Comparative Analysis of Lead Heating Effects on Lead Rubber Bearing Behaviours

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (10) : 182-189.

Chuan Qin 1 Wenguang Liu1 Wenfu He 1 Qiaorong Yang 1

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Abstract

This paper presents a comparison of different evaluation approaches on lead rubber bearing (LRB) behaviors through horizontal shear tests. Compared to constant lead yield stress value, cumulative plastic deformation demands on LRBs arise obviously with lead core heating effects considered. Nonlinear response history analyses were performed to study lead core heating effects on LRB behaviors and seismic responses, using three sets of ground motions classified according to their site categories. The results demonstrate that lead yield stresses decrease apparently with seismic input level arises in all three motion sets, while plastic deformation cumulating and lead core temperature arising. It is also revealed that, for medium hard site and rock site, Chinese code value of lead core yield stress is less than seismic analysis values, which leads to overestimate of bearing displacement responses and underestimate of shear force responses, and accurate seismic responses could not be predicted using it.

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lead rubber bearing / heating effect / yield stress / isolation behaviors

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Chuan Qin 1 Wenguang Liu1 Wenfu He 1 Qiaorong Yang 1. Comparative Analysis of Lead Heating Effects on Lead Rubber Bearing Behaviours[J]. Journal of Vibration and Shock, 2017, 36(10): 182-189

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