Chapter 12: Annex A (Informative). Stiffness of joint components in buildings
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Published:2025
Roger P Johnson, Stephen J Hicks, 2025. "Annex A (Informative). Stiffness of joint components in buildings", Designers' Guide to EN 1994-1-1: 2026 Eurocode 4: Design of composite steel and concrete structures: Part 1.1: General rules and rules for buildings, Roger P Johnson, Stephen J Hicks
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This chapter corresponds to Annex A in EN 1994-1-1, which has the following clauses.
Annex A is needed for the application of clause 11. It is ‘Informative’ because the ‘component’ approach to the design of steel and composite joints continues to be developed. The UK’s National Annex is expected to permit it to be used. Its content is based on the best available research. It is informed by and generally consistent with two reports prepared on behalf of the steel industry (Couchman and Way, 1998; ECCSTC11, 1999).
This Annex supplements the provisions on stiffness of steel joints in clause 8 and Annexes A and B of EN 1993-1-8 (BSI, 2024). It covers conventional beam-to-column joints in regions where the longitudinal slab reinforcement is in tension, and the use of steel contact plates or end plates in compression. As in EN 1993-1-8, stiffness coefficients ki are determined (clause A.2(2)), with dimensions of length, such that when multiplied by Young’s elastic modulus for steel, the result is a conventional linear stiffness (force per unit extension or compression).
