3D numerical analysis of reinforced concrete beams exposed to elevated temperature
3D numerical analysis of reinforced concrete beams exposed to elevated temperature
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DOI：
10.1016/j.engstruct.2012.11.030
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发表时间：
2014-01-01
影响因子：
5.5
通讯作者：
Sharma, Akanshu
中科院分区：
文献类型：
--
作者：
Ozbolt, Josko;Bosnjak, Josipa;Sharma, Akanshu
讨论了钢筋混凝土(RC)梁在高温和机械荷载作用下的性能的数值结果。研究中使用的模型是一个被实施到三维(3D)有限元(FE)程序中的三维热力模型。混凝土的力学本构关系为温度相关的微平面模型。所研究的钢筋混凝土梁的试验细节取自文献，并对相同的加载方案进行了数值模拟。分析了梁在无火灾荷载下的四点弯曲情况和火灾后三种不同曝光时间的情况。分析了高温和机械载荷作用下梁的荷载-挠度曲线、温度场、应变和应力以及裂纹形态(损伤)，并与试验结果进行了比较。结果表明，所采用的数值模拟技术能够较好地预测钢筋混凝土梁在机械荷载、火灾及火灾后机械荷载作用下的受力性能。因此，所使用的三维热力模型对于预测混凝土和RC结构在高温下的行为是一种有用的数值工具。(C)2012爱思唯尔有限公司。保留所有权利。
Numerical results of the behaviour of reinforced concrete (RC) beams subjected to elevated temperatures followed by mechanical loading are discussed. The model used in the study is a transient three-dimensional thermo-mechanical model that was implemented into a three-dimensional (3D) finite element (FE) code. The mechanical constitutive law for concrete is the temperature dependent microplane model. The experimental details of the investigated RC beams are taken from the literature and the same loading scenarios are numerically simulated. The beams are analysed for the case of four-point bending with no fire load and for the post fire cases with three different exposure times. The numerically predicted load-deflection curves, temperature fields, strains and stresses and crack patterns (damage) of the beams exposed to high temperature and mechanical load are analysed and compared with the experimental results. It is shown that the employed numerical modeling technique can successfully predict the behaviour of the RC beams under mechanical load, fire and fire followed by mechanical load. Therefore, the used 3D thermo-mechanical model is useful numerical tool for the realistic prediction of the behaviour of concrete and RC structures exposed to high temperature. (C) 2012 Elsevier Ltd. All rights reserved.