# 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.

### Solution:

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

Steel element cross-section can be enlarged.

**Symbols**

**P _{r}: ** Required axial strength using LRFD or ASD load combinations

**P**Available axial strength

_{c}:**M**Required flexural strength using LRFD or ASD load combinations

_{r}:**M**Available flexural strength

_{c}:**x**: subscript relating symbol to significant axis bending

**y**: subscript relating symbol to minor axis bending

**Sonraki Konu**