STUDY ON MECHANICAL PROPERTIES OF BEAM BRIDGE REINFORCED WITH MULTIPLE REINFORCEMENT METHODS UNDER CORROSIVE ENVIRONMENT

In order to compare the effects of different reinforcement methods on the performance improvement of the damaged bridge members in corrosive environment, four reinforcement methods, such as pasting CFRP sheet, pasting BFRP sheet, anchoring and pasting steel plate and increasing section method, were carried out to analyze the mechanical properties of the corroded reinforced concrete beam bridge members after reinforcement. The bearing capacity, stiffness and safety reserve of the corroded beams under the above four strengthening methods were compared through the test results and theoretical analysis. The results showed that the above four strengthening methods could greatly improve the ultimate bearing capacity of corroded beams, but the yield and failure modes of corroded beams were quite different under different strengthening methods. In addition, the method of anchoring and pasting steel plate had the largest increase in stiffness and the largest safety reserve before damage; the method of pasting CFRP had the second increase in stiffness, but the minimum safety reserve before damage; the method of pasting BFRP and increasing section had the same increase in stiffness of corroded beam and was smaller than that of pasting CFRP, but the safety reserve before damage was better than that of pasting CFRP.