摘要
通过6个双面叠合试件剪切性能试验,研究不同界面连接钢筋形式下叠合面的抗剪特性.试验结果表明,双面叠合构件均发生叠合面的剪切破坏,叠合面的裂缝出现过程并不同步,在叠合面裂缝出现之前,叠合试块整体性保持良好;叠合无筋构件呈明显的脆性破坏特征,破坏过程中改进的箍筋连接构件的延性优于传统的桁架连接构件;通过理论分析确定叠合面的破坏机理即新老混凝土界面的极限抗剪强度由混凝土黏结力、摩擦力和界面钢筋的销栓力共同作用,然而极限状态时界面的黏结力已经有一定程度的破坏,在计算极限承载力时并不能用三者的最大值简单相加.
The shearing performances of adhesive interface under different types of connecting reinforcement were analyzed through six double-superimposed specimens. The results showed that shear failure of the interface is the cause of failure of double-superimposed specimens, but the crack formation and development in the two interfaces are not in synch, the double-superimposed specimen kept good integrity until cracks begin to appear. The failure of non-reinforced specimens is brittle, during the process of failure, the improved specimens in which the type of connecting reinforcement is stirrup taken on better ductility than the traditional ones in which the type of connecting reinforcement is truss bar. The ultimate shear strength of the interface is determined by adhesion of interface, shear-friction and dowel action of shear reinforcement, however, adhesion of interface has been destroyed in a certain extent under the limit state, the ultimate bearing capacity of double-superimposed specimens is not simply by summarizations of maximum of three parts.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第5期664-672,共9页
Journal of Tongji University:Natural Science
基金
上海市科委重大课题(14DZ1202100)
关键词
预制装配式
叠合面
连接钢筋
剪切性能
prefabricated construction
adhesive interface
connecting reinforcement
shearing performance
