Dynamic Analysis Of Cable-stayed Arch Bridge And Model Experiment Due To Vehicle Load

With the flourishing development of traffic business, the bridge structure is evolving towards long-span flexibility and small quality continuously. At the same time, vehicle load and vehicle velocity are rising rapily. These variations making the effects of vehicle load on dynamic response of bridge structure become more and more remarkable. Long-span cable-stayed concrete filled steel tube arch bridge is a new pattern of combined bridge with the advantages of both cable-stayed bridge and arch bridge. Meanwhile, its unique structure has been put into practice widely. However, the theory investigation of cable-stayed arch bridge is just at the beginning. In the view of this, the dynamic response of cable-stayed arch bridge is studied in detail on the influence of vehicle load. And it base on the Fourth Bridge of Xiangjiang River in Xiangtan city. In this paper:1. Three-dimensional finite element model of cable-stayed arch bridge is established by ANSYS. And then the dynamic response of cable-stayed arch bridge is investigated on the influence of vehicle load considering the roughness of bridge deck, obstacle of bridge deck, vehicle velocity, quality of vehicle, damping and cable. Finally, the variation tendency of impact factor is discussed.2. The Second Similar Law and Dimensional Analisis Method are absored in analyzing the model of cable-stayed arch bridge and then found a dynamic model structure satisfying the need of vehicle vibration experiment. At last, we get the nature frenquency, vibration mode and impact factor of structure through the vehicle vibration experiment.The results show that the influence of bridge deck roughness, obstacle of bridge deck, vehicle velocity, quality of vehicle, damping are conspicuous to dynamic response, especially the obstacle of bridge deck. Because of the existing of cable the stress performance of quarter arch rib is improved.