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ATS International Journal
Editor in Chief: Prof. Alessandro Calvi
Address: Via Vito Volterra 62,
00146, Rome, Italy.
Mail to: alessandro.calvi@uniroma3.it

The influence of concrete bridge span on vehicle traffic safety

Y.J. Liang, J. Yi
Pages: 31-42

Abstract:

The dynamic loads generated on bridges during vehicle travel are complex and varied, making it difficult to accurately evaluate the bearing capacity of bridges under dynamic loads, resulting in poor accuracy in analyzing the impact of concrete bridge span size on vehicle traffic safety. Therefore, research is conducted on the impact of concrete bridge span on vehicle traffic safety. Considering the interaction between vehicles and bridges, a vehicle bridge coupling vibration equation is constructed to simulate the stress state of bridges under dynamic loads, accurately analyze the stress between concrete bridges and vehicles, and obtain the key factors affecting the safety of vehicle passage in the span of concrete bridges, Based on this, calculate the bearing capacity coefficient of concrete bridge span and determine the bearing capacity of vehicle passing bridge span, Finally, based on the bearing capacity of the bridge span, the cumulative fatigue damage of the bridge is calculated, and the stress ratio is used as the benchmark for bridge load limit and vehicle traffic judgment, to achieve the study of the impact of concrete bridge span on vehicle traffic safety. The experimental results show that the span of concrete bridges has a certain impact on the dynamic impact coefficient, and for concrete beam bridges with different spans, as the vehicle speed increases, the overall trend of the impact coefficient of the fulcrum bending moment increases, thereby affecting the safety of vehicle passage. Moreover, the method proposed in this article can achieve a maximum estimation accuracy of 99.8% for the maximum carrying capacity of vehicles passing through concrete bridges, indicating that the method can accurately estimate whether vehicles can safely pass through concrete bridges and accurately analyze traffic safety.
Keywords: stress ratio; concrete bridges; span size; vehicle bridge coupling vibration; bridge bearing capacity coefficient

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