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原文传递 Stability Design of Stainless Steel Structures

题名：	Stability Design of Stainless Steel Structures
正文语种：	eng
作者：	Walport, F.;Kucukler, M.;Gardner, L.
作者单位：	Imperial Coll London Dept Civil & Environm Engn London SW7 2AZ England;Univ Warwick Sch Engn Coventry CV4 7AL W Midlands England;Imperial Coll London Dept Civil & Environm Engn London SW7 2AZ England
关键词：	AISC 370;Inelastic buckling;Stability;Stainless steel;Stiffness reduction;Structural design
摘要：	The direct analysis method (DAM), featuring second-order elastic analysis with two stiffness reduction factors (tau(b) and tau(g)), is the primary means of stability design for steel structures in AISC 360 and AISI S100. The equivalent provisions for stainless steel structures, which are due to be incorporated into the upcoming AISC 370 and ASCE-8 specifications, are developed in this paper. Stainless steel exhibits a rounded stress-strain response, typically described by the Ramberg-Osgood formulation. The slope of this function (i.e., the tangent modulus), adjusted to consider the influence of residual stresses, is used to define the stiffness reduction factor tau(b) at a given axial load level to be applied to members in compression to allow for the adverse influence of the spread of plasticity and residual stresses. The dependency of the degree of stiffness reduction on the roundedness of the stress-strain curve, which varies between the different grades of stainless steel is also directly captured through the strain hardening exponent n that features in the Ramberg-Osgood formulation. Values of 0.7 for AISC 370 and 0.9 for ASCE-8 are proposed for the general stiffness reduction factor tau(g) to be applied to all member stiffnesses to account for the development and spread of plasticity, and to ensure a suitable reduction in stiffness for slender members with low axial load levels. The different tau(g) values between the two specifications are required to reflect the different buckling curves and axial-bending interaction expressions employed. The accuracy of the proposed method for the design of stainless steel members and frames is assessed through comparisons with benchmark shell finite-element results. Comparisons are also made against the new provisions in AISC 370 for design by second-order inelastic analysis. The reliability of the design proposals is demonstrated through statistical analyses, where it is shown that a resistance factor phi of 0.9 can be adopted. (C) 2021 American Society of Civil Engineers.
出版年：	2022
期刊名称：	Journal of structural engineering
卷：	148
期：	1
页码：	04021225.1-04021225.19