EN 1992-1-1:2004 (E) 34 (2) Other idealised stress-strain relations may be applied, if they adequately represent the behaviour of the concrete considered. Figure 3.2: Schematic representation of the stress-strain relation for structural analysis (the use 0,4fcm for the definition of Ecm is approximate). 3.1.6 Design compressive and tensile strengths (1)P The value of the design compressive strength is defined as fcd = αcc fck / γ C (3.15) where: γ C is the partial safety factor for concrete, see 2.4.2.4, and αcc is the coefficient taking account of long term effects on the compressive strength and of unfavourable effects resulting from the way the load is applied. Note: The value of αcc for use in a Country should lie between 0,8 and 1,0 and may be found in its National Annex. The recommended value is 1.
(2)P The value of the design tensile strength, fctd, is defined as fctd = αct fctk,0,05 / γ C (3.16) where: γ C is the partial safety factor for concrete, see 2.4.2.4, and αct is a coefficient taking account of long term effects on the tensile strength and of unfavourable effects, resulting from the way the load is applied. Note: The value of αct for use in a Country may be found in its National Annex. The recommended value is 1,0.
3.1.7 Stress-strain relations for the design of cross-sections (1) For the design of cross-sections, the following stress-strain relationship may be used, see Figure 3.3 (compressive strain shown positive): fcm 0,4 fcm
ε c1 σc ε cu1 εc
tan α = Ecm
α
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