- 摘 要
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（1 河北工業(yè)大學土木與交通學院， 天津 300130； 2 河北省土木工程技術(shù)研究中心， 天津 300401； 3 河北工業(yè)大學建筑與藝術(shù)學院， 天津 300130）
［摘要］對兩榀有無人字形防屈曲約束支撐的異形柱框架進行擬靜力試驗，研究防屈曲約束支撐異形柱框架結(jié)構(gòu)的破壞形態(tài)、滯回特性、承載能力、延性性能、耗能能力等抗震性能指標。結(jié)果表明：人字形防屈曲約束支撐異形柱框架的滯回曲線呈現(xiàn)梭形，無撐異形柱框架的滯回曲線有明顯捏攏現(xiàn)象，人字形防屈曲約束支撐可以使框架各層延性系數(shù)分布更加合理；有撐框架與無撐框架結(jié)構(gòu)相比，有撐框架初始整體剛度提高了53-49%，極限荷載提高了1-50倍，整體極限位移角增大了近3倍。防屈曲約束支撐推遲了梁柱節(jié)點塑性鉸的產(chǎn)生時間，改變了異形柱框架的屈服機制，使結(jié)構(gòu)發(fā)生兩階段屈服，基于此提出了以人字形防屈曲約束支撐達到屈服時作為有撐異形柱框架結(jié)構(gòu)的屈服點，以期更好地反映結(jié)構(gòu)的抗震性能，更符合有撐框架的實際屈服機制。防屈曲約束支撐使異形柱框架結(jié)構(gòu)累積損傷程度減輕，屈服階段至破壞前，組合結(jié)構(gòu)黏滯阻尼系數(shù)基本穩(wěn)定在0-21左右，沒有出現(xiàn)大幅度降低。
［關(guān)鍵詞］防屈曲約束支撐； 異形柱框架結(jié)構(gòu)； 抗震性能； 往復荷載； 屈服機制
中圖分類號：TU375文獻標識碼：A文章編號：1002-848X(2019)16-0112-08
Experimental research of BRBs′ enhancement effect on seismic performance of special-shaped column frame structure
Qiao Jinli1,2, Ding Dong1, Ren Zemin3, Wang Xiaowei1, Meng Qiujie1, Ling Xiaoxiao1
(1 School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300130, China;2 Civil Engineering Technology Research Center of Hebei Province, Tianjin 300401, China;3 School of Architecture and Art, Hebei University of Technology, Tianjin 300130, China)
Abstract:Quasi-static tests were carried out on two special-shaped column frames with unmanned herringbone buckling-restrained braces to study the failure modes, hysteretic characteristics, bearing capacity, ductility and energy dissipation capacity of the special-shaped column frame structures with buckling-restrained braces. The results show that the hysteretic curves of herringbone buckling-restrained braced special-shaped column frames are shuttle-shaped, and the hysteretic curves of non-braced special-shaped column frames are obviously pinched. Herringbone buckling-restrained braces can make the distribution of ductility coefficients of each story more reasonable. Compared with braced frames, the initial overall stiffness of braced frames increases 53-49% and the ultimate load increases 1-50 times, and the overall ultimate displacement angle increases nearly three times. Buckling-restrained braces delay the generation of plastic hinges in beam-column joints, change the yield mechanism of special-shaped column frames, and cause two-stage yielding of structures. Based on this, a new method was proposed that the yielding point of braced special-shaped column frame structures was the herringbone buckling-restrained brace′s yielding point, in order to better reflect the seismic performance of the structures and more in line with the actual yielding mechanism of braced frames. Buckling-restrained braces reduced the cumulative damage of special-shaped column frame structures. From yield stage to failure stage, the viscous damping coefficient of composite structures was basically stable at about 0-21, and there was no significant reduction.
Keywords:buckling-restrained brace(BRB); special-shaped column frame structure; seismic performance; cyclic loading; yield mechanism
*河北省高等學?？茖W技術(shù)研究項目（QN2014119），河北省自然科學基金（E2014202178）。
作者簡介：喬金麗，博士，副教授，碩士生導師，Email:qiaojinli@126.com。
