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Lap length of bars

Design lap length with the factor for the proportion of lapped bars and the minimum lap length. Reference: EN 1992-1-1 8.7.3.

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Lap length of bars: worked example sheet in Equation Pad with typeset equations and results.

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# Inputs
phi := 16 mm
f_ck := 30 MPa
f_yk := 500 MPa
gamma_c := 1.5
gamma_s := 1.15
alpha_6 := 1.5
# alpha_6 = 1.5 when more than 50% of the bars are lapped at one section.

# Lap
f_bd := 2.25*0.7*0.30*(f_ck/(1 MPa))^(2/3)*1 MPa/gamma_c =
l_brqd := phi/4*(f_yk/gamma_s)/f_bd = mm
l_0min := max(0.3*alpha_6*l_brqd, 15*phi, 200 mm) = mm
l_0 := max(alpha_6*l_brqd, l_0min) = mm

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