RESEARCH ON THE FLEXURAL BEHAVIOR OF REINFORCED CONCRETE T-BEAMS STRENGTHENED WITH HIGH STRENGTH STEEL WIRE MESH

摘要

Rehabilitation of RC members with stainless steel wire mesh and permeability polymer mortar is a new method of structural strengthening with the advantages of resistance to fire,corrosion and ageing. First,the steel wire cable was tensioned and bolted on the surface of the RC members. Then the permeability polymer mortar was casted on it. In this way the strengthened part and the original structure were combined into one integral. Therefore,it can enhance the bearing capacity and durability of the structure. Experiments were conducted to investigate the flexural behaviour of five strengthened RC Tbeams under different types of loadings. In addition,the finite element software was used to simulate the flexural strengthened RC T-beams. The influence factors such as the concrete strength,reinforcement ratio,the amount of wire cable and secondary load were discussed. The results show that the bending capacity of the strengthened beam can be greatly improved. As the concrete strength,reinforcement ratio and the amount of wire cable increase,the yield capacity,ultimate capacity and yield deflection can be improved,but the ultimate deflection decreases and the ductility wanes. The performance of the strengthened members under secondary load is varied according to the magnitude of sustained load. The failure mode of the strengthened members is affected by the reinforcement ratio,concrete strength and so on. Based on the plane section assumption and combined with the experimental data,the calculation methods of flexural capacity of strengthened beams were proposed.