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为考察在役钢管混凝土界面粘结性能与荷载作用时间的关系,以荷载作用时间段为基本参数,完成了7根圆钢管混凝土试件的推出试验。试验结果表明,钢管混凝土界面粘结力随荷载作用时间的延长而减小。根据试验结果,得出各个试件的荷载-滑移曲线。基于ANSI/ACI 308-1992混凝土养护规程,得出每个试件在荷载作用下的混凝土徐变应变。从损伤力学的角度出发,定义界面损伤变量,推导了混凝土徐变应变与损伤的关系。通过回归得出含损伤变量的界面粘结-滑移本构关系。
In order to investigate the relationship between the in-service interface of concrete-filled steel tube (CFST) and the loading time, the launching test of seven CFST specimens was completed with the loading time as the basic parameter. The test results show that the interfacial adhesion decreases with the extension of loading time. According to the test results, the load-slip curve of each specimen is obtained. Based on the concrete curing procedure of ANSI / ACI 308-1992, the concrete creep strain of each specimen under load was obtained. From the point of view of damage mechanics, the interface damage variables are defined, and the relationship between concrete creep strain and damage is deduced. The interface bond-slip constitutive relation with damage variables is obtained by regression.