Theoretical and Experimental Study on Load-Carrying Capacity Evaluation of CFRP Plates Bond-Type Anchors

Abstract

In order to reveal the anchorage mechanism of CFRP plate anchorage, a theoretical model of the bearing capacity and critical anchorage length of CFRP plate anchorage is established. The relationship between shear stress and compressive stress of anchorage interface is obtained by experiments. The model considers the longitudinal reduction of the interface shear stress in the anchorage zone, and the longitudinal reduction coefficient of the interface shear stress is measured by experiments. The influence of parameters of plate anchorage on anchorage performance is analyzed by using the above model. The results show that the longer the anchorage length is, the larger the reduction rate of interfacial shear stress is. The design bearing capacity and critical anchorage length of anchorage increase linearly with the increase of CFRP plate size. With the increase of interfacial compressive stress, the interfacial shear stress increases and the critical anchorage length decreases. When the interfacial compressive stress is less than 100 MPa, the size of the interfacial shear stress is linear with the interfacial shear stress. For the commonly used engineering CFRP plate with the size of 100mm*2.0mm, when the interface pressure stress is 100MPa and the design value of the tensile strength of CFRP plate is 2400MPa, the required critical anchorage length is 279mm, and the corresponding anchorage design bearing capacity is 720kN, which can make the tensile strength of CFRP plate fully play in theory.