Research On Dynamic Response Of Cable-Stayed Bridge With Single Tower Mixed Beam

When the vehicle goes through the structure of the bridge,it will cause vibrations and shocks to the bridge,which is the dynamic response of the bridge.During the period of Bridges in use,the effect of moving load can lead to long-term vibration of the structure of the bridge that would make the bridge component fatigue damage,reduce the strength and stability of the structure of the bridge.With the rapid development of economy,vehicle load is more and more big,the vehicle speed is higher and higher,span bridge structure is more and more big,the bridge building material is becoming more and more light,make the vehicle bridge coupling vibration of the bridge structure are more outstanding,research on the dynamic response of bridge structure is also increasingly important.This article is based on the study of the dynamic response of the bridge.By using the finite element analysis software ANSYS,the dynamic response of research work of the single tower hybrid girder cable-stayed bridge under moving loads is as follows:1?In the finite element model,the moving load is setted as moving spring-mass elements,Through an example of a simple beam,Using ANSYS with the elements are modeled and calculated displacement time history curve,and compared with the use of mathematical software Mathematica's consequence,and the theoretical solution of the test results are workful and correct;2?The dynamic dynamic response analysis of a single tower mixed beam cable-stayed bridge was analyzed by different parameters,and we got some good conclusions.The study found that the number of loading marshals has less effect on the power acceleration of the bridge in which the bridge is not symmetrical.The load speed has a large effect on the acceleration of the power acceleration of the bridge,and the overall trend is inversely proportional.The dynamic acceleration response of the double line with the same way is greater than the dynamic acceleration response of the double line with the opposite way.3?Based on the vertical displacement dynamic response of the main span of the bridge,the calculation of the shock coefficient of the cable-stayed bridge is carried out and it is found that the vertical displacement impact coefficient of bridge steel box girder is not linear relationship with the speed of the train,but with the speed fluctuation it acts up and down;The effect of vehicle marshalling on impact coefficient is not very large.