建筑结构学报2013，Vol.34Issue(7)：148-157,10.
圆钢管再生混凝土界面黏结失效的推出试验研究
Failure mechanism of interface bond behavior between circular steel tube and recycled aggregate concrete by push-out test
摘要
Abstract
In order to reveal the interaction failure mechanism of bond performance at the interface of recycled aggregate concrete filled circular steel tubes (RACFCST),a total of 15 RACFCST short column specimens were designed for push-out test.Three test parameters of replacement rate of recycled coarse aggregate (RCA),concrete strength grade and length to diameter ratio were considered to research their influences on bond behavior of RACFCST.Load-slip curves,distribution laws of bond strain and bond load for RACFCST specimens were obtained.For contrastive computation,practical formulas for bond strength of concrete filled steel tube (CFST) were used to calculate that of the RACFCST.The regression bond strength formula was put forward.The results show that the initial slip at the loading end develops earlier than that at the free end.The longitudinal strains of steel tube in the early and late loading stages respectively exhibit a negative exponent distribution and linear distribution.Along with the increasing of the ratio of length to diameter,the bond load of RACFCST will be increased to some extent.The development of interfacial bond damage can be advanced with the increasing of RCA replacement rate.At the same time,energy dissipation of bond slip is much better along with the increasing of interface embedded length.关键词
圆钢管再生混凝土/推出试验/黏结强度/损伤/耗能Key words
recycled aggregate concrete-filled steel tube/ push-out test/ bond strength/ damage/ energy dissipation分类
建筑与水利引用本文复制引用
徐金俊,陈宗平,薛建阳,苏益声..圆钢管再生混凝土界面黏结失效的推出试验研究[J].建筑结构学报,2013,34(7):148-157,10.基金项目
国家自然科学基金项目(50908057,51268004),广西自然科学基金项目(2012GXNSFAA053203,2013GXNSFDA019025),广西科技攻关项目(桂科攻12118023-3),广西理工科学实验中心重点项目(LGZX201102). （50908057,51268004）
