Hello there; The PMM ratio is the ratio of the axial load, major and minor directional bending strengths to the loads on the element, and it can have different solutions for the cases where the element you use is moment-transmitting or sliding or only works with axial load. I need to see your project before I can comment. However, in general, the solution is to enlarge the section to increase the strength. Under axial load, under lateral torsional buckling due to weak direction effects, the strength of the control may decrease, for this it may be necessary to shorten the buckling length. For example, if this situation occurs in roof braces under axial load, you can increase the number of diagonals on the roof or enlarge the cross section in order to shorten the diagonal length. You can use a tension rod for the purlin. In order to interpret these situations in general, Prof. You can benefit from the book of explanations and examples about the buildings to be built in earthquake zones, published together with the Steel Structures book of Erdoğan Uzgider, Hilmi Deren and the Earthquake Code. Good work.