加固后钢筋混凝土框架结构抗震性能试验研究  

EXPERIMENTAL RESEARCH ON SEISMIC PERFORMANCE OF STRENGTHENED REINFORCED CONCRETE FRAME STRUCTURES

作　　者：邵剑文 任晓阁 龚顺风[2] 肖志斌 SHAO Jianwen;REN Xiaoge;GONG Shunfeng;XIAO Zhibin(The Architectural Design&Research Institute of Zhejiang University Co.,Ltd.,Hangzhou 310028,China;Department of Civil Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学建筑设计研究院有限公司,杭州310028 [2]浙江大学土木工程系,杭州310058

出　　处：《工业建筑》2019年第10期92-98,122,共8页Industrial Construction

基　　金：浙江省重点研发计划项目(2018C03033-1);国家自然科学基金资助项目(51779223,51479176,51009122)

摘　　要：为研究不同加固方式对混凝土框架结构抗震性能的影响,通过对6榀采用钢支撑和剪力墙加固的单层、单榀混凝土框架试件进行低周反复荷载试验,对比分析不同加固方式下框架结构的水平极限承载力、累积滞回耗能、变形能力和破坏方式等抗震性能。结果表明:采用弱钢支撑加固的混凝土框架试件水平极限承载力和初始抗侧刚度得到一定程度的提高,其水平承载力达到峰值后缓慢下降,试件具有良好的变形能力和耗能能力;采用强钢支撑和混凝土剪力墙加固的混凝土框架试件水平极限承载力和初始抗侧刚度均得到较大程度的提高,由于剪力墙以及强钢支撑加固试件的外框架发生破坏,水平承载力达到峰值后迅速下降,试件变形能力和耗能能力较弱。因此采用强钢支撑加固混凝土框架时,应同时对框架构件进行加固以避免水平荷载作用下构件先于支撑发生破坏,加固后结构不仅具有较高的水平极限承载力和初始抗侧刚度,也具有较好的耗能和变形能力。In order to study the influence of different strengthening strategies on the seismic performance of existing reinforced concrete(RC)frame structures,the quasi-static loading tests of 6 one-story one-bay frame specimens retrofitted with steel bracings and concrete shear wall were carried out,and the seismic performance of the frame structures using different strengthening strategies were conparatively analyzed from the aspects of horizontal ultimate beasing capacity,hysteretic energy dissipation,deformation capacity and failure mode.The results indicated that the ultimate bearing capacity and the initial lateral stiffness of the frame-specimens retrofitted with weaker steel bracings were improved partly,the bearing capacity declined gradually after reaching the peak load,the frame specimens exhibit preferable energy dissipation and deformation capacity.The ultimate bearing capacity and initial lateral stiffness of the frame specimens retrofitted with strong steel bracings and concrete shear wall were improved remarkably,the bearing capacity declined rapidly after reaching the peak load due to the failure of the RC frame structures,and the frame specimens exhibited poor energy dissipation and deformation capacity.Thus,when the RC frame structures were retrofitted with strong steel bracings,the components should be strengthened properly to prevent from premature failure under the horizontal loads,so that the strengthened frame structures not only had high horizontal ultimate bearing capacity and initial lateral stiffness,but also had good energy dissipation and deformation capacity.

关 键 词：钢筋混凝土 框架结构 加固方式 低周反复荷载试验 抗震性能 

分 类 号：TU3[建筑科学—结构工程]