The Research On Damage Assessment And Simulation Reinforcement Technique Of The Prestressed Concrete Bridges

With the rapid development of transportation and greatly improve of the railway traffic volume,the double-chip prestressed concret T beam in early period inevitably exposed a variety of structural damage and lead to deficicency of bearing capacity,decreasing of transverse stiffness,reducing of durability and decreasing of the operational sfety of train as the result of different design standard and load types,and because of great prestress loss.Therefore,how to carry out damage assessment and reinforcement design on exsiting Railway Bridge to ensure the safe and smooth of the railway has aroused the concern of the relevant department.In this paper,firstly,based on summarize the principle of bridge structural damage, the causes and type of damage and the method of damage detection,we introduce the basic principle of fuzzy mathematics into comprehensive damage assessement of bridge.According to fuzzy comprehensive evaluation method,establish evaluation model and carry out damage assessment to Li River bridge follow the method of damage assessment of highway bridge.Secondly,according to analysis the exisiting data and the results of assessment establish main beam damage element model by Midas FEA of Li River and carry out damage analysis.Contrast the results of damage ananlysis with the date of static and dynamic load test.This aticle is focusing on according to the principle of bridge reinforcement, choose reinforcement scheme and establish strengthening finite element analysis model, carry out scheme comparison of tranverse reinforcement and obtain the optimum strengthing scheme.in aspect of improve the strength of beam use plate sticking reinforcement and get the optimum strengthing scheme by change the design partemeters related to reinforcement.Finally,introduce the tranverse reinforcement and plate sticking reinforcement into the damage finite element analysis models to carry out research of comprehensive reinforcement.In this paper,the analysis of establish damage finite element analysis models and simulation reinforcement provide some data and reference to practical engineering.