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（1 南昌大學(xué)建筑工程學(xué)院, 南昌 330031； 2 華南理工大學(xué)亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室， 廣州 510640）

［摘要］罕遇地震下采用彈性分析所設(shè)計(jì)的偏心支撐框架發(fā)生較大的非彈性變形時(shí)，可能無(wú)法滿足預(yù)期的破壞模式和抗震性能。通過預(yù)先確定結(jié)構(gòu)在非彈性變形下的目標(biāo)位移和屈服機(jī)理，結(jié)合《建筑抗震設(shè)計(jì)規(guī)范》(GB 50010—2010)并考慮消能梁段的耗能折減系數(shù)，提出了偏心支撐框架基于性能的塑性設(shè)計(jì)方法。該方法還采用能量平衡原理和一種側(cè)向力分布方式得到結(jié)構(gòu)的基底剪力和各樓層的剪力，并根據(jù)塑性設(shè)計(jì)法合理設(shè)計(jì)所有構(gòu)件。設(shè)計(jì)某12層偏心支撐鋼框架，采用動(dòng)力彈塑性時(shí)程分析法驗(yàn)正所提出方法的正確性。算例結(jié)果表明：該方法可用于設(shè)計(jì)偏心支撐鋼框架結(jié)構(gòu)，且無(wú)需進(jìn)行復(fù)雜的計(jì)算和迭代，就能使結(jié)構(gòu)滿足多遇及罕遇地震下的預(yù)定功能。

［關(guān)鍵詞］偏心支撐框架； 消能梁段； 基于性能的塑性設(shè)計(jì)； 目標(biāo)側(cè)移； 屈服機(jī)理

中圖分類號(hào)：TU391文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

*國(guó)家自然科學(xué)基金項(xiàng)目(51768044)，江西省博士后科研擇優(yōu)資助項(xiàng)目(2015KY49)，江西省自然科學(xué)基金資助項(xiàng)目(20161BAB216114)。

作者簡(jiǎn)介：胡淑軍，博士，講師，Email：hushujun@ncu.edu.cn。