Elastic-plastic stability analysis of steel compression members considering SD effect and initial defects
LI Bin
LI Chuanxi
LIU Xuesong
ZHANG Yuping
Abstract：Considering the initial imperfections of steel compression members,such as initial de-formation and initial eccentricity,and the difference of tension and compression strength of steel,the formula for calculating ultimate load of steel compression members under elastic-plastic buck-ling failure caused by axial eccentric load is derived by the Ježek method.The approximate calcu-lation formula of elastic-plastic ultimate load of a rectangular section steel compression member with two ends simply supported is obtained through studying the influences of strength difference(SD)effect,slenderness and initial defects on ultimate load of elastic-plastic buckling failure of steel compression members.The analytical solution and approximate calculation formula in this paper can be used to solve the elastic-plastic limit load of the steel compression members with ini-tial bending,steel compression members with initial eccentric,ideal center compression members or beam-columns considering SD effect.The results show that the elastic-plastic ultimate load of steel compression members increases by 10.5%～12.2%when SD effect is considered.Therefore,the strength of steel compression members can be fully played when SD effect is considered in practical engineering.
Keywords：steel compression memberultimate loadelastic-plastic stabilitySD effectinitial defectformular fitting
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 90-95 )