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Residual stresses and geometrical imperfections are important factors that affect the inelastic lateral-torsional buckling (LTB) capacity of flexural members. In this paper, the influence of the magnitudes of residual stresses and initial geometrical imperfections in the form of member out-of-straightness on the flexural resistance of steel delta girders (SDG) is investigated. Based on test data reported for welded plates and monosymmetric welded I -sections, a residual stress pattern for SDGdoi:10.18057/ijasc.2019.15.2.5 fatcat:vo7kyxrv7zenlayi4dwuxgyu4m