CEN/TC 250/SC 9/WG 1 - Update and Simplification of all parts of EN 1999

1.1   Scope of EN 1999-1-4
(1)   EN 1999-1-4 gives design requirements for cold-formed trapezoidal aluminium sheeting. It applies to cold-formed aluminium products made from hot rolled or cold rolled sheet or strip that have been cold-formed by such processes as cold-rolled forming or press-breaking.
NOTE 1   The rules in this part complement the rules in other parts of EN 1999-1.
NOTE 2   The execution of aluminium structures made of cold-formed structures for roof, ceiling, floor and wall applications is covered in EN 1090-5.
(2)   EN 1999-1-4 gives methods for stressed-skin design using aluminium sheeting as a structural diaphragm.
(3)   EN 1999-1-4 does not apply to cold-formed aluminium profiles like C- and Z- profiles nor cold-formed and welded circular or rectangular hollow sections.
(4)   EN 1999-1-4 gives methods for design by calculation and for design assisted by testing. The methods for the design by calculation apply only within stated ranges of material properties and geometrical properties for which sufficient experience and test evidence is available. These limitations do not apply to design by testing.
(5)   EN 1999-1-4 does not cover load arrangement for loads during execution and maintenance.
1.2   Assumptions
(1) For the design of new structures, EN 1999 is intended to be used, for direct application, together with EN 1990, EN 1991, EN 1992, EN 1993, EN 1994, EN 1995, EN 1997 and EN 1998.
EN 1999 is intended to be used in conjunction with:
-   European Standards for construction products relevant for aluminium structures;
-   EN 1090-1, Execution of steel structures and aluminium structures - Part 1: Requirements for conformity assessment of structural components;
-   EN 1090-5, Execution of steel structures and aluminium structures - Part 5: Technical requirements for cold-formed structural aluminium elements and cold-formed structures for roof, ceiling, floor and wall applications.

1.1   Scope of EN 1999-1-5
(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)   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.
(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.
(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.
(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]
(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.
(8)   EN 1999-1-5 does not cover the aspect of leakage.
1.2   Assumptions
(1)   The general assumptions of EN 1990 apply.
(2)   The provisions of EN 1999-1-1 apply.
(3)   The design procedures are valid only when the requirements for execution in EN 1090-3 or other equivalent requirements are complied with.
(4)   For the design of new structures, EN 1999 is intended to be used, for direct application, together with EN 1990, EN 1991, EN 1992, EN 1993, EN 1994, EN 1995, EN 1997 and EN 1998.
(5)   EN 1999 is intended to be used in conjunction with:
-   European Standards for construction products relevant for aluminium structures;
-   EN 1090-1, Execution of steel structures and aluminium structures - Part 1: Requirements for conformity assessment of structural components;
-   EN 1090-3, Execution of steel structures and aluminium structures - Part 3: Technical requirements for aluminium structures.

1.1 Scope of EN 1999-1-3
(1) This document gives the basis for the design of aluminium alloy structures subject to fatigue in the ultimate limit state.
(2) This document gives rules for:
- safe life design;
- damage tolerant design;
- design assisted by testing.
(3) This document does not cover pressurized containment vessels or pipework.
1.2 Assumptions
(1) The general assumptions of EN 1990 apply.
(2) The provisions of EN 1999-1-1 apply.
(3) EN 1999-1-3 is intended to be used in conjunction with EN 1990, EN 1991 (all parts), relevant parts in EN 1992 to EN 1999, EN 1090-1 and EN 1090-3 for requirements for execution, and ENs, EADs and ETAs for construction products relevant to aluminium structures.