Design Design approaches approaches according to Eurocode 7 according to Eurocode 7 October 2010 October 2010 Structural Engineering Master program - Structural Engineering Master program - Irina Lungu Irina Lungu Faculty of Civil Engineering and Faculty of Civil Engineering and Building Services Iasi Building Services Iasi
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Design approaches Design approaches according to Eurocode 7according to Eurocode 7
October 2010October 2010Structural Engineering Master program - Irina Structural Engineering Master program - Irina
LunguLungu
Faculty of Civil Engineering and Building Faculty of Civil Engineering and Building Services IasiServices Iasi
Geotechnical restrictionGeotechnical restriction
Ed <= Rd Ed = γE * Ek Md = Mk / γM Rd = Rk / γR
Parameters with their real values, without safety factors, are named characteristic values with an index k: Ek = characteristic actions, Rk = characteristic resistances.
Parameters with safety factors are named design values with an index d: Ed = design actions, Rd = design resistances.
For the GEO and STR limit states, the three possible design approaches use different sets of partial safety factors:
Design approach 1 with two combinations: Combination 1: A1 + M1 (= 1) + R1 (= 1) → safety factors on
materials (soil) for piles: Combination 1: A1 + M1 (= 1) + R1 (= 1) Combination 2: A2 (= 1) + (M1 (= 1) or M2) + R4 (M1 for pile resistance, M2 for unfavorable actions like negative skin
friction or transversal loads)
Design approach 2: A1 + M1 (= 1) + R2 → safety factors on loads and resistances
Design approach 3: A2 (= 1) + M2 + R3 (= 1) (A1 for loads from the structure without influence of soil material
parameters)
Design exampleDesign example 1 – spread foundation 1 – spread foundationProposal within Evaluation of Eurocode 7Proposal within Evaluation of Eurocode 7