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Maximum Moment of a Rectangular or Round Bar:

Calculation:

Designer/Checker:

Input:

Metric Units

(Note: All input Metric units are converted to English units for the equations below and then the output English units are converted back to Metric)

From AISC F11:

This calculation applies to rectangular bars bent about either geometric axis and rounds.

ASD

LRFD

Rectangular bar bent about major axis

Round bar or rectangular bar bent about minor axis.

Unbraced length (Lb - ft or m)

Lateral-torsional buckling modification factor (Cb)*

Steel yield strength (fy - ksi or MPa)

Depth of the bar (d - in or mm)

Plastic section modulus (Z - in^3 or mm^3)

Elastic section modulus (S - in^3 or mm^3)

Width of bar parallel to axis of bending (t - in or mm)

*Can conservatively assume Cb = 1.0.

Output:

Maximum moment of the beam, Mu =