Stress Reduction Factors Cmy and Cmz - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

Specifies the interaction formula coefficients (Cmy and Cmz) for the strong and weak axis of the elements (in-plane and out-of-plane). Values include the following:

  • 0.85 for compression members in frames subject to joint translation (side sway).

  • For restrained compression members in frames braced against side sway and not subject to transverse loading between supports in the plane of bending:

    0.6 - 0.4(M1/M2)

    but not less than 0.4, where (M1/M2) is the ratio of the smaller to larger moments at the ends, of that portion of the member un-braced in the plane of bending under consideration.

  • For compression members in frames braced against joint translation in the plane of loading and subject to transverse loading between supports, the value of Cmy can be determined by rational analysis. Alternatively, the following values are suggested per the AISC code:

    • 0.85 for members whose ends are restrained against rotation in the plane of bending.

    • 1.0 for members whose ends are unrestrained against rotation in the plane of bending.