CFRP及钢板复合加固震损方钢管混凝土框架结构抗整体性倒塌能力分析  

Global collapse resistance capacity analysis of earthquake-damaged CFSST frame structure strengthened by CFRP and steel plate

作　　者：许成祥[1] 周星宇 倪铁权 Xu Cheng-xiang;Zhou Xing-yu;Ni Tie-quan(School of Urban Construction,Wuhan University of Science and Technology,Wuhan 430065,China)

机构地区：[1]武汉科技大学城市建设学院,湖北武汉430065

出　　处：《工程抗震与加固改造》2023年第2期1-9,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51178057)。

摘　　要：为了研究CFRP及钢板复合加固震损方钢管混凝土框架结构的抗整体性倒塌能力,基于OpenSees开放平台,通过折减材料的刚度和强度模拟地震损伤,建立3榀分别为未加固、中度损伤加固和重度损伤加固的两跨三层方钢管混凝土框架结构数值模型,对其进行低周往复分析,并通过与试验结果对比验证了模型的可行性。对震损加固前后的结构数值模型进行增量动力分析,绘制出结构倒塌破坏阶段的易损性曲线,通过计算结构抗倒塌安全储备系数来评估其抗整体性倒塌能力。结果表明,未加固构件、中度损伤加固构件和重度损伤加固构件的抗倒塌安全储备系数分别为1.8、2.18、2.07,中度损伤加固构件和重度损伤加固构件的抗整体性倒塌能力较未加固构件分别恢复并得到提升21.1%和15.0%,且满足“大震不倒”要求。因此,CFRP及钢板复合加固可以有效恢复并提高震损方钢管混凝土框架结构的抗整体性倒塌能力。In order to explore the global collapse resistance capacity of CFRP and steel plate composite reinforced concrete-filled square steel tubular frame structure with seismic damage,three-thump two-span three-story concrete-filled square steel tubular frame structural models with reducing the stiffness and strength of the material to simulate the seismic damage are numerically established as unreinforced,moderately damaged reinforced and severely damaged reinforced model,respectively,using the OpenSees open platform,and validated by low-cycle reciprocating analysis comparing with the experimental results.The global collapse resistance capacity of the structure is performed with sequential analysis of incremental dynamic analysis(IDA),the vulnerability curve in the collapse and failure stage,and collapse margin ratios.The results show that collapse margin ratios of unreinforced members,moderately damaged reinforced members and severely damaged reinforced members are 1.8,2.18,2.07,respectively,and the global collapse resistance capacity of moderately damaged reinforced members and severely damaged reinforced members is restored and improved by 21.1%and 15.0%respectively,compared with the unreinforced members which satisfies"not collapsing in a big earthquake".Therefore,the composite reinforcement of CFRP and steel plate is able to effectively restore and improve the global collapse resistance capacity of the earthquake-damaged concrete-filled square steel tubular frame structure.

关 键 词：方钢管混凝土框架 震损加固 CFRP 钢板 抗整体性倒塌能力 

分 类 号：TU3981.2[建筑科学—结构工程]