Analysis on the Influencing Factors of Fatigue Damage in Truss Bridge

Abstract

Truss bridges are susceptible to fatigue damage due to long-term exposure to external factors. This article mainly analyzes the influencing factors of fatigue damage in truss bridges, including load factors and joint factors. The analysis results indicate that load factors have a significant impact on the fatigue damage of truss bridges. Vehicle loads can cause deformation and stress concentration in bridge structures, leading to the generation of shear stress, which in turn triggers the expansion of stress concentration areas and accumulation of fatigue damage in bridge materials. Additionally, improper vehicle operation, such as overloading, can increase the dynamic strain on the bridge deck, causing deformation and fatigue damage to the main girders. As for joint factors, joints are one of the critical areas for fatigue damage in truss bridges. Stress concentration and deformation at joints increase the risk of fatigue crack formation and propagation. In this way, the life and safety of the bridge can be assessed, and appropriate maintenance and repair measures can be taken to improve the fatigue resistance of the bridge and ensure its safe operation.