Experimental study on bonding properties of SFCB concrete under repeated loads
In order to solve the problems of complex stress transfer mechanism,bond failure mechanism and stress distribution characteristics of steel-fiber composite bar(SFCB)concrete members under dynamic loading,it carried out center drawing tests under constant and variable order repeated loading,and compared with unidirectional drawing tests.The results show that the bond strength of the specimens under constant and variable order repeated loading is from 11.8%to 19.8%lower than that of the specimens under unidirectional drawing,and the bond interface damage is more serious,and the average bond stress peak value of the specimens under repeated loading is about from 0.5%to 1.6%.The bond-slip curves of specimens with different loading modes are similar,and the relative slip of steel core and fiber layer occurs due to inconsistent deformation.The bonding stress of SFCB along the buried length is not uniformly distributed,and the stress"peak"shape is different with different loading methods.To clarify the bond performance of SFCB concrete under repeated load can provide important reference for the structural design of SFCB concrete and the establishment of bond-slip curve model.
steel-fiber composite barrepeated loadingbond propertiesbond-slip curvestress distribution
万方数据
