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（北京工業(yè)大學(xué)建工學(xué)院  北京 100022）

［提要］  介紹了防屈曲支撐力學(xué)參數(shù)非對(duì)稱現(xiàn)象，研究了考慮這種力學(xué)參數(shù)非對(duì)稱性的恢復(fù)力滯回模型，推導(dǎo)了基于兩種抗震設(shè)防概念的有效阻尼比的計(jì)算公式，以及基于位移的有效阻尼比的計(jì)算公式。適用于用等效靜力法及彈塑性靜力分析法進(jìn)行抗震設(shè)計(jì)。研究了提高結(jié)構(gòu)有效阻尼比的因素以及在結(jié)構(gòu)抗震減震設(shè)計(jì)中應(yīng)注意的問題。就結(jié)構(gòu)抗震減震設(shè)計(jì)、質(zhì)量管理提出了建議。

［關(guān)鍵詞］  防屈曲支撐  有效阻尼比  消能減震  抗震設(shè)計(jì)  力學(xué)非對(duì)稱性

Study on Effective Damping Ratio of Buckling-restrained Brace with Asymmetrically Mechanical Properties/Authors:Gao Xiangyu, Li Yongmei, Zhang Hui, Du Haiyan, Liang Feng(College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100022, China)

Abstract:The usually existed asymmetrical mechanical properties of buckling-restrained brace is introduced and studied. A hysteric resisting force displacement model with considering the asymmetry is developed. The calculation formulas to effective damping ratio suitable for two kinds of seismic reduction considerations, as well as displacement based calculation formulas are studied. Some relative design conceptions to make good use of the braces are discussed and suggested.

Keywords:buckling-restrained brace；effective damping ratio；energy dissipation； seismic mitigation；seismic design

*北京市自然科學(xué)基金資助項(xiàng)目（8062009）；國(guó)家自然科學(xué)基金資助項(xiàng)目（50678013）。