Cross-section resistance and design of stainless steel CHS and EHS at elevated temperatures

Cross-section resistance and design of stainless steel CHS and EHS at elevated temperatures
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高温下不锈钢 CHS 和 EHS 的截面电阻和设计

DOI:
10.1016/j.engstruct.2023.115996
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发表时间:
2023
影响因子:
5.5
通讯作者:
Quan C
Quan C
中科院分区:
工程技术2区
文献类型:
--
作者:
Quan C

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本文研究了不锈钢圆管和椭圆管在高温下的结构性能和设计。建立了不锈钢CHS和EHS的壳体有限元模型,并根据文献中的实验结果进行了验证,这些实验结果随后用于生成基准结构性能数据。对大量在高温下经受(i)纯轴向压缩、(ii)纯弯曲、(iii)轴向压缩和弯曲组合以及(iv)弯曲和剪切组合的冷成型和热轧奥氏体、双相和铁素体不锈钢CHS和EHS进行参数研究;所研究的案例包括火灾中的24,495不锈钢CHS和EHS,并涵盖了广泛的横截面细长度和高温水平。校准对基准结构性能数据从数值参数研究中获得的,新的设计建议,预测截面电阻的不锈钢CHS和EHS在火灾中提出。对新设计方案的准确性、安全性和可靠性进行了评估。结果表明,在欧洲结构钢防火设计标准EN 1993-1-2的设计规定相比,所提出的设计方法提供更准确和安全的截面电阻预测不锈钢CHS和EHS在高温下。
The structural behaviour and design of stainless steel circular hollow sections (CHS) and elliptical hollow sections (EHS) at elevated temperatures are investigated in this paper. Shell finite element models of stainless steel CHS and EHS are created and validated against experimental results from the literature, which are subsequently used to generate benchmark structural performance data. Parametric studies are performed on a large number of cold-formed and hot-rolled austenitic, duplex and ferritic stainless steel CHS and EHS subjected to (i) pure axial compression, (ii) pure bending, (iii) combined axial compression and bending and (iv) combined bending and shear at elevated temperatures; the studied cases comprise 24,495 stainless steel CHS and EHS in fire and cover a wide range of cross-section slendernesses and elevated temperature levels. Calibrated against the benchmark structural performance data obtained from the numerical parametric studies, new design proposals for predicting the cross-section resistances of stainless steel CHS and EHS in fire are put forward. The accuracy, safety and reliability of the new design proposals are assessed. It is shown that in comparison to the design provisions of the European structural steel fire design standard EN 1993-1-2, the proposed design methods provide more accurate and safe-sided cross-section resistance predictions for stainless steel CHS and EHS at elevated temperatures.
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