Structural Performance of a Four Span Warren Truss Bridge with a Damaged Member under Combined Horizontal and Vertical Loading

This study investigates the structural response of a four-span Warren steel truss bridge with a damaged member subjected to combined horizontal and vertical loading. A two-dimensional finite element model was developed in Abaqus to analyze the behavior of the bridge under simultaneous lateral and vertical forces. The bridge has a total length of ۲۰ m with four equal spans and a truss height of ۵ m. Structural damage was simulated by reducing the stiffness of one selected truss member to represent partial loss of load-carrying capacity due to deterioration or accidental damage. A concentrated horizontal load and a vertical load, each with a magnitude of ۲۰۰ kN, were applied simultaneously to evaluate the structural response. The numerical results indicate that the presence of a damaged member significantly influences the displacement pattern and stress distribution within the structure, leading to load redistribution among adjacent members. The interaction of horizontal and vertical loads further affects both lateral and vertical deformations of the bridge. These findings highlight the importance of considering member damage when evaluating the performance and structural reliability of steel truss bridges subjected to combined loading conditions.

کلیدواژه ها:

Warren steel truss bridge ، load-carrying capacity ، horizontal and vertical loads