 Printer EmailThe introduction of European standards to UK construction is a significant event. The ten design standards, known as the Eurocodes, will affect all design and construction activities as current British Standards for design are due to be withdrawn in 2010. This publication is part of the series of guides entitled How to design concrete structures using Eurocode 2. Their aim is to make the transition to Eurocode 2: Design of concrete structures as easy as possible by drawing together in one place key information and commentary required for the design of typical concrete elements. The cement and concrete industry recognised that a substantial effort was required to ensure that the UK design profession would be able to use Eurocode 2 quickly, effectively, efficiently and with confidence. With support from government, consultants and relevant industry bodies, the Concrete Industry Eurocode 2 Group (CIEG) was formed in 1999 and this Group has provided the guidance for a co-ordinated and collaborative approach to the introduction of Eurocode 2. As a result, a range of resources is to be made available through The Concrete Centre to help designers during the transition period (see back cover for details). The analysis and design of concrete slabs with Eurocode 21 is essentially the same as with BS 81102, however, the layout and content of Eurocode 2 will appear unusual to designers familiar with BS 8110. British designers will find it strange that Eurocode 2 does not contain the derived formulae or specific guidance on determining moments and shear forces. This has arisen because it has been European practice to give principles in the codes and for the detailed application to be presented in other sources such as text books. The first guide in this series How to design concrete structures using Eurocode 2: Introduction3 highlighted the key differences between Eurocode 2 and BS 8110, including terminology. A separate guide in this series will cover the design of flat slabs. A procedure for carrying out the detailed design of slabs is shown in Table 1. This assumes that the slab thickness has previously been determined during conceptual design. More detailed advice on determining design life, loading, material properties, methods of analysis, minimum concrete cover for durability and control of crack widths can be found in the accompanying guide How to design concrete structures using Eurocode 2: Getting started4 It should also be noted that values from the UK National Annex have been used throughout this guide; this includes values that are embedded in derived formulae (full derivations can be found at www.eurocode2.info). A list of symbols is given at the end of this document.
Minimum cover for fire resistance for slabs: Eurocode 2 Part 1– 2: Structural fire design5, gives several methods for determining the fire resistance of concrete
The design procedure for flexural design is given in Figure 1; this includes derived formulae based on the simplified rectangular stress block from Eurocode 2. Table 3 may be used to determine bending moments and shear forces for slabs. Further information for the design of two-way, ribbed or waffle slabs is given in the appropriate sections below.
Author: R M Moss BSc PhD DIC CEng MICE MIStructE, O Brooker BEng CEng MICE Source: Eurocode 2, 2005 Paper: http://www.eurocode2.info/PDF/How_Slabs_June05.pdf
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