（1 南昌大学建筑工程学院, 南昌 330031； 2 华南理工大学亚热带建筑科学国家重点实验室， 广州 510640）

［摘要］罕遇地震下采用弹性分析所设计的偏心支撑框架发生较大的非弹性变形时，可能无法满足预期的破坏模式和抗震性能。通过预先确定结构在非弹性变形下的目标位移和屈服机理，结合《建筑抗震设计规范》(GB 50010—2010)并考虑消能梁段的耗能折减系数，提出了偏心支撑框架基于性能的塑性设计方法。该方法还采用能量平衡原理和一种侧向力分布方式得到结构的基底剪力和各楼层的剪力，并根据塑性设计法合理设计所有构件。设计某12层偏心支撑钢框架，采用动力弹塑性时程分析法验正所提出方法的正确性。算例结果表明：该方法可用于设计偏心支撑钢框架结构，且无需进行复杂的计算和迭代，就能使结构满足多遇及罕遇地震下的预定功能。

［关键词］偏心支撑框架； 消能梁段； 基于性能的塑性设计； 目标侧移； 屈服机理

中图分类号：TU391文献标识码：A文章编号：1002-848X(2018)17-0111-07

Study of performance-based plastic design method for eccentrically braced steel frames

Hu Shujun1, Song Guquan1, Wang Zhan2

(1 School of Civil Engineering and Architectural, Nanchang University, Nanchang 330031, China; 2 State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China)

Abstract:Under rare earthquakes, eccentrically braced frames (EBFs) designed by current elastic static analysis might experience large inelastic deformations, so the yield mechanisms and seismic performance may not meet the expected requirements. Based on the pre-selected target displacement and yield mechanism during inealstic deformation, Code for seismic design of buildings(GB 50010—2010) and the energy dissipation factor of the links, the performance-based plastic design (PBPD) method of EBFs was proposed. In the proposed method, the base shear and lateral force distribution were derived from modified energy balance equation and a practical lateral force distribution, so all the elements can be obtained by the plastic design method. A 12-story eccentrically braced steel frame was designed to validate the proposed PBPD method by nonlinear dynamic analysis. Numerical analysis results show that this method can be used to design the eccentrically braced steel frames and make them meet expected functions under frequent and rare earthquakes without complicated iteration and calculation.

Keywords:eccentrically braced frames(EBFs); link; performance-based plastic design(PBPD); target lateral displacement; yield mechanism

*国家自然科学基金项目(51768044)，江西省博士后科研择优资助项目(2015KY49)，江西省自然科学基金资助项目(20161BAB216114)。

作者简介：胡淑军，博士，讲师，Email：hushujun@ncu.edu.cn。