Design optimization of bridge pier bearings based on material and shape

Abstract

Elastomer bearings are design efficient and economical, so these are more widely used for bridge construction. Steel bearings were predominantly used before and their performance was good with few disadvantages due to their corrosive nature and high maintenance. Hence elastomer was introduced as a matrix material for steel bearings. In present study, analysis of mechanical properties is carried by changing elastomer material. The results showed that it is better to produce strong and effective reinforced elastomer bearing using material other than natural rubber. The study compares results of bearing elastomer using silicone rubber, PTFE (Polytetrafluoroethylene) with the conventional synthetic natural rubber elastomer bearing. The effect of shape on maximum stress and deformation is also analysed. The bearing used in the case study is designed for forces applicable to metro rail viaduct. The load calculations are done using the specification provided by BMRCL (Bangalore Metro Rail Corporation Limited). The analysis for stress and deformation is performed using ANSYS. The maximum stress, strain and deformation in bearing using new materials as elastomer were found to be lesser than the bearing using neoprene elastomer bearing.