PD 6550-3:1989

Foreword
Committees responsible
1. Introduction
2. Collapse types
2.1 What is the designer trying to prevent?
2.2 The method in BS 5500: a summary table
3. Design of cylinders against interstiffener collapse
3.1 Theory and experiment combined
3.2 The derivation of pm
3.3 The derivation of py
4. Overall collapse
4.1 The limit on stiffener total stress
4.2 The calculation of pn
5. Stiffener design
5.1 Sideways tripping
5.2 Limiting proportions
6. Cones
7. Snap-through buckling
7.1 Spheres and hemispherical ends
7.2 Torispherical and ellipsoidal ends
7.3 Cylinders under axial load
8. References
Table
1. Main features of the BS 5500 method
Figures
1. Buckling behaviour of ideal shells
2. Circumferential nodal shapes
3. Modes of collapse
4. Interstiffener collapse of a ring-stiffened
      cylinder under external pressure
5. Overall collapse of a ring-stiffened cylinder
      under external pressure
6. Snap-through buckling in torispherical heads
7. Elastic buckling stresses in imperfect spheres and
      cylinders subject to external pressure, and in
      imperfect axially-compressed cylinders
8. Curves for evaluation of allowable pressure p
9. Derivation of the design curve for cylinders and
      cones
10. Variation of individual modal buckling pressure
      with number of circumferential nodes
11. Displacement definition
12. Values of epsilon (with some of the n values for
      the minimum modal pressures
13. Positions where yield stress is reached at
      pressures py and pys
14. Bending strains in a stiffener
15. Sideways tripping (of an internal stiffener)
16. Results of collapse tests on torispherical domes
17. Test results for the buckling of thin cylindrical
      shells under axial compression

Describes the collapse modes which apply showing how each collapse mode is taken into account in Clause 3.6 of BS 5500. Both stiffened and unstiffened cylinders are examined.