Investigation About Evaluation Of Technical State And Reinforcement Methods For Existed RC Slab Bridges

With the development of the Nation's Economics,the traffic amount increases rapidly and the loads of the bridges bearing are more and more aggravating.Considering the factors of design,construction and age etc.,a lot of bridges have been damaged over the days.The design specification has got new development in the construction of the highway bridge,a lot of bridges carrying capacity have been get down and linear restriction,going so far as to influence their service,being serious influencing the normal use of the bridge and need to be maintained or strengthened in time.The arterial road in our country,has a large number of RC slab bridges,however,numerous RC slab bridges in service need to be reinforced and maintained urgently because of its bad condition in technique.Based on the current experimental study results and JTJ H11-2004,this paper investigate about evaluation of technical state;Using the theory of elastic and plastic mechanics,this paper analyzes that flexural complete course for reinforced concrete beams repaired with CFRP,steel plates and composite beam,and presents methods for the ultimate load and the cracked load,as well as considered the effect between considering initial load and without initial load.Putting forward the new method that CFRP(steel plates) and composite beam to strengthen together is directed against the changing of linear restriction. Setting up calculation model of bearing capacity after strengthening in view of dead load is undertake by original structure before reinforcement.Regarding some reconstruction and extension project as the project instance,full detection is carried out roundly on some RC slab bridge in this paper.According to JTGD62-2004,JTJ023-2004 and the principle of economy and rationality,using the reinforcement methods with above-mentioned this paper has put up reinforcement scheme.According to the load test and the detection result,the bearing capacity and service life of the bridge is assessed after reinforcement,having produced good economic benefits.The engineering practice can be taken as reference by other existing similar bridge construction in the future.