Structural Performance of a Four Span Warren Truss Bridge with Two Damaged Members Subjected to Horizontal Loading

The structural integrity of steel truss bridges can be significantly compromised by multiple damaged members, especially under lateral loading conditions. This study investigates the structural response of a four-span Warren truss bridge with dual damaged members subjected to a concentrated horizontal load of ۲۰۰ kN. A two-dimensional finite element model was developed using Abaqus to simulate the bridge behavior and to assess the effects of simultaneous stiffness reductions in two critical members. The results reveal a substantial increase in lateral displacements and Von Mises stress concentrations compared to single-member damage and intact conditions. Maximum vertical displacements reached up to m, and peak Von Mises stresses increased to approximately Pa, indicating a severe degradation in structural stiffness and load-transfer efficiency. The findings emphasize the enhanced vulnerability and reduced redundancy of the Warren truss system under combined damage, highlighting the necessity for comprehensive inspection and timely maintenance strategies to prevent progressive collapse under horizontal loads.

کلیدواژه ها:

Warren steel truss bridge ، dual damaged members ، horizontal loading