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Commentary of Highly Ductile Members

How does ideCAD control the maximum spacing of highly ductile beams according to AISC 341-16?

  • Maximum spacing of beam bracing systems is controlled automatically and reported with steel beam reports.


Fy = Specified minimum yield stress
Ry = Ratio of the expected yield stress to the specified minimum yield stress, Fy
Lb = Length between points which are either braced against lateral displacement of compression flange or braced against twist of the cross-section, in. (mm)
ry = Radius of gyration about y-axis, in. (mm)
E= Modulus of elasticity of steel = 29,000 ksi (200 000 MPa)

Spacing of stability braces for highly ductile members is specified not to exceed 0.095ryE/(RyFy). This control is done automatically and reported on the beam elements of the frame.

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