Finite Elements Analysis And Experimental Study On Crack-arresting & Reinforcing Of FRP Girder

The analysis of the failure process of the reinforcement concrete structure based on the fracture mechanics, after many experiment research, the research team which author have been in put forward the three crack-resistance technique named"Retarding","Releasing"and"Resisting"and relative new type reinforcement concrete structures. The new structures has many excellent mechanics behavior, and is a supplement to the traditional structure. It already proves its powerful life-force by many experimental and practice.The paper based on the fracture mechanic principle, point at the concrete structure with crack-arresting layer which is based on the"Retarding", analysis the crack-arresting principle in-depth, and compute it by using the finite element analysis method and experimental validate. First, the in-depth analysis the two fracture mechanic mechanism indicates that the FRP is bring into play by concentrate close force and change the edge crack into inside crack. Then, by using the software MSC.Marc, the crack-arresting principle is calculated by finite element analysis, validate that the FRP crack-arresting layer have predominant crack-arresting behavior, and calculated the law of thickness of the FRP crack-arresting, elastic model, peeling length which effect the crack-arresting result, concluded that the crack-height will be stopped at the height of 0.7 to 0.75 girder's height, the growth law of new crack under more cracks . Last, small girders experiments have been done to validate the law of different FRP material, different stick method, different FRP layers.Through the calculation of finite element method and experiment, the law of FRP crack-arresting has been explored. It's provide reliable theory and experiment validate to the FRP crack-arresting, and is useful for the select of FRP material.