侧向冲击下CFRP缠绕加固RC悬臂柱动态响应的有限元分析  

Finite element analysis of dynamic response of cantilever CFRP-wrapped RC columns subjected to lateral impact loading

作　　者：刘涛 马健超 陈林[1] 徐金俊 杨勇 LIU Tao;MA Jianchao;CHEN Lin;XU Jinjun;YANG Yong(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;Poly Changda Engineering Co.,Ltd.,Guangzhou 510620,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]南京工业大学土木工程学院,江苏南京211816 [3]保利长大工程有限公司,广东广州510620

出　　处：《自然灾害学报》2023年第1期139-149,共11页Journal of Natural Disasters

基　　金：湖南省自然科学基金项目(2020JJ5177);湖南省教育厅科学研究项目(21B0470,21A0293);国家自然科学基金项目(52278500)。

摘　　要：文中基于LS-DYNA软件对侧向冲击下碳纤维增强复合材料(CFRP)缠绕加固钢筋混凝土(RC)悬臂柱进行了有限元模拟,在与文献试验结果对比验证基础上开展了参数化分析,重点考察了柱轴压比、CFRP层数、冲击速度及冲击质量等参数对柱动态响应的影响规律。研究结果表明:(1)低轴压比0~0.2对CFRP加固柱的损伤形态、冲击力第一峰值和侧向位移的影响较小;(2)增加CFRP层数可减小RC柱的剪切损伤程度和侧向位移;(3)相比冲击质量,冲击速度对CFRP加固柱的冲击力第一峰值和侧向位移的影响更大;(4)在相同冲击能量下,增加冲击质量会引起侧向位移的增加与冲击力第一峰值的下降。This paper established finite element models of cantilever reinforced concrete(RC)columns wrapped with carbon fiber reinforced composites(CFRP)under lateral impact loading by using a LS-DYNA software.Numerical results were compared with experimental results obtained from the literature to validate the rationality of the modeling method.A series of parametric analysis were conducted to study the effects of column axial compression ratio,the number of CFRP wraps,impact velocity and impact mass on dynamic responses of strengthened RC columns.The results show that:(1)The column axial compression ratio from 0 to 0.2 has little effect on damage pattern,the first peak of impact force and lateral displacement of CFRP-wrapped RC columns.(2)The number of CFRP wraps can effectively control the shear damage and reduce the lateral displacement.(3)The impact velocity has a greater influence on the first peak of impact force and lateral displacement of strengthened columns than impact mass.(4)Under the same impact energy,increasing impact mass will increase the lateral displacement but reduce the first peak of impact force.

关 键 词：CFRP 钢筋混凝土柱 冲击 动态响应 有限元 LS-DYNA 

分 类 号：TU37[建筑科学—结构工程]