Abstract
This study consists of the development and presentation of example of seismic isolation system analysis and design for a continuous, 3-span, cast-in-place concrete box girder bridge. It is expected that example is developed for all Lead-Rubber Bearing (LRB) seismic isolation system on piers and abutments which placed in between super-structure and sub-structure. Design forces, displacements, and drifts are given distinctive consideration in accordance with Caltrans Seismic Design Criteria (2004). Most of all, total displacement on design for all LRBs case is reduced comparing with combined lead-rubber and elastomeric bearing system . Therefore, this represents substantial reduction in cost because of reduction of expansion joint. This presents a summary of analysis and design of seismic isolation system by energy mitigation with LRB on bridges.
Highlights
Seismic isolation systems are the separating of structures from ground motions generated by earthquakes which could induce damage to the structures
Among various seismic isolation systems, lead-rubber bearing (LRB) which has innovative mechanism can lead to increased effective stiffness and is accommodating force in reinforced concrete (RC) structures
The bridge was used as an example of bridge design without an isolation system in the Federal Highway Administration (FHWA) Seismic Design Course, Design Example No 4, prepared by Berger/Abam Engineers (1996) [2]
Summary
Seismic isolation systems are the separating of structures (such as bridge, building, railway, road, airport, harbor, dam, and tunnel etc.) from ground motions generated by earthquakes which could induce damage to the structures. Among various seismic isolation systems, lead-rubber bearing (LRB) which has innovative mechanism can lead to increased effective stiffness and is accommodating force in reinforced concrete (RC) structures. (2014) A Study on the Seismic Isolation Systems of Bridges with Lead Rubber Bearings. Kim et al design procedures for seismic isolation system. The bridge was used as an example of bridge design without an isolation system in the Federal Highway Administration (FHWA) Seismic Design Course, Design Example No 4, prepared by Berger/Abam Engineers (1996) [2]. The geometry of the bridge, section properties and foundation properties are assumed to be the same in the original bridge in the FHWA example (2000) [3]. It is presumed that the original bridge design is sufficient to sustain the loads and displacement demands when seismically isolated as described . Minor changes in the bridge geometry were implemented in order to facilitate seismic isolation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
