International Journal of Advance Civil Engineering and Technology ISSN: 3107-7374 (Online)

Authors: Sanath Kumar D, Dr. Sheik Kabeer Ahmed

Abstract: Bridges play a significant role in transport connection as they ensure continuous transportation network between two inaccessible vicinity. During the period of natural disaster such as earthquakes, it provides an emergency services like supply of food, medicines etc.; hence, the bridges are lifeline structures. Bridges are very susceptible to ground motions due to simplicity in their construction; hence they are prone to damage and even collapse completely. "The general earthquake design principle is to design a structure to prevent complete collapse in case of strong earthquake ground motion". The resistance of structure to earthquake can be ensure either by building structural member strong enough so that it is capable to resist earthquake excitation or by use of dampers or by employing base isolation systems. Among these, base isolation is gaining significant popularity in the recent years. So far, the performance of bridges under seismic loads has been evaluated by many with different isolators at the junction of the bridge deck and the top of pier cap. But very less such information is available for the seismic performance evaluation of bridges with base isolation at the foundation level. Hence the objective of this study is to assess the seismic performance of an RC bridge with three different types of isolators (ie., Lead Rubber Bearing, High Damping Rubber Bearing and Friction Pendulum System) at the bottom of the bridge piers.

Keywords— Base isolation; Isolators; Isolation system; Lead Rubber Bearings; High Density Rubber Bearing; production; SAP2000;  SACS ; Bridge with base isolators; seismic behavior on bridges; Type of Isolator; results using base isolators on bridge .