COMPARATIVE ANALYSIS OF STEEL ARCH BRIDGE WITH AND WITHOUT BASE ISOLATION DAMPERS IN SEISMIC ZONE V

Abstract

According to IS 1893 (Part 1): 2016, the most severe seismic zone, this study compares the seismic performance of steel arch bridges with and without foundation isolation dampers in Seismic Zone V. The purpose of this research is to determine if base isolation technologies are useful for making bridges more resilient and safer by lowering the seismic loads on important parts of the structure. The ETABS program is used to create a comprehensive 3D model of the steel arch bridge. Utilising representative ground motion data for Zone V, the structural analysis integrates both linear and nonlinear dynamic approaches, namely Response Spectrum Analysis and Time History Analysis. To assess the effect of base isolation on seismic response characteristics such acceleration, natural period, base shear, and lateral displacement, dampers are used in the modelling process.

The results show that seismic forces communicated to the superstructure are much reduced when base isolation dampers are used, which improves energy dissipation and structural stability. Base shear and lateral displacement are significantly reduced in the isolated model when contrasted with the fixed-base model. The purpose of this research is to determine whether or not steel arch bridges in high seismic zone perform better when base isolation devices are used, and to provide useful suggestions for future design decisions based on those findings.