Steel column 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;

CE001 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 must be less than 1.

Possible Solutions:

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

• The PMM ratio can be reduced if braces are entered to reduce the lateral retention length on the weak axis of the columns, as an example is shown in the picture below.
  
  

  Open

  

• Steel element cross-section can be enlarged.