火灾下不锈钢梁—柱节点数值分析

评估了EC3中不锈钢梁-柱节点发生或不发生侧向扭转屈曲的设计准则的准确性和安全性。对焊接方式相同的H型钢梁-柱节点进行了大量数值参数研究,以此为基础进行评估。研究中考虑了残余应力、截面高厚比、弯矩图形状和不锈钢等级的影响。提出了火灾下不锈钢梁-柱节点的新设计方程,计算结果与数值分析结果进行对比,结果表明,新设计方程比EC3中设计方程更为安全。此外,对火灾时不锈钢梁在梁端弯矩与横向荷载共同作用下的侧向扭转屈曲进行了研究。

Numerical Analysis of Stainless Steel Beam-Columns in Case of Fire

This paper presents an evaluation of the accuracy and safety of the design rules from Eurocode 3, for the fire resistance of stainless steel beam-columns, with and without lateral-torsional buckling. These evaluations are carried out performing an extensive numerical parametric study on beam-columns with equivalent welded H-cross-sections. In this study the influences of the residual stresses, the cross-sectional slenderness, the shape of the bending moment diagrams and the stainless steel grade are considered. New proposals for the design equations of stainless steel beam-columns in case of fire are presented. These proposals revealed to be safer than the design equations of Eurocode 3 when compared with numerical results. Additionally, the lateral-torsional buckling of stainless steel beams subjected to combined end moments and transverse loads in case of fire is also studied.