Seismic Analysis of Integral Abutment Bridge – Comparison of Framed Abutment with Fixed Base and Hinged Base

Abstract

<p>Integral Abutment Bridge {IAB) is the bridge in which the superstructure and substructure is monolithically casted. The advantages of IAB bridge are: less maintenance, better seismic performance due to increased redundancy. In this study, the IAB bridge with 1.0 m diameter pile in 2x10 pile configuration is compared with</p><p>1.5 m diameter piles in 1x8 pile configuration. The limit equilibrium method as per IRC:SP:115 is used instead of soil structure interaction for backfill. Soil pile interaction is represented by the linear soil spring. The site - specific response spectra is used for Elastic Response Spectrum Analysis. Temperature loading, Creep, shrinkage, differential settlement; Live load and live load surcharge are applied in the model as per IRC:6- 2017. The beam element is used to model the superstructure and pile. Plate element is used for pile cap and abutment wall. The time period of hinged base model is significantly larger than fixed base model. The pile top displacement and abutment top displacement is higher in hinged base model than the fixed base model.</p>