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Beams: the minimum area of longitudinal reinforcement following the EN Eurocode recommendation, As,min

Eurocode 2 part 1-1: Design of concrete structures  9.2.1.1 (1)

The recommended value for the minimum reinforcement areas is:

As,min = 0,26 (fctm / fyk) bt d   ≥ 0,0013 bt d (9.1N)

where:

fctm
is the mean value of axial tensile strength of concrete at 28 days, see Table 3.1
fyk
is the characteristic yield stress of reinforcement steel
bt
is the mean width of the tension zone; for a T-beam with the flange in compression, only the width of the web is taken into account in calculating the value of bt
d
is the effective depth of concrete cross-section.

This application calculates the minimum area of reinforcement As,min from your inputs.

Input
MPa
MPa
cm
cm
Output
0,0013 bt d
cm2
the minimum area of reinforcement As,min
cm2 (9.1N)