Vehicle-bridge Coupling Vibration Research And Impact Analysis For The Oblique Cable-stayed Bridge With Single Arch Pylon

In recent years, with the development of economy,technology and materials, more and more complicated highway cable-stayed bridge was built in today’s society. As the cable-stayed bridge structure is becoming much more complex and lighter and flexible, at the same time the speed of vehicles is faster and the weight of the vehicle is heavier than before, the vehicle-bridge coupling vibration problems still call for further research. Vehicle-bridge coupling vibration research for highway bridge is relatively later than railway bridge and mainly focus on the sample bridge at present.With wide application of finite element method and structural analysis software, a numerical calculation method based on finite element analysis software has realized the analysis of a variety of complex Bridges in complex under the condition of vehicle-bridge coupling vibration.By the the conditions of compatible displacement of vehicle and bridge, this paper takes the vehicle-bridge system as two separate subsystems. At first, build the oblique cable-stayed bridge with single arch pylon spatial grillage model and7DOF whole vehicle model. Then according to the ’D’ Alembert principle, derive the vibration equation, and use the precise time-integration method which is based on Matlab language to solve the vehicle equation. At last, by the large general structural analysis software ANSYS to realize the coupling vibration analysis of established bridge model and vehicle model. For the road surface excitation effect under the vehicle action, the paper is based on the power spectral density function advised by GB/T7031-2005, the value of bridge deck roughness was obtained by Fourier reverse transform. Taking the oblique cable-stayed bridge with single arch pylon spatial grillage model and7DOF whole vehicle model as the research object, for the influence of different vehicle velocity、road roughness、secondary dead load transverse location and transformed the lane load into the vehicle team load, the paper has carried on the comparative analysis. This research method has a certain universality, can be applied to the similar bridge construction, and has certain reference and reference value to this kind bridge and the similar bridge,and provide basis to the maintence of bridge management.Through the research of this paper,prove that the vehicle-bridge coupling vibration based on finite element analysis software ANSYS numerical calculation method has wide university and can realize the vehicle-bridge coupling vibration numerical calculation of continuous system bridge,arch bridge,suspension bridge,cable-stayed bridge and don’t need to formate more complex program.the method is not only convenient and quick,but also acceptable for engineering designers.