Shear resistance and design of stainless steel plate girders in fire
Shear resistance and design of stainless steel plate girders in fire
复制标题
DOI：
10.1016/j.engstruct.2022.115331
复制
发表时间：
2023-02
影响因子：
5.5
通讯作者：
M. Kucukler
中科院分区：
文献类型：
--
作者：
M. Kucukler
本文对高温下不锈钢板梁的抗剪性能和设计进行了研究。考虑了影响不锈钢板梁在火灾中的结构响应的各种参数，考虑了（i）奥氏体和双相不锈钢等级，（ii）刚性和非刚性端柱，（iii）板梁未加劲部分的不同纵横比，（iv）各种腹板细长度和（v）不同的高温水平。这些参数的不锈钢板梁在高温下的行为的影响。目前，在欧洲钢结构防火设计标准EN 1993-1-2中，没有关于不锈钢板梁防火设计的具体设计规则。考虑到这一点，与不锈钢的高温材料性能的欧洲结构不锈钢设计标准EN 1993-1-4的室温不锈钢板梁的设计建议的准确性进行评估。结果表明，这种方法导致不安全的和分散的极限强度估计不锈钢板梁在火灾中。根据EN 1993-1-2和EN 1993-1-4的现有设计规定，提出了不锈钢板梁的新防火设计建议。提出的新设计建议的准确性和安全性进行了全面验证，对非线性有限元建模的结果。
In this paper, the shear resistance and design of stainless steel plate girders at elevated temperatures are investigated. A broad range of parameters influencing the structural response of stainless steel plate girders in fire are taken into account, considering (i) austenitic and duplex stainless steel grades, (ii) rigid and non-rigid end posts, (iii) different aspect ratios for the unstiffened portions of the plate girders, (iv) various web slendernesses and (v) different elevated temperature levels. The influence of these parameters on the behaviour of stainless steel plate girders at elevated temperatures is considered. Currently, there is an absence of specific design rules on the fire design of stainless steel plate girders in the European structural steel fire design standard EN 1993-1-2. Considering this, an accuracy assessment of the room temperature stainless steel plate girder design recommendations of the European structural stainless steel design standard EN 1993-1-4 applied with the elevated temperature material properties of stainless steel is performed. The results indicate that this approach leads to unsafe and scattered ultimate strength estimations for stainless steel plate girders in fire. New fire design recommendations for stainless steel plate girders that are in accordance with the existing design provisions of EN 1993-1-2 and EN 1993-1-4 are proposed. The accuracy and safety of the proposed new design recommendations are comprehensively verified against the results from nonlinear finite element modelling.