Based On The Load Test Simulation Of Internal Stress Of Box Grider To Study Of The Impacts Of Bearing Capactiy

With the rapid development of highway transportation industry, prestressed concrete box girder bridge application in our country is becoming more and more widely. Prestressed concrete box girder bridge have been big, normal use of phase structure system performance is good wait for an advantage, but because of the normal use of the bridge stage by many internal cause and external cause influence, box girder structure system also can appear some diseases, the influence of the bearing capacity of the system. After years of professional personnel for many years observation and analysis, box girder bridge in constant load, box girder prestress, temperature stress, creep and shrinkage of concrete live load stress and the principal stress and under the action of bending deformation occurred, leading to lower its cross flexible and cracking, and make the bearing capacity of the box girder bridge change. How to simple and effective analysis of the bearing capacity of prestressed concrete girders theory change and actual change parameter analysis is the main content of this paper.This paper considers the influence of concrete box girder bridge bearing capacity change the load parameters, and these parameters reference are explained and the expression of these parameters is deduced equation, according to an engineering example to do well the bridge and dynamic load test parameters obtained from the test is derived force and bearing capacity of the bridge with large engineering software ANSYS to establish beam element model for theoretical analysis to compare the results of box girder bridge beam element of comprehensive section balance analysis, reveals the different influence factors of box girder bridge bearing capacity under the changing situation. In this paper, the box girder bridge static load and dynamic load to do a simple introduction, including the load test preparation, test method and test data processing, etc. After the actual bridge detecting data processing, get Bridges in various loading conditions the test parameters, which is applied to the bearing capacity of the bridge was evaluated.At the same time, the use of large engineering software ANSYS to establish the overall parameters according to the bridge bridge model, the simulation load test of the loading scheme get bridge theory test parameters, thus and test parameters are compared, the Bridges in actual normal use process with constant load, box girder prestress, temperature stress, creep and shrinkage of concrete live load stress and the principal stress on the influence of the bearing capacity, In recent years the bridge structure bearing capacity evaluation has been the focus of research is the engineer, to carry out and perfect the evaluation methods can also become deeply research topic, perfect bridge load test and make the correct evaluation of bridge structure performance, to a large extent promote the development of bridge engineering, more accurately mining of the bearing capacity of the existing bridge potential.