key issues for seismic behavior were pointed out. That included the detailing and relevant restoring force models for connections and dynamic parameters for global structure as well. Finally, the following research route in this field was proposed.