Dynamic And Static Load Test Evaluation And Research Of Three-Span Concrete T-Beam Bridge Deck

In recent years,with the continuous development of our country's economy and society,the traffic volume of the road is increasing day by day,many bridges in service have been overburdened,the traffic volume is increasing day by day,the bridge appears various diseases,the safety of the bridge structure is threatened,therefore,the safety of the bridge structure is threatened.At present,the safety assessment of bridges is becoming more and more important.Based on the engineering background of a 3×30m prestressed concrete continuous T-beam bridge,the dynamic and dynamic load tests and theoretical analysis of a 3×30m prestressed concrete continuous T-beam bridge are carried out in this paper,focusing on the testing of the dynamic characteristics of the bridge and the test of the bearing capacity of the bridge deck.This paper expounds the development course of bridge detection and safety performance evaluation in China and the world,introduces the advanced research achievements in bridge detection abroad,and makes a brief comparison and analysis based on the current research situation in China.This paper introduces the basic theory of bridge load test,introduces the knowledge of bridge element dynamics,and sets up the bridge finite element analysis frame.The deck model of the 3-span prestressed concrete continuous T-beam bridge is established by Midas/Civil finite element software.According to the design code of the bridge,the internal and external forces are combined to check the static load and dynamic load of the bridge deck,so as to understand the safety status of the bridge.In view of the existence of the bridge Finally,the actual static load test scheme is simulated by finite element model,the deflection curve and stress-strain curve of the bridge are obtained,and the measured data are compared with the results calculated by the model simulation.By comparing the results,the actual operation condition of the bridgecan be understood,and the bearing capacity of the bridge can be evaluated.In the dynamic load test,the actual vehicle moving load(sports car forced vibration)test is simulated by the finite element model,and the concrete dynamic load characteristic of the bridge is obtained by the first ten vibration modes of the bridge.The dynamic characteristics of the bridge are evaluated.In this paper,the finite element software Midas/Civil is used to compare the theoretical calculation with the field test in construction to evaluate the bearing capacity and dynamic characteristics of the bridge in order to ensure the safety of the bridge structure.