- Volume 43 Issue 4
Finite element buckling analysis of insulated transition flue ducts is carried out to determine the critical buckling load multipliers when subjected to axial compression for design process. Through this investigation, the results of numerical computations to examine the buckling strength for different possible duct shapes (cylinder, and circular-to-square) are presented. The load multipliers are determined through detailed buckling analysis taking into account the effects of geometrical construction and duct plate thickness which have great influence on the buckling load. Enhancement in the buckling capacity of such ducts by the addition of horizontal and vertical stiffeners is also investigated. Several models with varying dimensions and plate thicknesses are examined to obtain the linear buckling capacities against duct dimensions. The percentage improvement in the buckling capacity due to the addition of vertical stiffeners and horizontal Stiffeners is shown to be as high as three times for some cases. The study suggests that the best location of the horizontal stiffener is at 0.25 of duct depth from the bottom to achieve the maximum buckling capacity. A design equation estimating the buckling strength of geometrically perfect cylindrical-to-square shell is developed by using regression analysis accurately with approximately 4% errors.
- ANSYS 9.0, Swanson Analysis Systems, Inc, Houston, PA.
- Aljawi, A.A., Rabou, M. and Asiri, S. (2004), "Finite element and experimental analysis of square tubes under dynamic axial crushing", Proceedings of the European Congress on Methods in Applied Sciences and Engineering, (ECCOMAS), Jyvaskyla, July.
- Cai, M., Mark, J. and Rotter, J. (2003), "Parametric study on the buckling of thin steel cylindrical shells under elevated local axial compression stresses", Proceedings of the 6th ASCE Engineering Mechanics Conference, Seatle.
- Khamlichi, A., Bezzazi, M. and Limam, A. (2004), "Buckling of elastic cylindrical shells considering the effect of localized axisymmetric imperfections", Thin Wall. Struct., 42, 1035-1047. https://doi.org/10.1016/j.tws.2004.03.008
- Khelil (2002), "Buckling of steel shells subjected to non-uniform axial and pressure loadings", Thin Wall. Struct., 40, 955-970. https://doi.org/10.1016/S0263-8231(02)00040-X
- Koiter, W.T. (2001), "Elastic stability and post-buckling behaviour", J. Struct. Eng., ASCE, 127(10), 1129-1136. https://doi.org/10.1061/(ASCE)0733-9445(2001)127:10(1129)
- Lavasani, A. (2009), "Simple solutions for buckling of conical shells composed of functionally graded materials", J. Solid Mech., 1(2), 108-117.
- Seung, E.K. and Chang, S.K. (2002), "Buckling strength of the cylindrical shell and tank subjected to axially compressive loads", Thin Wall. Struct., 40, 329-353. https://doi.org/10.1016/S0263-8231(01)00066-0
- Schiender, W. and Brede, A. (2005), "Consistent equivalent geometric imperfections for the numerical buckling strength verification of cylindrical shells under uniform external pressure", Thin Wall. Struct., 43, 175-188. https://doi.org/10.1016/j.tws.2004.08.006
- Shen, H.S. and Li, Q.S. (2002), "Thermo mechanical post buckling of shear deformable laminated cylindrical shells with local geometric imperfections", Int. J. Solids Struct., 39, 4525-4542. https://doi.org/10.1016/S0020-7683(02)00351-7
- Song, C.Y., Teng, J.G. and Rotter, J.M. (2004), "Imperfections sensitivity of thin elastic cylindrical shells subjected to axial compression", Int. J. Solids Struct., 41, 7155-7180. https://doi.org/10.1016/j.ijsolstr.2004.05.040
- Teng, J.G. and Song, C.Y. (2001), "Numerical models for nonlinear analysis of elastic shells with eigen modeaffine imperfections", Int. J. Solids Struct., 38, 3263-3280. https://doi.org/10.1016/S0020-7683(00)00222-5
- Timoshenko, S.P. and Gere, J.M. (1959), Theory of Plates and Shells, 2nd Edition, McGraw-Hill Book Company, New York.
- Zhu, Y.A. (2007), "Finite element Analysis of structural steel elliptical hollow sections in compression", Centre of Advanced Structural Engineering-sydney, Research Report R-874.