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Laterally supported beam in bending

Design bending strength of a plastic or compact section with full lateral restraint, with the 1.2 Ze limit. Reference: IS 800:2007 Cl. 8.2.1.2.

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# Material
f_y := 250 MPa
gamma_m0 := 1.10
beta_b := 1.0

# Section (example values for a 300 mm deep I-section)
Z_p := 651e3 mm^3
Z_e := 573e3 mm^3

# Strength
M_d := min(beta_b*Z_p*f_y/gamma_m0, 1.2*Z_e*f_y/gamma_m0) = kN*m
M_u := 120 kN*m
M_u <= M_d =

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