Research On Dynamic Response Of Continuous Beam Bridge Under Vehicle Load

In this paper, first, the introduction of the basic existing theory of bridge vibration, and the concept of bridge deck roughness. Second, The car load on continuous reinforced concrete box bridge, we analysis the changes of the beam's deflection when the car traveling in different lane, and the dynamic response of bridges in different weight, speed, deck roughness (vertical displacement, vertical acceleration) by using finite element software ANSYS. And then, in the Shan xi Province, the dynamic and static load test was designed and done about Tang Ping Gou Bridge, we analysis the carrying capacity of the bridge and work performance. Final, simulating different traffic flow and six-axis car that through the bridge by using finite element software ANSYS, and the dynamic response of bridge structures.The main research work is as follows in the paper:1,using finite element software ANSYS to simulate the load of vehicles on a beam, by static analysis, dynamic analysis, fatigue analysis, provided a fatigue analysis option of the local bridge that the vehicle load on.2,establishing three-dimensional model by large-scale finite element software ANSYS, in accordance with the Road Bridge Construction simulating a bridge in service, through the change of deck roughness, the speed, the vehicle to consider continuous box girder bridges dynamic response, resulting in their analysis of the structure of data is closer to the actual bridge.3,through the load test, we analysis the carrying capacity of the bridge structure and the work performance; calculated different traffic flow and six-axis car through the bridge structure, getting the relationship between overload phenomenon and the dynamic response of bridges,4,In this paper, the innovation of the research work are as follows: first, using the method of tendon force entities in the model, the establishment of the prestressed reinforcement and concrete units, establishing three-dimensional model by the finite element software ANSYS for the bridge entity, to make it more in line with the actual situation of the bridge, results is more accurate. Second, in regard to a six-axle vehicles through the bridge in road transport, in accordance with the actual axle distance, calculated the changes in the characteristics of vertical deflection of the bridge, the stress on bridge and the stress at the end of the beam as axle load or speed is changes.