In order to analyze the impact effect of vehicle loads on the cables of cable-stayed bridges, a domestic in-service cable-stayed bridge and a certain type of five axle load vehicle were studied. The dynamic response and impact coefficient of the cables under different working conditions were analyzed using finite element method. The calculation results were compared with the current national standards, and a recommended value for the dynamic impact coefficient of the cables was proposed. The simulation case considers the impact of vehicle speed (50km/h-120km/h), road level (smooth, Class A, Class B, Class C), and vehicle lateral position on the results. The research results indicate that the dynamic impact coefficient of the cable obtained through finite element analysis is greater than the value in the current specifications. As the road level increases, the impact coefficient increases. The impact effect generated by vehicles on the edge lane is greater than that on the middle lane. The influence of changes in vehicle speed on the dynamic impact coefficient of cables at different positions is not consistent. With the same working conditions, the dynamic impact coefficient of short cables is larger. Research has found that road surface grade is the main factor affecting the dynamic impact coefficient of cables. Therefore, it is recommended to take values for the impact coefficient based on road surface grade. The specific recommended values are: 0.08 for smooth road surface, 0.15 for Class A, 0.25 for Class B, and 0.4 for Class C, respectively.
Key words
Vehicle-bridge interaction system /
Cable-stayed bridge /
Cable dynamic impact coefficient /
Road roughness
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