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首页> 外文期刊>Bulletin of earthquake engineering >Amplification in maximum isolator displacement of an LRB isolated building due to mass eccentricity
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Amplification in maximum isolator displacement of an LRB isolated building due to mass eccentricity

机译：Amplification in maximum isolator displacement of an LRB isolated building due to mass eccentricity

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The present study focuses on the amplification of maximum isolator displacements due to torsion in a structure seismically isolated by lead rubber bearings (LRBs). Mass eccentricities equal to 5%, 10% and 20% are introduced to the superstructure and the 3D building model is subjected to a set of bidirectional ground motion excitations. To perform nonlinear response history analyses (NRHA) at the design level, eleven near-field record pairs are selected and rotated to their maximum directions and then scaled to get compatible with the target spectrum. In the analyses, two different force-displacement curves (deteriorating and non-deteriorating) are used to model the hysteretic behavior of LRBs and quantify the modeling effect on torsional amplification of isolator displacements. NRHA are conducted for both eccentric and non-eccentric structural models. Moreover, different isolation periods and characteristic strength to weight ratios are considered in the analyses. Once the torsional amplifications in maximum isolator displacement are obtained, they are compared to the ones estimated by the simplified equations provided in ASCE 7-10 and ASCE 7-16. The findings show that the use of the non-deteriorating constitutional model for LRBs results in larger torsional amplifications in isolator displacements, compared to the non-deteriorating one. The estimated ASCE 7-16 torsional amplifications are almost identical to the ones provided by NRHA for 5% eccentricity when the non-deteriorating hysteretic model is considered for LRB.

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