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    NAM-IL KIM

    ABSTRACT
    An improved numerical method to exactly evaluate 14×14 dynamic and static element stiffness matrices is proposed for the spatial free vibration and stability analysis of nonsymmetric thin-walled straight beams subjected to eccentrically... more
    An improved numerical method to exactly evaluate 14×14 dynamic and static element stiffness matrices is proposed for the spatial free vibration and stability analysis of nonsymmetric thin-walled straight beams subjected to eccentrically axial loads. Firstly equations of motion and force-deformation relations are rigorously derived from the total potential energy for a uniform beam element with nonsymmetric thin-walled cross-section. Next a
    ... Nam-Il Kim a , Kwang-Jin Seo b and Moon-Young Kim Corresponding Author Contact Information , E-mail The Corresponding Author , a. ... b Korea Engineering Consultants Corporation, Shinsa-dong, Gangman-gu, Seoul 135-790, South Korea. ...
    For spatial free vibration of shear deformable circular curved beams with non-symmetric thin-walled cross-sections, an improved vibration theory is proposed. The elastic strain and kinetic energies are first derived by considering... more
    For spatial free vibration of shear deformable circular curved beams with non-symmetric thin-walled cross-sections, an improved vibration theory is proposed. The elastic strain and kinetic energies are first derived by considering constant curvature effects and shear deformation effects due to shear forces and restrained warping torsion. Next equilibrium equations and force–deformation relations are obtained using a stationary condition of total
    A simple but efficient method to evaluate the exact element stiffness matrix is newly presented in order to perform the spatially coupled stability analysis of thin-walled composite beams with symmetric and arbitrary laminations subjected... more
    A simple but efficient method to evaluate the exact element stiffness matrix is newly presented in order to perform the spatially coupled stability analysis of thin-walled composite beams with symmetric and arbitrary laminations subjected to a compressive force. For this, the general bifurcation-type buckling theory of thin-walled composite beam is developed based on the energy functional, which is consistently obtained