Elastic Stresses in Unshored Composite Section. The elastic stresses at any location shall be the sum of stresses caused by appropriate loads applied separately Steel beam Permanent loads applied before the slab has hardened, are carried by the steel section. Short-term composite section
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The procedure shown in this picture is only valid if the neutral axis is not in the concrete.
Use iterations otherwise.
Effective Width (Interior)
Proportioning the section (6.10.2)
Non-Compact sections (188.8.131.52)
Fn or Mn
Fmax or Mmax
Fyr or Mr
Web plastification in shear
Inelastic web buckling
Elastic web buckling
Vu≤ fv Vn
Vn = Vcr = C Vp
where, Vp = 0.58 Fyw D tw
k = 5 for unstiffened webs
Tension Field Action
Vn = C (0.58 Fyw D tw)
Less than 4 twor more than 6tw
bt≥ 2.0 + d/30
and bf/4 ≤ bt ≤ 16 tp
It ≥ do tw3 J
where, J = required ratio of the rigidity of one transverse stiffener to that of the web plate = 2.5 (D/do)2 – 2.0 ≥ 2.5
It = stiffener m.o.i. about edge in contact with web for
single stiffeners and about mid thickness for pairs.
Cross-sectional are of the stud in square inches
Minimum tensile strength of the stud (usually 60 ksi)