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Steel beam PMM ratio not satisfied.

This message is created by specifying the element name and floor on which it is located at the beginning of the report.

For example,

SB001 BASE STORY PMM ratio not satisfied.

In steel element design, the design ratio under the combined axial force and biaxial bending (PMM ratio) is made by the CYTHYE 2016 (GKT & YDKT), AISC 360-16 (ASD & LRFD) or EN 1993-1-1. According to AISC 360-16, axial force and biaxial bending interaction equations are calculated below.

  • The PMM ratio value should be less than 1,00.


  • Laterally unbraced length of the steel element can be reduced by using steel braces.


  • Steel element cross-section can be enlarged.


Pr: Required axial strength using LRFD or ASD load combinations
Pc: Available axial strength
Mr: Required flexural strength using LRFD or ASD load combinations
Mc: Available flexural strength
x: subscript relating symbol to significant axis bending
y: subscript relating symbol to minor axis bending

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