基于能力设计原理的罕遇地震作用下转换层结构设计研究

Design and research of transfer-storey structures based on philosophy of capacity design under severe earthquake

本文将基于能力的设计原理引入转换层结构设计,提出了“强转换弱上部”思想,给出了转换构件的能力设计公式。考虑了转换结构刚度和质量变化以及抗震设防烈度和转换层设置高度的不同对转换结构所受罕遇地震作用的影响,从工程应用的角度给出适用各类转换形式的能力设计简化公式,给出转换层结构能力设计的具体步骤。通过工程算例,对运用能力设计方法、我国现行规范方法以及在工程界应用的水平地震作用增大系数法(G+βE)进行对比,并对转换层结构的能力设计方法应用提出了建议。

The philosophy of capacity design is introduced into the design of transfer-storey structures in this paper. The theory of strong transfer and weak upper structure is put forward, and then the capacity design formulas of transfer structures are derived. Firstly, a series of nonlinear dynamic time-history analysis has been finished, which considers the influence of varied parameters such as the stiffness and mass of transfer structures, seismic fortification intensity and the position of transfer storey on the dynamic behavior of transfer structures under severe earthquake. And then, the simplified formulas and the detail procedure for capacity design of transfer structures are presented. Based on a tall building structural analysis, the results are compared among the three methods of the codes, the enlarged coefficient of horizontal earthquake action used in practical engineering design （ G ＋βE） and the capacity design herein. At last, some design advices are given.