Abstract: Stainless steel bolts are increasingly used in bolted semi-rigid connections due to their remarkable durability, ductility, and fire resistance. Stainless steel bolts, like their base material (stainless steel bars), exhibit smooth non-linear characteristics at both ambient and elevated temperatures, and they do not have a well-defined yield point in their stress-strain curves. This material behavior can be analytically represented by different material models, the most popular of which is based on the Ramberg-Osgood formulation or its extensions thereof. However, the available prediction formulas for the associated parameters in the material model of stainless steels are not necessarily applicable to austenitic and duplex stainless steel bolts subjected to work-hardening and cold-forging processes. Therefore, this paper proposes a nonlinear elevated tempe-rature constitutive model for stainless steel bolts based on their high-temperature reduction factors from previous studies. Supposing that five mechanical parameters (Young's modulus, proportional limit, yield strength, ultimate strength, and ultimate strain) are given at ambient temperature, and the reduction formulas derived for stainless steel bolts is used to obtain five mechanical parameters at a specified temperature and to evaluate the correlation of the tested stress-strain curve with the predicted one. This prediction methodology shows that the predicted curve is in clear agreement with the tested one, which is shown to be that the elevated temperature material model based on the reduction factor has consi-derable prediction accuracy. Thus, a stress-strain curve at a given temperature can be predicted based on five mechanical parameters at ambient temperature by combining the elevated temperature reduction equations for stainless steel bolts.
通讯作者:
*王辉,中国人民解放军陆军勤务学院讲师。2022年6月取得重庆大学土木工程专业博士学位,主要从事钢结构及其抗火性能的研究。近年来在专业领域SCI和EI期刊发表8篇论文,包括Engineering Structures、Fire Safety Journal、Journal of Materials in Civil Engineering、Thin-walled Structures、Journal of Construction Steel Research、《建筑结构学报》等。 wunghui@hotmail.com
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2024, Vol. 38 
