碳纤维增强复材包裹带脱空缺陷圆钢管混凝土短柱的轴压性能分析  

NUMERICAL ANALYSIS ON AXIAL COMPRESSIVE BEHAVIOR OF CFRP-WRAPPED CIRCULAR CFST STUB COLUMNS WITH INITIAL CONCRETE IMPERFECTION

作　　者：盛鸣宇 王静峰[1,2] 沈奇罕 廖飞宇 SHENG Mingyu;WANG Jingfeng;SHEN Qihan;LIAO Feiyu(School of Civii and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;Collaborative Innovetion Centes of Advenccd Steel Structurs Technology and Industrialization,Hefei 230009,China;College of Transportation and Civit Engineering,Fujian Agriculturs and Forestry University,Fuzhou 350002,China)

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]先进钢结构技术与产业化协同创新中心,合肥230009 [3]福建农林大学交通与土木工程学院,福州350002

出　　处：《工业建筑》2019年第10期10-18,共9页Industrial Construction

基　　金：国家自然科学基金项目(51478158、51178156);教育部新世纪优秀人才支持计划(NCET-12-0838)

摘　　要：为获悉带脱空缺陷圆钢管混凝土柱在碳纤维增强复材(CFRP)包裹下的轴压性能和受力机理,通过建立轴压下CFRP包裹带脱空缺陷圆钢管混凝土短柱的有限元模型,分析了轴压下CFRP分别包裹均匀脱空和球冠形脱空圆钢管混凝土柱的力学性能,讨论CFRP强度、包裹方式和包裹层数等参数对不同脱空形式下构件力学性能的影响,揭示了轴压下CFRP包裹脱空缺陷圆钢管混凝土短柱的受力机理和破坏模式。分析两种脱空形式下构件的典型轴压荷载-轴向位移曲线表明:CFRP包裹带脱空缺陷圆钢管混凝土短柱的变形能力有较高的提升,包裹层数和CFRP材料强度的增加均能明显提高脱空缺陷圆钢管混凝土短柱的轴压承载力。In order to study the performance of concrete filled steel tubular (CFST) stub columns with initial concrete imperfection wrapped in carbon fiber reinforced polymer (CFRP) material under axial compression,a finite element model of CFST with initial concrete imperfection strengthened by CFRP under axial compression was established,the mechanical properties of CFRP-wrapped circular CFST stub columns with circumferential gap and spherical-cap gap concrete imperfection under axial compression were studied. The effects of different CFRP strength,wrapping method and number of wrapping layers on the components with different types of gaps were discussed. The mechanical mechanism and failure mode of CFRP-wrapped circular CFST stub columns with initial concrete imperfection under axial compression were discussed. Typical axial compression versus displacement curves of members with different gaps were analyzed. The research results showed that CFRP could improve the deformability of circular CFST stub columns with initial concrete imperfection. The increase of the number of layers and the strength of the CFRP material could significantly improve the axial bearing capacity of the circular CFST stub columns with initial concrete imperfection.

关 键 词：CFRP 圆钢管混凝土短柱 脱空缺陷 有限元分析 轴压性能 

分 类 号：U41[交通运输工程—道路与铁道工程]