摘要
为了研究震损装配式型钢混凝土框架加固修复后的抗震性能和损伤过程,对2榀震损后装配式型钢混凝土框架梁端进行高强钢丝布加固,柱底进行斜支撑或外包钢加固的复合加固,并对其进行低周往复试验。观察了框架结构的破坏形态,对比分析了加固前后各框架结构的荷载-位移滞回曲线、骨架曲线、刚度退化、能量耗散、承载力退化以及层间位移角等抗震性能;建立了适用于装配式型钢混凝土框架的累积耗能损伤评估模型。结果表明:加固后框架结构的破坏形态主要表现为高强灌浆料破碎剥落,斜支撑以及外包钢发生屈曲,其滞回曲线呈饱满的梭形,斜支撑和外包钢两种加固形式下峰值荷载分别提高了28.3%和30.1%;柱底采用斜支撑和外包钢加固的结构刚度和耗能能力均得到显著提升,最大提高幅度分别为45.8%和41.8%;加固后结构的承载力退化趋势表现为先增大后减小的趋势;加固后结构的极限层间位移角介于3/98~3/97之间,具有较强的抗倒塌能力。提出了适用于装配式型钢混凝土框架的累积耗能损伤评估模型,计算结果与试验结果吻合良好。
To investigate the seismic performance and damage process of the earthquake-damaged prefabricated steel-reinforced concrete frame after reinforcement and repair,the beam ends of two earthquake-damaged prefabricated steel-reinforced concrete frames were reinforced with high-strength steel wire mesh,and the column bases were strengthened with inclined braces or steel-encased composite reinforcement.Low-cycle reversed cyclic tests were then conducted on these frames.The failure modes of the specimens were observed,and the seismic performance such as load-displacement hysteresis curve,skeleton curve,stiffness degradation,energy dissipation,strength degradation and inter-story displacement angle of each specimen before and after reinforcement were compared and analyzed.Finally,a cumulative energy dissipation damage assessment model suitable for prefabricated steel reinforced concrete frames was established.The results show that the failure modes of strengthened specimens are mainly characterized by crushing and spalling of high-strength grouting material,buckling of inclined support and outer steel.The hysteresis curve is full fusiform;the peak loads of frames with two reinforcement forms of inclined support and outer steel increased by 28.3% and 30.1%,respectively.Both specimens showed significant improvements in stiffness and energy dissipation capacity,with maximum increases of 45.8% and 41.8%,respectively.The strength degradation of both specimens showed a trend of increasing first and then decreasing.The ultimate inter-story displacement angles of the specimens are between 3/98 and 3/97,indicating strong collapse resistance.The cumulative energy dissipation-based damage assessment model for prefabricated steel reinforced concrete frames was proposed,and the calculation results were in good agreement with the experimental results.
作者
陈宇良
王双翼
朱真
叶培欢
陈宗平
CHEN Yuliang;WANG Shuangyi;ZHU Zhen;YE Peihuan;CHEN Zongping(School of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Engineering Research Center for Safety Prevention and Control of Assembly Structure,Guangxi University of Science and Technology,Liuzhou 545006,China;Key Laboratory of Disaster Prevention&Mitigation and Prestress Technology of Guangxi Colleges and Universities,Guangxi University of Science and Technology,Liuzhou 545006,China;Key Laboratory of Engineering Disaster Prevention and Structural Safety,Ministry of Education,Guangxi University,Nanning 530004,China)
出处
《建筑结构学报》
北大核心
2025年第9期44-57,共14页
Journal of Building Structures
基金
国家自然科学基金项目(52368013,51908141)
广西重点研发计划项目(桂科AB23075196)
中国博士后科学基金(2021M693854)。
关键词
震损装配式型钢混凝土框架
高强钢丝布加固
斜支撑加固
外包钢加固
拟静力试验
抗震性能
损伤模型
earthquake-damaged prefabricated steel reinforced concrete frame
high-strength steel wire mesh reinforcement
inclined support reinforcement
wrapped steel reinforcement
quasi-static test
seismic performance
damage model
