Experiment And Analysis Of Concrete Continuous Beams Strengthened With CFRP Sheets

Recently, CFRP reinforced concrete structure technology has been widely used in civil engineering fields and has been a hot research at home and abroad due to its technological advantages in high-strength, anti-corrosion performance, durability, light weight etc.In order to study the mechanical performance on concrete continuous beams strengthened with CFRP sheets,3 two-span continuous beams strengthened with CFRP sheets in the control-section at each span are tested with two-point loading type. The test date such as crack distribution, deformation are obtained in different load stages.On the basis of the test data, nonlinear finite element analysis on the continuous beams strengthened with CFRP sheets is carried out by using ANSYS software. The results of finite element analysis show that the revised finite element results and the test results are compared and they are in good agreement. Based on it, nonlinear finite element analysis on the mechanical performance of 9 continuous beams strengthened with CFRP sheets under load is made by using ANSYS software. The bearing capacity in different stages are obtained, including the the yield moment of longtitude steel bar on intermediate support and in the control-section of span, and the moment of CFRP sheets is pulled off. The crack distribution, deformation are calculated.According to the finite element analysis results and the test date, the change of internal force redistribution of the test beam at different stages are elaborated, and the bearing capacity in different stages related to the reinforcement ratio and the span of the test beam is pointed out. The ratio of the reinforcement ratio on intermediate support and the span is defined as independent variableβ0, and the ratio of the reinforcement ratio in the control-section of span and the span is defined as independent variableβm. The relationship between the bearing capacity in different stages and the independent variableβ0,βm are obtained, including the the yield moment of longtitude steel bar on intermediate support and in the control-section of span, and the moment of CFRP sheets is pulled off.The further analysis on the redistribution of internal force is carried out of the continuous beams strengthened with CFRP sheets. On the basis of the test data and the analysis results, the calculation formulas of coefficient of redistribution of inner force are established respectively corresponding to the yield moment of longtitude steel bar on intermediate support and in the control-section of span, which is accumulated for the design of the continuous beams strengthened with CFRP sheets.