建筑结构学报2024，Vol.45Issue(8)：243-258,16.DOI:10.14006/j.jzjgxb.2023.0200
CFRP-钢复合筋与珊瑚海砂海水混凝土黏结性能试验研究
Experimental study on bond behavior between CFRP-steel composite bar and coral sea-sand seawater concrete
摘要
Abstract
In order to study the bond behavior between CFRP sheet wrapped steel composite bar(CFRP-steel composite bar,referred to as'composite bar')and coral sea-sand seawater concrete(CSSC),15 groups(a total of 45)bonding specimens were subjected to unilateral pull-out tests.The interface bonding failure mechanism of the composite bar and CSSC was revealed,and the influence of composite bar diameter,bonding length,cover thickness,concrete strength,concrete and reinforcement type on the bonding performance was analyzed.The test results show that unlike the steel bar,the shear damage occurs on the surface of the composite bar after sliding due to the poor shear resistance of the outer covering FRP,and the degree of breakage of the concrete in the interface layer is smaller.With the increase of composite bar diameter and bonding length,the bond strength of the interface decreases gradually.When the concrete cover is less than four times the diameter of the composite bar(dc),increasing the concrete thickness can effectively improve the bond strength,but the strengthening effect is greatly weakened after the concrete cover is more than 4dc.Compared with the specimens embedded with composite bar,the bond strength of the specimens embedded with the same diameter of steel bar increases by 17.9％.Compared with natural concrete(NC)specimens,the bond strength of CSSC specimens increases by 23.8％,but the fracture degree of coarse aggregate of CSSC at the splitting interface is much higher than that of NC specimens.Based on the test results and collected similar research results,a formula for calculating the bond strength between composite bar and CSSC was proposed,which shows good calculation accuracy in large sample size.By determining the value range of bond coefficient K,a formula for calculating the critical anchorage length was established.To reflect the entire process of predicting the curve,it is recommended to use the mBPE model to accurately describe the bond stress-slip relationship between composite bar and CSSC in this paper.关键词
CFRP-钢复合筋/珊瑚海砂海水混凝土/拔出试验/黏结性能/黏结应力-滑移本构模型Key words
CFRP-steel composite bar/coral sea-sand seawater concrete/pull-out test/bond behavior/bond-slip constitutive model分类
建筑与水利引用本文复制引用
周济,陈宗平,庞云升,黎盛欣,宋春梅..CFRP-钢复合筋与珊瑚海砂海水混凝土黏结性能试验研究[J].建筑结构学报,2024,45(8):243-258,16.基金项目
国家自然科学基金项目(51578163),中央引导地方科技发展资金项目(桂科ZY21195010),八桂学者专项经费资助项目([2019]79号),广西重点研发计划项目(桂科AB21220012). （51578163）
