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Effective width of T and L beam flanges

Effective flange width of T-beams and L-beams cast with the slab. Reference: IS 456:2000 Cl. 23.1.2.

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Effective width of T and L beam flanges: worked example sheet in Equation Pad with typeset equations and results.

Example only. This sheet shows one way to set out the check. It is not endorsed by the bodies that publish the design codes and does not reproduce them. Check every clause, value and assumption against your own copy of the current edition of IS 456 before you use it, and have the result checked by a competent person. See the disclaimer.

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# Data
l_0 := 6 m
b_w := 300 mm
D_f := 125 mm
l_c := 3 m
# l_0 is the distance between points of zero moment; l_c the clear distance to the next beam.

# T-beam
b_f.T := min(l_0/6 + b_w + 6*D_f, b_w + l_c) = mm

# L-beam
b_f.L := min(l_0/12 + b_w + 3*D_f, b_w + l_c/2) = mm

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