scope:

1.1 Scope (1) EN 1993-1-6 gives basic design rules for plated steel structures that have the form of a shell of revolution. (2) This Standard is intended for use in conjunction with EN 1993-1-1, EN 1993-1-3, EN 1993-1-4, EN 1993-1-9 and the relevant application parts of EN 1993, which include: Part 3.1 for towers and masts; Part 3.2 for chimneys; Part 4.1 for silos; Part 4.2 for tanks; Part 4.3 for pipelines. (3) This Standard defines the characteristic and design values of the resistance of the structure. (4) This Standard is concerned with the requirements for design against the ultimate limit states of: plastic limit; cyclic plasticity; buckling; fatigue. (5) Overall equilibrium of the structure (sliding, uplifting, overturning) is not included in this Standard, but is treated in EN 1993-1-1. Special considerations for specific applications are included in the relevant application parts of EN 1993. (6) The provisions in this Standard apply to axisymmetric shells and associated circular or annular plates and to beam section rings and stringer stiffeners where they form part of the complete structure. General procedures for computer calculations of all shell forms are covered. Detailed expressions for the hand calculation of unstiffened cylinders and cones are given in the Annexes. (7) Cylindrical and conical panels are not explicitly covered by this Standard. However, the provisions can be applicable if the appropriate boundary conditions are duly taken into account. (8) This Standard is intended for application to steel shell structures. Where no standard exists for shell structures made of other metals, the provisions of this standards may be applied provided that the appropriate material properties are duly taken into account. (9) The provisions of this Standard are intended to be applied within the temperature range defined in the relevant EN 1993 application parts. The maximum temperature is restricted so that the influence of creep can be neglected if high temperature creep effects are not covered by the relevant application part. (10) The provisions in this Standard apply to structures that satisfy the brittle fracture provisions given in EN 1993-1-10. (11) The provisions of this Standard apply to structural design under actions that can be treated as quasi-static in nature. (12) In this Standard, it is assumed that both wind loading and bulk solids flow can, in general, be treated as quasi-static actions. (13) Dynamic effects should be taken into account according to the relevant application part of EN 1993, including the consequences for fatigue. However, the stress resultants arising from dynamic behaviour are treated in this part as quasi-static. (14) The provisions in this Standard apply to structures that are constructed in accordance with EN 1090-2. (15) This Standard does not cover the aspects of leakage. (16) This Standard is intended for application to structures within the following limits: design metal temperatures within the range -50°C to +300°C; radius to thickness ratios within the range 20 to 5000. NOTE: It should be noted that the stress design rules of this standard may be rather conservative if applied to some geometries and loading conditions for relatively thick-walled shells.