Continuous Girder Bridge Reinforcement Method Analysis

With the significant increase of traffic, the traffic flux as well as traffic loads are increasing. Especially after the application of trailer and container, more and more heavy vehicles are appearing. Nevertheless for a considerable amount of aged bridges, the damages, such as material aging, fissures, structure injuries etc, and the insufficiency of bridge width lead to traffic congestion, even block the traffic, which results in inestimable loss to national economy and much inconvenience to industrial production and daily life, even threatens the transport security. Therefore, the reinforcement and maintenance of aged bridges are in urgent need.This article introduced the first bridge strengthening and maintenance of the basic principles as well as the primary means of strengthening the principle of reinforcement methods, characteristics and application of reinforcement, in reference to the most commonly used method of reinforcement of the girder bridge test, the application of research results, based on continuous bridge strengthening program for theoretical analysis and comparison. Paste the text used in steel, in vitro and shorter tower cable-stayed prestressed system established three types of reinforcement methods on three-span continuous girder bridge reinforcement calculation. Through the reinforcement before and after the deflection, stress comparison, reflecting the three types of reinforcement methods on the original structure of the different effects of reinforcement.Reinforcement in each method, different design of the program, through the main beam deflection, the stress of change, to find the reinforcement is relatively reasonable. Made for different design options, the main beam deflection, the stress curve.The use of ANSYS finite element analysis program for pre-and post-reinforcement reinforcement beam finite element analysis, under the most adverse load before and after the main beam reinforcement and stress deflection curve. Reinforcement method for each of the different options, the main beam of the stress, deflection changes in the trend of the actual reinforcement of the bridge and provide a theoretical basis.