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Title of Journal: KSCE J Civ Eng

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Abbravation: KSCE Journal of Civil Engineering

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Korean Society of Civil Engineers

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DOI

10.1016/0042-207x(74)90704-0

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1976-3808

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Effect of lead rubber bearing characteristics on t

Authors: Asif Hameed MinSe Koo Thang Dai Do JinHoon Jeong
Publish Date: 2008/05/03
Volume: 12, Issue: 3, Pages: 187-196
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Abstract

A parametric study is conducted to investigate the effect of lead rubber bearing LRB isolator and ground motion characteristics on the response of seismic isolated bridges The purpose was to investigate the most favorable parameters of the LRB for minimum earthquake response of the isolated bridge system for different ground motions The important parameters included are ground motion characteristic by considering peak ground acceleration to peak ground velocity PGA/PGV ratio as damage index characteristic strength Q d of the LRB isolator normalized by the weight acting on the isolator flexibility of isolator by varying post yield time period T d and yield stiffness to post yield stiffness K u /K d ratio The performance of seismic isolated bridge is measured by the variation of maximum isolator displacement MID maximum isolator force MIF deck acceleration and pier base shear For a specified ground motion smaller MID and MIF are regarded as indicator of better seismic performance It is found that there exists a particular value of Q d /W T d and K u /K d for which the MID MIF deck acceleration and pier base shear attain the minimum values Finally the recommendations are made which are useful for the design engineers at the preliminary seismic isolation design of the bridges with LRB isolator for the ground motion having different characteristics

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