碳纤维增强复材间隔包裹带脱空缺陷圆钢管混凝土短柱的偏压受力性能  

MECHANICAL PROPERTIES OF CIRCULAR CFST STUB COLUMNS WRAPPED BY CFRP AT INTERVALS WITH INITIAL CONCRETE IMPERFECTION UNDER ECCENTRIC COMPRESSION

作　　者：王静峰[1,2] 盛鸣宇 廖飞宇 沈奇罕 WANG Jingfeng;SHENG Mingyu;LIAO Feiyu;SHEN Qihan(School of Civii and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;Collaborative Innovetion Centes of Advenccd Steel Structurs Materials Technology and Industrialization,Hefei 230009,China;College of Transportation and Civil 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1-9,18,共10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：为揭示带脱空缺陷圆钢管混凝土短柱在碳纤维增强复材(CFRP)间隔包裹下的偏压性能和受力机理,通过ABAQUS软件建立了偏压作用下CFRP间隔包裹带脱空缺陷圆钢管混凝土短柱的数值分析模型,对CFRP间隔包裹均匀脱空及球冠形脱空两种截面脱空形式下的圆钢管混凝土偏压短柱进行了系统的参数分析。研究包括偏心率、钢材强度、混凝土强度、径厚比、CFRP强度、CFRP包裹层数、CFRP包裹间距和脱空比等参数对构件偏压性能的影响,分析了偏压下CFRP部分包裹存在脱空缺陷圆钢管混凝土短柱的受力机理和破坏模式。结果表明:CFRP间隔包裹带脱空缺陷圆钢管混凝土短柱在偏压作用下主要破坏模式为钢管局部屈曲、CFRP断裂和混凝土局部压溃;CFRP间隔包裹可较好地提高构件延性,其偏压极限承载力随着材料强度和CFRP包裹层数的增加而提高,随着脱空比、径厚比、偏心率和CFRP包裹间距的提高而降低。In order to reveal the behavior of the circular concrete filled steel tubular (CFST) stub column wrapped by carbon fiber reinforced polymer (CFRP) at intervals with initial concrete imperfection under eccentric compression,a numerical analysis model was established by ABAQUS software. The systematic parameter analysis of the circular CFST stub columns wrapped by CFRP at intervals with circumferential gap and spherical-cap gap concrete imperfection under eccentric compression were studied. It mainly included the effects of parameters such as eccentricity,steel strength,concrete strength,radius-thickness ratio,CFRP layer,number of CFRP layer,and CFRP wrapping spacing and gap ratio the stress mechanism and failure mode of CFRP partially-wrapped CFST with initial concrete imperfection were revealed. The results showed that the main failure modes of CFST stub columns wrapped by CFRP at intervals with initial concrete imperfection ware local buckling of steel tube,CFRP fracture and concrete local crushing. The ductility of the component could be improved by CFRP wrapping at intervals. The ultimate bearing capacity increased with the increase of material strength and CFRP coating layer,and decreased with the increase of gap ratio,diameter-thickness ratio,eccentricity and CFRP wrapping spacing.

关 键 词：CFRP 圆钢管混凝土短柱 脱空缺陷 有限元分析 偏压性能 

分 类 号：TU3[建筑科学—结构工程]