Finite Element Optimization Analysis of CFRP Reinforced Box Girder Bridge Under Traffic Load

Abstract

In order to study the optimized influence of different pasting methods of CFRP on bridges, the ABAQUS finite element software was proposed, and combined with the structural form of Guangxi Nadezhong Bridge, the influence laws of CFRP pasting directions and CFRP pasting layers on the stress and deflection of bridges were discussed comprehensively. The results showed that the CFRP adhesion effectively reduced the structure stress, span deflection and cracking loads. And increasing pasting angle would decrease the reinforcement efficiency of CFRP, among which the pasting angles of 0° and 90° achieved the best reinforcement effect, reducing the structural stress and mid-span deflection by 17.6% and 17.30%, respectively, and increasing the cracking and flexural load by 3.5% and 5.3%, respectively. A larger number of CFRP layers would lead to gradual reduction of stress and mid-span deflection, and increasing cracking load. Accordingly, longitudinal and transverse CFRP application method and increasing the number of longitudinal CFRP fabric layers were recommended to optimize the bridge bearing structure.