Flexural Utilisation — LRFD
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Applied Loads (UDL)
Span L (ft)
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Max moment M* (LRFD)
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Max shear V* (LRFD)
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Section Classification (AISC 360-22 Table B4.1a)
Flange λ = bf/2tf
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Flange class
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Web λ = (d−2tf)/tw
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Overall section class
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Lateral-Torsional Buckling (AISC 360-22 §F2)
Cb
—
Lp
—
Lr
—
Lb
—
LTB mode
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Mn (LTB) GOVERNING
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φMn (LRFD)
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Mn/Ω (ASD)
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Flange Local Buckling (AISC 360-22 §F4) GOVERNING
Flange λ
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Mn (FLB)
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φMn (LRFD)
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Tension Flange Yielding (AISC 360-22 §F5) GOVERNING
Mn (TFY)
—
φMn (LRFD)
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Governing Flexural Capacity + Utilisation
Governing failure mode
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Mn,governing
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φMn (LRFD) / Mn/Ω (ASD)
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Util. η = M*/φMn
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Shear Strength (AISC 360-22 §G2)
Web area Aw (in²)
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φVn (LRFD)
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Vn/Ω (ASD)
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V*/φVn
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Deflection (AISC 360-22 App. C)
Live δ
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Live limit (L/360)
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Live check
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Total δ
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Total limit (L/240)
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Total check
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W section beam — UDL on simply supported span (schematic)
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