However, this applies only to beams with a rectangular cross-section, and are fairly conservative. They can have a square or rectangular cross-section, where the thickness refers to the same dimension as the height or depth.īeams are similar to slabs in terms of minimum thicknesses, in that Eurocode 2 uses a length to depth ratio to determine the depth of the beam as per the following table. Beams are typically the horizontal concrete members. Slab supported on columns without beams (flat slab)īeams are defined as having a span not less than 3 times the overall section depth, though if this is the case they may be considered as a deep beam. Simply supported slab, one- or two-way spanning Ground-bearing concrete floor slabs (residential construction) With that being said, and to avoid too much ambiguity, we’d advise a minimum of 125mm for all situations. These examples, however, are meant as ‘real world’ applications with suggestions as to what you could potentially use without expecting any problems. Some of these situations, such as footpaths and patios, don’t contain structural members and are generally not designed by engineers, hence they are not subject to the Eurocode 2 regulations. See Table 7.4N in Eurocode 2 for more information. It’s important to remember that these may not be appropriate for your loading conditions, however. While there many variables in the minimum thickness of slabs, there are some standard thicknesses used for typical situations.
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