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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。
The accuracy and safety of the design criteria for the occurrence or absence of lateral torsional buckling of stainless steel beam-column joints in EC3 were evaluated. A large number of numerical parameters of H-beam-column joints with the same welding pattern were studied and evaluated as a basis. The effects of residual stress, cross-section aspect ratio, shape of moment diagram and grade of stainless steel were considered. A new design equation of stainless steel beam-column joint under fire is proposed. The calculated results are compared with the numerical results. The results show that the new design equation is safer than the design equation in EC3. In addition, the lateral torsional buckling of the stainless steel beam under the combined action of beam bending moment and lateral load was studied.