Geometric Nonlinear Model of Thin-walled Spatial Steel Frames


G. J. Nie , Z. Zhong Key Laboratory of Solid Mechanics of MOE, Tongji University, Shanghai, 200092, China


<正> Thin-walled spatial steel frames are widely used in buildings. In spite of having relatively stronger stiffness than concrete, the steel structures are predominantly affected by instability due to the buckling of structural members composed of very slender plates. In order to use thin-walled structures effectively, an understanding of all the deformations and stresses caused by flexure and torsion is required. While the thin-walled beam generates the torsion deformation, it is usually accompanied by the warping deformation. If the warping deformation is restrained, the normal stress and shearing stress caused by warping will generate in the beam. At the same time the additional warping shearing strain will affect the warping deformation again. So it is necessary to introduce the warping deformation as the independent degree of freedom during the finite element analysis of thin-walled spatial steel frames and it is essential to consider the second order effect of axial force, shearing force, biaxial bending moment and bimoment in the geometric nonlinear model of thin-walled element.


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Total: 3 articles

  • [1] H.G. Kwak, ;D. Y. Kim, ;H. W. Lee, Effect of warping in geometric nonlinear analysis of spatial beams, Journal of constructional steel research,
  • [2] G. J. Nie, Research on the nonlinear analytical model and analytical methods of spatial steel member structures,
  • [3] H. Shakourzadeh, ;Y. Q. Guo,; J. L. Batoz, A torsion bending element for thin-walled open and closed cross sections, Comput. & Struct,

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