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（1 長(zhǎng)安大學(xué)建筑工程學(xué)院， 西安 710061； 2 陜西省建筑科學(xué)研究院， 西安 710082）

［摘要］底部框架-抗震墻砌體結(jié)構(gòu)（底框結(jié)構(gòu)）底層鋼筋混凝土框架與上部砌體墻之間剛度差異較大，底層鋼筋混凝土框架在地震中易發(fā)生破壞。針對(duì)底框結(jié)構(gòu)抗震性能較差的缺點(diǎn)，采用屈曲約束支撐對(duì)某幢底框結(jié)構(gòu)房屋進(jìn)行抗震加固，建立設(shè)置屈曲約束支撐的底框結(jié)構(gòu)計(jì)算模型，應(yīng)用反應(yīng)譜及時(shí)程分析方法對(duì)該結(jié)構(gòu)進(jìn)行計(jì)算分析。結(jié)果表明，設(shè)置屈曲約束支撐能夠有效減小底框結(jié)構(gòu)剛度差異，降低結(jié)構(gòu)地震響應(yīng)，提高底框結(jié)構(gòu)抗震性能；采用屈曲約束支撐加固方案具有施工簡(jiǎn)單、周期短等優(yōu)點(diǎn)，可供底框結(jié)構(gòu)抗震加固時(shí)參考使用。

［關(guān)鍵詞］底部框架-抗震墻砌體結(jié)構(gòu)； 屈曲約束支撐； 反應(yīng)譜分析； 時(shí)程分析

中圖分類號(hào)：TU398+.5文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)08-0023-06

Application study of buckling restrained braces in seismic strengthening of multi-story masonry buildings with RC frames on ground floors

Bai Liang1， Wang Zengbao1， Zhang Tao2， Xie Pengfei1

（1 School of Civil Engineering, Chang′an University, Xi′an 710061, China；

2 Shaanxi Provincial Academy of Building Research, Xi′an 710082, China）

Abstract:For multi-story masonry buildings with RC frames on ground floors (bottom frame structure), the stiffness difference between the bottom reinforced concrete frame and the upper masonry wall is great, so the bottom reinforced concrete frame is prone to damage in the earthquake. In view of the poor seismic performance of the bottom frame structure, buckling restrained braces were used for seismic strengthening of a bottom frame structure. The calculation model of the bottom frame structure with buckling restrained braces was established, and this structure was calculated and analyzed by using the response spectrum and time-history analysis methods. The result shows that setting the buckling restrained braces can effectively reduce stiffness difference in bottom frame structure, reduce the seismic response of the structure and improve seismic performance of bottom frame structure. Buckling restrained brace reinforcement scheme has the advantages of simple construction and short period, which can be used for reference in the seismic strengthening of bottom frame structure.

Keywords:multi-story masonry buildings with RC frames on ground floor; buckling restrained brace; response spectrum analysis; time-procedure analysis

*國(guó)家自然科學(xué)基金資助項(xiàng)目（51208058），中國(guó)博士后科學(xué)基金特別資助項(xiàng)目(2012T50790)，陜西省自然科學(xué)基金資助項(xiàng)目（2014JM7294），陜西省協(xié)同創(chuàng)新計(jì)劃項(xiàng)目（2015XT-38）。

作者簡(jiǎn)介：白亮，副教授，碩士生導(dǎo)師，Email:bailiang2000@aliyun.com。