1. (1) EN 1999‑1‑5 applies to the structural design of aluminium structures, stiffened and unstiffened, that have the form of a shell of revolution or of a round panel in monocoque structures.
2. (2) EN 1999‑1‑5 covers additional provisions to those given in the relevant parts of EN 1999 for design of aluminium structures.

   NOTE Supplementary information for certain types of shells is given in EN 1993‑1‑6 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. (4) The provisions in EN 1999‑1‑5 apply to axisymmetric shells (cylinders, cones, spheres) and associated circular or annular plates, beam section rings and stringer stiffeners, where they form part of the complete structure.
4. (5) Single shell panels (cylindrical, conical or spherical) are not explicitly covered by EN 1999‑1‑5. However, the provisions can be applicable if the appropriate boundary conditions are duly taken into account.
5. (6) Types of shell walls covered in EN 1999‑1‑5 can be (see Figure 1.1):
   • — shell wall constructed from flat rolled sheet with adjacent plates connected with butt welds, termed “isotropic”;
   • — shell wall with lap joints formed by connecting adjacent plates with overlapping sections, termed “lap-jointed”;
   • — shell wall with stiffeners attached to the outside, termed “externally stiffened” irrespective of the spacing of stiffeners;
   • — shell wall with the corrugations running up the meridian, termed “axially corrugated”;
   • — shell wall constructed from corrugated sheets with the corrugations running around the shell circumference, termed “circumferentially corrugated”.
   Figure 1.1 — Illustration of cylindrical shell form

   

   1	Isotropic (unstiffened)
   2	Lap-joined
   3	Externally stiffened
   4	Axially corrugated
   5	Circumferentially corrugated

6. (7) The provisions of EN 1999‑1‑5 are intended to be applied within the temperature range defined in EN 1999‑1‑1. The maximum temperature is restricted so that the influence of creep can be neglected. For structures subject to elevated temperatures associated with fire, see EN 1999‑1‑2.
7. (8) EN 1999‑1‑5 does not cover the aspect of leakage.

The second generation of EN Eurocode standards is expected to be published between 2023 and 2026. These documents are being published as soon as they are available, to enable users to prepare for the transition from the first generation to second generation of Eurocodes. As set out in the National foreword of the BS EN second generation Eurocodes, UK adoptions of the first generation of Eurocodes will be withdrawn by BSI on 30 March 2028. That means there is a period of coexistence between 2023 and 2028 during which both first and second generation Eurocodes are available.

Until 30 March 2028, the first generation documents should be considered as the applicable standards for buildings and civil engineering works constructed in the UK unless otherwise specified by the relevant authority or in the specification for a particular project. While the use of provisions in second generation Eurocodes in conjunction with first generation Eurocodes is not precluded, it should be undertaken with care and should only be done when users are satisfied that it will not result in a lower level of reliability than the minimum level set in the first generation Eurocodes and associated UK National Annexes.