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Probabilistic seismic analysis of base isolated buildings considering near and far field earthquake ground motions
Structure and Infrastructure Engineering ( IF 3.7 ) Pub Date : 2020-12-06 , DOI: 10.1080/15732479.2020.1836000
Abhishikta Chanda 1 , Rama Debbarma 1
Affiliation  

Abstract

The present study aims at constructing an assembly of fragility curves which is a tool for probabilistic investigation of seismic responses for a six storey reinforced concrete base-isolated building, excited by near field (NF) and far field (FF) real ground motions, situated in plain terrain. For the sake of comparison, a similar fixed base building has been chosen. The base isolator adopted is a lead rubber bearing and the design parameters are in accordance to UBC-97. Fragility curves are derived using incremental dynamic analysis method. From the probabilistic demand model, maximum inter-storey drift ratio, maximum base shear and maximum top floor acceleration are computed as the damage parameters whose probability of exceedance (Pf) under predefined damage states for different intensities of earthquakes are recorded. The threshold values of intensity measure are estimated by performing linear regression. Fragility function results illustrated that fixed base buildings have a very high probability of failure in case of both NF and FF earthquakes, which is however, reduced by base isolator. Though the vulnerability of the base-isolated building was quite high for NF earthquakes, Pf for FF earthquakes was nearly negligible.



中文翻译:

考虑近场和远场地震地震动的基础隔震建筑物概率地震分析

摘要

本研究旨在构建易碎性曲线的集合,这是对由近场 (NF) 和远场 (FF) 真实地面运动激发的六层钢筋混凝土基础隔震建筑物的地震响应进行概率调查的工具,位于在平原地带。为了比较,选择了类似的固定基地建筑。基础隔振器采用铅橡胶支座,设计参数符合UBC-97。脆性曲线是使用增量动态分析方法得出的。从概率需求模型中,计算出最大层间漂移比、最大基础剪切和最大顶层加速度作为超过概率(P f) 在预定的破坏状态下记录不同强度的地震。通过执行线性回归估计强度度量的阈值。脆性函数结果表明,固定基础建筑物在 NF 和 FF 地震的情况下具有非常高的失效概率,但是通过基础隔震器降低了该概率。尽管基础隔震建筑物的脆弱性对于 NF 地震相当高,但对于 FF 地震的P f几乎可以忽略不计。

更新日期:2020-12-06
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