FRP板修复开裂钢板的应力强度因子影响因素分析  

Influencing factor analysis of stress intensity factor for FRP-strengthened cracked steel plates

作　　者：王海涛 吴刚[2] 张磊[3] WANG Haitao;WU Gang;ZHANG Lei(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Key Laboratory of Concrete and Pre-Stressed Concrete Structure of Ministry of Education,Southeast University,Nanjing 210096,China;Jiangsu Provincial Architectural D&R Institute Ltd.,Nanjing 210019,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [3]江苏省建筑设计研究院有限公司,江苏南京210019

出　　处：《河海大学学报（自然科学版）》2020年第5期440-445,共6页Journal of Hohai University(Natural Sciences)

基　　金：中国博士后科学基金(2019M651675);中央高校基本科研业务费专项(B200202074);东南大学混凝土及预应力混凝土结构教育部重点实验室基金(CPCSME2017-01)。

摘　　要：为系统地了解纤维增强复合材料(FRP)板修复损伤钢构件疲劳裂纹的影响因素,以FRP板修复含中心裂纹的钢板作为研究对象,以裂纹尖端的应力强度因子K作为分析指标,采用有限元方法对FRP板修复开裂钢板的K进行参数分析。结果表明:FRP板截面刚度、宽度和长度的提高能够使K降低,但当FRP板增加到某一长度后,进一步增加长度将基本不影响K;增加胶层剪切模量、降低胶层厚度可以降低K,局部剥离的出现导致K变大;FRP单面修复的K明显大于双面修复,增加FRP板厚度对降低单面修复的K作用不大。To investigate main influencing factors of repair efficacy for the fatigue crack of FRP-repaired damaged steel members,the finite element method was employed to conduct the parametric analyses of the stress intensity factor(K)for FRP-repaired central-cracked steel plate.The results show that the increase of the FRP cross-sectional stiffness,FRP width and FRP length can decrease the factor K.The values of factor K will not change any more when the FRP length exceeds a certain value.The K can be reduced by decreasing the adhesive thickness and increasing the adhesive shear modulus.The local debond leads to an increase of K value.K values of the single-sided repair are much higher than those of the double-sided repair.Moreover,the increase of the FRP thickness in the single-sided repair cannot effectively reduce K values.

关 键 词：纤维增强复合材料(FRP) 损伤钢构件修复 裂纹 钢板 应力强度因子 有限元方法 

分 类 号：TU399[建筑科学—结构工程]