EUROCODE 2 WORKED EXAMPLES - Federbeton

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EC2 – worked examples 6-28 EXAMPLE 6.12 Pile cap [EC2 clause 6.5] Geometry: 4500 x 4500 mm plinth (thickness b=1500 mm), 2000 x 700 mm columns, diameter 800 mm piles Fig. 6.17 Log plinth on pilings. Materials: concrete C25/30 fck = 25 MPa, steel B450C fyk = 450 MPa 0.85f ck 0.85⋅ 25 2 fcd = = = 14.17 N / mm , 1.5 1.5 f 450 fyd = = = 391.3 N / mm 1.15 1.15 Table of Content yk 2 Nodes compression resistance (same values as in the example 6.8) Compressed nodes σ1Rd,max = 15 N/mm 2 tied-compressed nodes with tension rods in one direction σ2Rd,max = 12.75 N/mm 2 tied-compressed nodes with tension rods in different directions σ3Rd,max = 11.22 N/mm 2 Pedestal pile NSd = 2000 kN MSd = 4000 kNm
EC2 – worked examples 6-29 Tied reinforcement in the pile: 8 φ 26 (A s = 4248 mm 2 ) The compressive stress F c in the concrete and the steel tension F s on the pedestal pile are evaluated from the ULS verification for normal stresses of the section itself: Fs = fyd As = 391.3·4248 = 1662242 N = 1662 kN N Sd = 0.8 b x f cd – F s ⇒ 2000000 = 0.8·700·x·14.17 − 1662242 ⇒ x = 462 mm The compressive stress in the concrete is: C = 0.8 b x fcd = 0.8·700·462·14.17 = 3666062 N = 3666 kN (applied at 0,4⋅x ≅ 185 mm from the upper surface) piles stress pile stresses are evaluated considering the column actions transfer in two steps: in the first step, the transfer of the forces Fc e Fs happens in the plane π1 (Fig. 6.17) till to the orthogonal planes π2 and π3, then in the second step the transfer is inside the planes π2 and π3 till to the piles; the truss-tie beam in Fig. 6.18 is relative to the transfer in the plane π1: compression: A’ = (MSd/3.00 + NSd/2) = (4000/3.00 + 2000/2) = 2333 kN tension: B’ = (MSd/3.00 - NSd/2) = (4000/3.00 - 2000/2) = 333 kN for each compressed pile: A=A’/2 = 1167 kN for each tied pile: B=B’/2 = 167 kN In the evaluation of stresses on piles, the plinth own weight is considered negligible. Table of Content Fig. 6.18. S&T model in the plane π1.
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EUROCODE 2 WORKED EXAMPLES
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Copyright: European Concrete Platfo
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EC2 - worked examples 7-12 * * ⎡1
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EC2 - worked examples 7-14 σ s (2/
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EC2 - worked examples 7-16 0.1687
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EC2 - worked examples 7-18 EXAMPLE
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EC2 - worked examples 7-20 1⎡ λ
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EUROCODE 2 WORKED EXAMPLES - Federbeton

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