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Research Article

Response of an isolated structure with deteriorating hysteretic isolator model

Gökhan Özdemir*1, Beyhan Bayhan2

1Anadolu University, Department of Civil Engineering, Turkey

2Bursa Technical University, Department of Civil Engineering, Turkey



Lead rubber bearing, 

Isolator model, 

Bounding analysis, 

Lead core heating

Cyclic motion of lead rubber bearings (LRBs) leads to increasing temperature in lead core initiating the reduction in strength of LRB. This reduction results in a deteriorating bi-linear force deformation relation for LRB. In this study, response of LRBs (with deteriorating hysteresis loops due to temperature change) subjected to near-field ground motions with distinct pulse-type behavior is studied. Ground motions are applied bi-directionally and LRBs are modeled with due consideration of coupled behavior in the two orthogonal horizontal directions. Response of LRBs with deteriorating hysteresis is compared with that of non-deteriorating ones by considering bounding analyses (upper and lower bound). Thus, nonlinear response history analyses are performed for each selected ground motion record. Bounding analyses result in over predicted displacement demands for LRBs compared to results obtained by implemented deteriorating bi-linear LRB model. By means of new deteriorating model, engineers may come up with more efficient isolation system designs.

© 2015 MIM Research Group. All rights reserved.

DOI:                                       Full Text


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