Abstract
A ring-stiffened slightly conical shell is optimized for external pressure according to the design rules of Det Norske Veritas. The whole length and the different two end radii are given. The shell is divided into n equidistant segments with one stiffener in each segment. Each segment has a different shell thickness determined using a buckling constraint, and each ring-stiffener of welded square box section is designed by means of the required moment of inertia. The optimal number of shell segments (n opt) is determined by means of costs calculated for a series of n. The cost function includes the material, fabrication and painting costs. The shell normal stresses are determined also by finite element method.
Similar content being viewed by others
References
Klöppel K., Motzel E.: Traglastversuche an stählernen, unversteiften und ringversteiften Kegelstumpfschalen — Teil 1: Versuchsbericht, Stahlbau 45, 1976, No. 10. pp. 289–301.
Rao S.S., Reddy E.S.: Optimum design of stiffened conical shells with natural frequency constraints, Computers & Structures 14, 1981, No. 1–2, pp. 103–110.
Ellinas C.P., Supple W.J., Walker A.C.: Buckling of offshore structures, London, etc. Granada Publ., 1984.
Spagnoli A.: Buckling behaviour and design of stiffened conical shells under axial compression, PhD thesis, University of London, London, 1997.
Spagnoli A., Chryssanthopoulos M.K.: Buckling design of stringer-stiffened conical shells in compression, J. Struct. Eng. ASCE 125, 1999a, No.1. pp. 40–48.
Spagnoli A., Chryssanthopoulos M.K.: Elastic buckling and postbuckling behaviour of widely-stiffened conical shells under axial compression, Eng. Struct., 1999b, 21, No. 9, pp. 845–855.
Spagnoli A.: Different buckling modes in axially stiffened conical shells, Eng. Struct., 2001, 23, No. 8, pp. 957–965.
Chryssanthopoulos M.K., Poggi C., Spagnoli A.: Buckling design of conical shells based on validated numerical models, Thin-walled Struct., 1998, 31, No. 1–3, pp. 257–270.
Singer J., Arbocz J., Weller T.: Buckling experiments: experimental methods in buckling of thin-walled structures. Vol. 2.: Shells, built-up structures, composites and additional topics, New York, Wiley & Sons, 2002.
Farkas J., Jármai K., Snyman J.A., Gondos Gy.: Minimum cost design of ring-stiffened welded steel cylindrical shells subject to external pressure, Proc. 3rd European Conf. Steel Structures, Coimbra, 2002, eds. Lamas A. and Simoes da Silva, L. Universidade de Coimbra, 2002, pp. 513–522.
Farkas J., Jármai K.: Economic design of metal structures, Rotterdam, Millpress, 2003.
Det Norske Veritas (DNV) Buckling strength analysis. Classification Notes No. 30.1. Høvik, Norway, 1995.
Det Norske Veritas: Buckling strength of shells — Recommended Practice DNV-RP-C202, Høvik, Norway, 2002.
Eurocode 3:2002, Design of steel structures — Part 1–1: General structural rules, Brussels, CEN.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Farkas, J., Jármai, K. & Orbán, F. Cost Minimization of a Ring-Stiffened Conical Shell Loaded by External Pressure. Weld World 52, 110–115 (2008). https://doi.org/10.1007/BF03266645
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF03266645