A finite-element method for the analysis of tubular member stability under combined external pressure and structural loads is presented. For the purposes of research, a tube element is developed. While polynomial interpolation is employed in the longitudinal direction, Fourier series expansions of the displacement components are adopted at the nodal cross sections. The formulation accounts for large inelastic deformation and recognizes initial imperfections and residual stresses. Arc-length procedures are implemented to trace unstable equilibrium paths. A simple, yet effective estimate of the contribution of external pressure to the tube element stiffness matrix--particularly significant in the analysis of slender tubes--is included. The authors report and discuss the preliminary results regarding the behavior of tubular members subjected to pressure and bending. Summarized are the effects of initial imperfections and residual stresses on the response to pressure along with bending. Finally, the influence of residual stresses on thrust-moment interaction in tubular beam-columns is explored briefly.


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  • Accession Number: 00715341
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 12 1996 12:00AM