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논문 기본 정보

자료유형
학술저널
저자정보
Selcuk Bas (Bartin University) 신상화 (부산가톨릭대학교)
저널정보
국제구조공학회 Steel and Composite Structures, An International Journal Steel and Composite Structures, An International Journal Vol.30 No.5
발행연도
2019.1
수록면
483 - 492 (10page)

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초록· 키워드

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In the current study, the influence of the initial lateral (sweep) shape and the cross-sectional twist imperfection on the lateral torsional buckling (LTB) response of doubly-symmetric steel I-beams was investigated. The material imperfection (residual stress) was not considered. For this objective, standard European IPN 300 beam with different unbraced span was numerically analyzed for three imperfection cases: (i) no sweep and no twist (perfect); (ii) three different shapes of global sweep (half-sine, full-sine and full-parabola between the end supports); and (iii) the combination of three different sweeps with initial sinusoidal twist along the beam. The first comparison was done between the results of numerical analyses (FEM) and both a theoretical solution and the code lateral torsional buckling formulations (EC3 and AISC-LRFD). These results with no imperfection effects were then separately compared with three different shapes of global sweep and the presence of initial twist in these sweep shapes. Besides, the effects of the shapes of initial global sweep and the inclusion of sinusoidal twist on the critical buckling load of the beams were investigated to unveil which parameter was considerably effective on LTB response. The most compatible outcomes for the perfect beams was obtained from the AISC-LRFD formulation; however, the EC-3 formulation estimated the Pcr load conservatively. The high difference from the EC-3 formulation was predicted to directly originate from the initial imperfection reduction factor and high safety factor in its formulation. Due to no consideration of geometric imperfection in the AISC-LFRD code solution and the theoretical formulation, the need to develop a practical imperfection reduction factor for AISC-LRFD and theoretical formulation was underlined. Initial imperfections were obtained to be more influential on the buckling load, as the unbraced length of a beam approached to the elastic limit unbraced length (Lr). Mode-compatible initial imperfection shapes should be taken into account in the design and analysis stages of the I-beam to properly estimate the geometric imperfection influence on the Pcr load. Sweep and sweep–twist imperfections led to 10% and 15% decrease in the Pcr load, respectively, thus; well-estimated sweep and twist imperfections should considered in the LTB of doubly-symmetric steel I-beams.
#lateral torsional buckling #initial geometric imperfection #doubly-symmetric steel I-beam #finite elementmodel

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참고문헌 (40)

참고문헌 신청
ABAQUS / 2017 / Standard User’s Manual / Dassault Systèmes google schola Agüero, A. / 2015 / Equivalent geometric imperfection definition in steel structures sensitive to flexural and/or torsional buckling due to compression / Eng. Struct 96:160~177 google schola AISC-LRFD / 2016 / Specification for structural steel buildings; American Institute of Steel Construction google schola 2016 / AS4100-1998, Steel structures; Standards Association of Australia google schola R. Aydin / 2015 / On the evaluation of critical lateral buckling loads of prismatic steel beams / Steel and Composite Structures, An International Journal 18(3):603~621 dbpia

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