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LATERAL-TORSIONAL BUCKLING TESTS OF WELDED I-GIRDERS UNDER MOMENT GRADIENT

Yuhshi Fukumoto, Kouji Maegawa, Yoshito Itoh, Yoshiyuki ASARI

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Abstract

This paper presents the experimental researches on the lateral-torsional buckling behavior of welded steel girders. The test program was designed to clarify the effect of moment gradient in the inelastic range. Test results, including material properties, residual stress distributions and initial lack of straightness of compressive flange and web panels, are presented. The experimental ultimate load-carrying capacity of girders is compared with the analytical predictions by the finite displacement theory. The lateral-torsional strengths of welded girders under moment gradient are then proposed by a simple formula.

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What this paper is about

This paper presents the experimental researches on the lateral-torsional buckling behavior of welded steel girders. The test program was designed to clarify the effect of moment gradient in the inelastic range. Test results, including material properties, residual stress distributions and initial lack of straightness of compressive flange and web panels, are presented. The experimental ultimate load-carrying capacity of girders is compared with the analytical predictions by the finite displacement theory. The lateral-torsional strengths of welded girders under moment gradient are then proposed by a simple formula.

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Available abstract

This paper presents the experimental researches on the lateral-torsional buckling behavior of welded steel girders. The test program was designed to clarify the effect of moment gradient in the inelastic range. Test results, including material properties, residual stress distributions and initial lack of straightness of compressive flange and web panels, are presented. The experimental ultimate load-carrying capacity of girders is compared with the analytical predictions by the finite displacement theory. The lateral-torsional strengths of welded girders under moment gradient are then proposed by a simple formula.

Key concepts: Girder, Flange, Structural engineering, Buckling, Welding, Residual stress, Moment (physics), Materials science

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