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Behaviour during seismic aftershocks of r.c. base-isolated framed structure with fire-induced damage

机译：钢筋混凝土余震过程中的行为火灾引起的破坏的基础隔离框架结构

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摘要

Fire following strong earthquakes is considered a very high-risk event and a fire-damaged structure could be subjected to seismic aftershocks. Most probably damage produced by the main shock will be absent in case a base-isolation system is adopted. To study the post-fire seismic performance a numerical study is presented on six-storey reinforced concrete (r.c.) framed structures, composed of a basement with elastomeric bearings and five storeys above the ground level. Three fire scenarios are compared, selecting the base-isolated level (i.e. F0) and first (i.e. F1) and fifth (i.e. F5) levels of the superstructure as fire compartments. A reduction of the mechanical properties of the fire-damaged elastomeric bearings is considered in accordance with a proposed 200 degrees C isotherm method. To this end, transient response of the elastomeric bearings corresponding to the Eurocode 1 time-temperature curve, is compared with steady response, defined as a heat conduction problem of a constant flux in an infinite circular cylinder. Reduced mechanical properties of r.c. cross-sections are considered by means of a thermal-mechanical mapping analysis, in accordance with the 500 degrees C isotherm method in the Eurocode 2. The nonlinear seismic analysis is performed by using a lumped plasticity model to describe the inelastic behaviour of the r.c. frame members; a nonlinear force-displacement law is considered for the elastomeric bearings, with coupling of horizontal and vertical motions. Near-fault seismic aftershocks, inducing severe demand in base-isolated buildings, are scaled within an incremental dynamic analysis procedure. (c) 2017 Elsevier Ltd. All rights reserved.
机译：强烈地震后发生的火灾被认为是非常危险的事件，火灾造成的建筑物可能会遭受地震余震。如果采用基本隔离系统，则最可能不会发生由主震动产生的损坏。为了研究火灾后的抗震性能，对六层钢筋混凝土框架结构进行了数值研究，该框架结构由带有弹性轴承的地下室和地上五层组成。比较了三种火灾场景，选择了上层建筑的基础隔离层（即F0），第一层（即F1）和第五层（即F5）作为防火区。根据提出的200℃等温线方法，考虑了损坏的弹性体轴承的机械性能的降低。为此，将对应于Eurocode 1时间-温度曲线的弹性轴承的瞬态响应与稳态响应进行比较，稳态响应被定义为无限圆柱中恒定通量的导热问题。降低的机械性能根据欧洲规范2中的500摄氏度等温线法，通过热机械映射分析来考虑横截面。通过使用集总可塑性模型描述RC的非弹性行为来进行非线性地震分析。框架成员；考虑到水平和垂直运动的耦合，弹性体轴承考虑了非线性力-位移规律。在逐步隔离的地震分析余震中，激增了对基础隔离建筑的需求，并在增量动态分析过程中进行了缩放。 （c）2017 Elsevier Ltd.保留所有权利。

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