CFRP加固含腐蚀缺陷圆钢管混凝土短柱轴压承载力试验研究  

EXPERIMENTAL STUDY ON AXIAL COMPRESSIVE CAPACITY OF CORRODED CONCRETE FILLED CIRCULAR CFRP-STEEL TUBE STUBS

作　　者：王东锋 邵永波[2] 欧佳灵 WANG Dong-feng;SHAO Yong-bo;OU Jia-ling(School of Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,China;School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学机电工程学院,成都610500 [2]西南石油大学土木工程与测绘学院,成都610500

出　　处：《工程力学》2021年第10期188-199,共12页Engineering Mechanics

基　　金：工程结构安全评估与防灾技术四川省青年科技创新研究团队项目(2019JDTD0017);国家自然科学基金面上项目(52078441)。

摘　　要：对不含腐蚀圆钢管混凝土(T4.5-CFST)短柱、含腐蚀缺陷圆钢管混凝土(C-CCFST)短柱以及碳纤维增强复合材料(CFRP)加固含腐蚀缺陷圆钢管混凝土(CFRP-C-CCFST)短柱的轴压承载力进行了试验研究。用材料去除的方式模拟腐蚀缺陷。共完成19个试件的轴压承载力试验,包括:T4.5-CFST短柱1个、C-CCFST短柱8个以及CFRP-C-CCFST短柱10个。试验结果表明:在试验参数范围内,相对于T4.5-CFST试件,C-CCFST试件极限承载力下降范围为3.0%~22.9%;相对于C-CCFST试件,CFRP-C-CCFST试件极限承载力提升范围为26.8%~49.8%。相比C-CCFST试件,由于外部CFRP的约束作用,CFRP-C-CCFST试件具有更大的轴压刚度和极限承载力,极限承载力均高于T4.5-CFST试件,表明CFRP加固试件具有更好的力学性能。CFRP加固能够有效地抑制腐蚀缺陷区域钢管的局部屈曲。此外,进一步对CFRP加固含腐蚀缺陷圆钢管混凝土短柱极限承载力进行了理论研究,并采用试验结果验证其准确性。The axial compressive capacities of non-corroded concrete filled circular steel tube(T4.5-CFST)stubs,corroded concrete filled circular steel tube(C-CCFST)stubs,and CFRP-corroded concrete filled circular steel tube(CFRP-C-CCFST)stubs were studied experimentally.The corrosion defects were simulated by material removal.A total of 19 specimens were tested,including one T4.5-CFST stub,eight C-CCFST stubs,and ten CFRP-C-CCFST stubs.Within the ranges of the test parameters,the test results show that the ultimate strengths of the C-CCFST specimens were lower than those of the T4.5-CFST specimen by 3.0%to 22.9%.The ultimate strengths of the CFRP-C-CCFST specimens were increased by 26.8%to 49.8%as compared with those of the CCCFST specimens.Compared with the C-CCFST specimens,the CFRP-C-CCFST specimens had greater axial compressive stiffness and ultimate strengths due to the confinement effect of the CFRP.The ultimate strengths of the CFRP-C-CCFST specimens were higher than that of the T4.5-CFST specimen,indicating that the specimens strengthened by CFRP have better mechanical performance.The local buckling of the steel tubes with corrosion defects was effectively restrained by the CFRP.In addition,the ultimate strengths of the CFRP-corroded concrete filled circular steel tube stubs were studied theoretically.The accuracy was verified by the experimental results.

关 键 词：CFRP 圆钢管混凝土短柱 腐蚀缺陷 轴压承载力 试验测试 极限承载力计算 

分 类 号：TU375.3[建筑科学—结构工程]