Performance Analysis of Bridges- Assessing Damage Impact and Performance Degradation

This paper presents an investigation into the effects of bearing stiffness variations and vehicle speeds on the performance of bridges, with a focus on elastomeric bearings. Using finite element analysis (FEA), the study simulates the behaviour of a bridge subjected to varying load scenarios, including dead load + live load (DL+LL) and truck load conditions. Elastomeric bearings, modified at specific spans (99.6m, 182.6m, and 265.6m), are analysed for stiffness reductions (0.25%, 0.7%, and 0.9%) and their impact on bridge response. The results show that the central span (182.6m) experiences the highest displacement and stress, with peak displacement occurring around mid-span. As bearing stiffness decreases, axial forces and displacements increase, particularly under truck load conditions. This leads to higher stress concentrations in damaged bearings, which can compromise load distribution and bridge stability. The paper also explores the dynamic effects of varying vehicle speeds, revealing that higher speeds exacerbate displacement and stress. The findings emphasize the critical role of bearing stiffness in load transmission and the need for regular monitoring and predictive modelling to optimize bridge performance. This research provides valuable insights for improving maintenance practices and extending the service life of bridges through more accurate damage assessments and strategic interventions.