Study On Performance Of Prestressed CFRP Plate Anchorage System

At present,in the field of structural reinforcement,commonly used concrete reinforcement methods have some shortcomings.Due to the good mechanical properties of carbon fiber materials,carbon fiber material reinforcement technology is gradually applied to the field of structural reinforcement.Carbon fiber has the characteristics of light weight,high strength and stable performance.Therefore,compared with the traditional concrete reinforcement method,the carbon fiber material reinforcement method has certain advantages in fatigue resistance,corrosion resistance and durability,and is convenient for construction.Commonly used in existing projects is the ordinary paste carbon fiber sheet reinforcement method,but the method still has the following shortcomings: low material strength utilization rate,unable to effectively improve the performance of the reinforced member,can’t repair the member after the first stress Damage problems,prone to end peeling damage,no good anti-stripping measures,etc.Prestressing the carbon fiber sheet can not only effectively improve the shortcomings above,but also make full use of the high-strength characteristics of the material,reduce the risk of end stripping damage by mechanical anchors,reduce the strain hysteresis effect,and increase the bearing capacity of the component to a greater extent.Reduce crack width and component deflection to further improve component performance.Based on the preliminary research and development of our research group,this article has once again improved and optimized the prestressed carbon fiber plate infused cylindrical wedge anchorage.The main work contents are as follows:(1)Starting from the anchoring mechanism of cast-in cylindrical wedge anchors,in view of the existing shortcomings of the anchors,an improved idea of increasing the angle of inclination of the wedge body in the anchors to improve the performance of the anchors is proposed to lay the foundation for the next research.(2)The finite element software ABAQUS was used to simulate the ultimate anchoring force test of the cast-in cylindrical wedge anchor.The influence of the inclination angle of the wedge inside the anchor on the stress,strain and slip of the carbon fiber board and structural colloid was analyzed.The results of simulation analysis show that: properly increasing the angle of inclination of the wedge inside the anchor will help reduce the compressive stress on the colloid,at the same time,it can effectively reduce the slippage of the carbon fiber board and colloid and improve the durability of the anchor.Improvement provides theoretical support.(3)After determining the inclination angle of the internal wedge-shaped groove of the anchor,a series of tests were used to continuously optimize the cast-in cylindrical wedge-shaped anchor,and the ultimate anchoring force and the final amount of colloidal slip of the cast-in cylindrical wedge-shaped anchor were tested.The test results show that the ultimate anchoring force of the anchor system can reach 217.4k N,and the amount of slip is controlled within 5mm,which can better meet the actual requirements of the project.