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原文传递 3D Beam Element for the Analysis of Torsional Problems of Steel-Structures in Fire

题名：	3D Beam Element for the Analysis of Torsional Problems of Steel-Structures in Fire
正文语种：	英文
作者：	Luca Possidente; Nicola Tondini, Ph.D.; Jean-Marc Battini
作者单位：	Univ, of Trento
关键词：	Finite-element analysis; 3D beam element; Torsion; Lateral-Torsional buckling; Torsional Buckling; Warping; Steel structures; Elevated temperature; Fire
摘要：	The paper presents the development of a three-dimensional (3D) beam element for the analysis of steel structures in fire that properly accounts for the degradation of the torsional strength and stiffness owing to thermal exposure. The element is well-suited for the analysis of members that are subjected to significant torsional effects, as steel members with open cross-sections subjected to torsion, lateral-torsional buckling, and torsional buckling. The element is based on a corotational formulation and small strains assumption, while the local formulation was developed according to both the Timoshenko and Bernoulli beam theories. The stress-strain relationship and thermal expansion of steel were implemented according to Eurocode EN 1993-1-2 (CEN 2005). A comprehensive numerical analysis was performed and results for several case studies are presented in the paper to assess the performance of the 3D beam element. The outcomes indicated very good agreement when compared with shell-based models, highlighting promising capabilities of modeling steel structures in fire. Moreover, the proposed element showed more accurate results with respect to beam elements included into two commercial software, i.e., ABAQUS and SAF1R.
出版日期：	2020
出版年：	2020
期刊名称：	Journal of Structural Engineering
卷：	Vol.146
期：	No.07
页码：	04020125