自复位支撑结构设计屈服点确定方法研究

Research on the method of determining the yield point in the design of self-centering braced structures

摘要:

确定结构设计屈服点是建立等延性弹塑性位移反应谱的关键问题，笔者提出一种自复位支撑结构设计屈服点确定方法。采用直接基于位移的设计方法设计了三层和五层自复位防屈曲支撑钢框架结构，分析设计屈服点对直接基于位移设计方法的精度和设计结果影响规律。研究结果表明，对于低层和多层结构，采用笔者所提出的屈服点确定方法进行直接基于位移的抗震设计时，结构延性能力能够满足延性设计需求；相比于传统的设计屈服点确定方法，在8度大震下结构最大层间位移角更接近2%的设计目标，降低了自复位防屈曲支撑的第一刚度设计值，设计的结构在满足安全性的同时具有更好的经济性。

Abstract:

Determining the yield point of structural design is the key problem to establish the equal ductility elastic-plastic displacement response spectrum. A method for determining the design yield point of self-centering braced structures is proposed in this paper. Three-story and five-story steel frame structures with self-centering buckling-restrained braces are designed by using the direct displacement-based design method, and the influence of the design yield point on the accuracy and design results of the direct displacement-based design method is analyzed. The research results show that for low-rise and multi-story structures, when the yield point determination method proposed by the author is used for direct displacement-based seismic design, the ductility capacity of the structure can meet the requirements of ductility design; Compared with the traditional design yield point determination method, the maximum interstory displacement angle of the structure under 8-degree earthquake is closer to the design goal of 2%, and the first stiffness design value of self-reset anti-buckling brace is reduced. the designed structure not only meets the safety, but also has better economy.