DANSK DSF/PREN 1993-1-13 PDF

1.1 Scope of prEN 1993-1-13 1.1.1 General (1) This document gives supplementary provisions that extend the application of EN 1993-1-1 and EN 1993 1 5 to the design of rolled and welded steel sections with various shapes of web openings. The following cases are considered: – rolled or welded beams with widely spaced web openings; – rolled or welded beams with closely spaced web openings; – cellular beams with circular openings made by cutting and re-welding two parts of steel sections that may be different in dimensions; – beams with hexagonal and sinusoidal openings made by cutting and re-welding two parts of steel sections that may be different in dimensions. (2) This document applies to uniform members with I or H profiles, which are symmetric about the weak axis. It does not apply to non-prismatic or curved beams although the same principles can apply. (3) This document applies to steel beams with web openings that are subjected to sagging (positive) and to beams that are also subjected to hogging (negative) bending moments. (4) This document covers the verification of the resistance at the openings and their effect on the global behaviour of the beam, including lateral torsional buckling. (5) Alternative methods are presented for beams with circular openings and with sinusoidal openings in which the forces and resistances are calculated by increments around or along the openings and which are suitable for computer methods. (6) This document applies to web slenderness, hw/tw, not exceeding 121ε. The local checks at and between adjacent openings apply to web slenderness up to this limit. Tension field action of plate girders is not part of the scope. NOTE – The limit of 121ε corresponds to the section classification for a symmetric steel section and is used as a convenient limit for the application of this document, including asymmetric sections. The material parameter ε is defined in prEN 1993-1-1:2020, 5.2.5 (2). (7) This document does not cover fatigue. In case of fatigue, EN 1993-1-9 applies. (8) This document does not cover fire design. For the design in case of fire, EN 1993-1-2 applies. (9) This document does not cover the buckling verification of members with web openings under axial force. 1.1.2 Shapes of openings (1) The different shapes of openings that are considered in this document are shown in Figure 1.1. Figure 1.1... 1.1.3 Stiffened openings (1) This document also covers openings in the web of beams that are reinforced by longitudinal stiffeners and/or transverse stiffeners on one or both sides of the web, see Figure 1.2. NOTE – The National Annex can give rules for alternative types of stiffener. Figure 1.2... 1.2 Assumptions (1) Unless specifically stated, EN 1990, EN 1991 (all parts) and EN 1993-1-1 apply. (2) The design methods given in EN 1993-1-13 are applicable if – the execution quality is as specified in EN 1090-2, and – the construction materials and products used are as specified in the relevant parts of EN 1993 (all parts), or in the relevant material and product specifications.