Reinforced concrete slabs, at least those designed to span in one direction, are no different conceptually from any other beams, with the following three caveats.First, only 3/4-in. 7.4.2(2) increases the allowable, Effects related to concrete tension zone stiffening are: (i) it increases stiffness when concrete stresses are low (low, As can be seen from Tables 6 & 7, although BS 8110 and EC 2 give very similar results when, (ii) increasing concrete strength does not affect allowable. (Asprov/bd) x (Ïs/310)? EC 2 Cl. Alasdair N Beal BSc CEng MICE FlStructE, Thomasons LLP, Leeds. endobj x 27 in., interior beam dimensions = 14 in. Flat plate concrete floor system does not use beams between columns or drop panels and it is usually suited for lightly loaded floors with short spans typically for residential and hotel endobj endobj Traditionally column spacings and floor spans in these buildings have been in the range of 6 to 9 metres, to both contain costs and simplify construction. Beal, A. N.: âSpan/depth ratios for concrete beams and slabsâ, The. 20 0 obj Manual for the design of reinforced concrete building structures. Floor Planks Data Sheet. 7.4.2 does also offer an alternative method, where allowable L/d limits are calculated using equations 7.16 and 7.17. BS EN 1992-1-1:2004 Eurocode 2: Design of concrete structures - Part 1-1: General rules and rules for buildings, British Standards Institution, London, 2004, revised 2008, 2. Then in 2002 an amendment reduced the material factor to 1.05 and fs was increased to 0.667fy = 307N/mm². (Reinforcement bars assumed H12 with 20mm cover in all cases.). The slab depths in the tables are m e a s u red from the top of the slab to the bottom of the ribs in the deck-ing. However Eurocode 0 Clauses 1.5.3.17, 1.5.3.18, 4.1.3 and 6.5.3 define two other loading conditions: a âfrequentâ loading and a âquasi-permanentâ loading. However the engineer who wishes to produce an economical design has no alternative but to try to get to grips with equations 7.16a, 7.16b and 7.17. As deflection is a serviceability condition, analysis has been based on service loads and these are generally taken as the design characteristic loads. It also shares the weakness of the old CP 110 rules: for initial sizing of slabs and beams the engineer has to rely on conservative guesswork, as the allowable span/depth ratio cannot be checked until the reinforcement design is complete. Concrete floor systems are reinforced slab structures designed to satisfy a range of loading and span conditions in a building. 87 No. 7.4.1, deflection calculations should be based on the âquasi-permanentâ loading. 7 0 obj This paper considers the span/depth rules proposed by Eurocode 2 [1] and compares them with existing UK practice. Load on the slab … endobj 32 0 obj It also proposes to remove the unworkable limitation on the application of Eq. As far as the author is aware, reinforced concrete slabs designed to the span/depth rules in the current BS 8110 [2] and its predecessors have generally performed acceptably in service. 16 0 obj However, whereas in Interpretation âAâ the effect was much less than in BS 8110, in Interpretation B it is greater than in BS 8110: reducing fs from 310N/mm² to 150N/mm² increases the allowable L/d by 26% in BS 8110 but in EC 2 it increases by 29%. Table 4 shows the results from EC 2 if it is interpreted in this way for a simply supported slab with a total load of 10kN/m² and these are compared with BS 8110. As can be seen, in BS 8110 the allowable L/d increases steadily with reducing tensile stress: reducing fs from 310N/mm² to 200N/mm² increases the allowable L/d by 20%.
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