![]() ![]() It is applicable for beams even if design shear reinforcement is not required. The minimum shear reinforcement ratio ρ w,min is defined in EN §9.2.2(5).According to EN §9.2.1.1(1) Note 2 for the case of beams where a risk of brittle failure can be accepted, the minimum longitudinal tension reinforcement may be taken as 1.2 times the area required in ULS verification.For the secondary reinforcement of one-way slabs the minimum reinforcement is 20% of the primary reinforcement in accordance with EN §9.3.1.1(2). #CT FLEXTURE CRACK#Typically a larger quantity of minimum longitudinal reinforcement for crack control is required in accordance with EN §7.3.2. This minimum reinforcement is required in order to avoid brittle failure. The minimum longitudinal tension reinforcement ratio ρ min is applicable for tension edges of beams, two-way slabs and principal direction of one-way slabs.The minimum longitudinal tension reinforcement ratio ρ min corresponds to the notional area b t d where b t is the mean width of the tension zone and d is the effective depth of the cross-section.Please consult the National Annex about the appropriate value of α cc for each specific design case. The values of concrete design compressive strength f cd are given as a function of the reduction coefficient α cc as defined in EN §3.1.6(1)P.According to EN §3.1.3(2) the following modifications are applicable for the value of the concrete modulus of elasticity E cm: a) for limestone aggregates the value should be reduced by 10%, b) for sandstone aggregates the value should be reduced by 30%, c) for basalt aggregates the value should be increased by 20%.Minimum longitudinal tension reinforcement ratio Concrete Design Properties according to EN ( γ c = 1.50, f yk = 500 MPa) SymbolĬharacteristic cylinder compressive strength ![]()
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