![Compact and Non-compact section According to AISC 1 Compact and Non compact section According to AISC](https://excel.civilmdc.com/wp-content/uploads/2021/12/Compact-and-Non-compact-section-According-to-AISC.png)
A compact section means that the section can achieve the plastic moment with local buckling on the web or the flange. But a noncompact section is a section that can reach the yields for the lower and bottom fiber only without causing local buckling to the web or the flange.