Abstract Numerous experiments have been conducted to investigate the mechanical properties of structural steels at elevated temperatures, including mild steel and high strength steel (HSS). However, material models in the current mainstream fire design standards are mainly based on results of mild steel, and hence their applicability to HSS is questionable. In this paper, test data in literatures on mechanical properties of hot-rolled carbon structural steels with strength grades from 235 MPa to 960 MPa at elevated temperatures were comprehensively summarized. The effects of steel manufacturing process, test method, heating rate, and loading rate on the performance of structural steels at elevated temperatures were analysed. It is found that for steels with all the considered grades, reduction factors of the nominal strength specified with 2.0% of strain have similar downward trends. However, downward trends of the reduction factors of Young's modulus, ultimate strength and 0.2% offset yield strength vary with the steel grade. The manufacturing process, test method, heating rate and loading rate all have certain effects on the mechanical properties of steel at elevated temperatures, but the effects on the reduction factors of strength are generally slight. Finally, recommendations on the future research were proposed.

中文翻译：

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高温下热轧结构钢的力学性能：综述

摘要 已经进行了大量实验来研究结构钢在高温下的机械性能，包括低碳钢和高强度钢 (HSS)。然而，目前主流的防火设计标准中的材料模型主要基于低碳钢的结果，因此其对高速钢的适用性值得怀疑。本文综合总结了文献中关于强度等级为235～960MPa的热轧碳素结构钢高温力学性能的试验数据。分析了钢的制造工艺、试验方法、加热速率和加载速率对结构钢在高温下性能的影响。发现对于所有考虑牌号的钢，公称强度的折减系数用 2 表示。0% 的应变具有类似的下降趋势。然而，杨氏模量、极限强度和0.2%偏置屈服强度的折减系数的下降趋势因钢种而异。制造工艺、试验方法、加热速率和加载速率对钢在高温下的力学性能都有一定的影响，但对强度折减系数的影响一般较小。最后，对未来的研究提出了建议。但对强度折减系数的影响一般较小。最后，对未来的研究提出了建议。但对强度折减系数的影响一般较小。最后，对未来的研究提出了建议。