Applies To
	Product(s):	STAAD.Pro
	Version(s):	All
	Environment:	N/A
	Area:	Steel Design
	Subarea:	API 2A-WSD 21st Edition
	Original Author:	Bentley Technical Support Group

How is the plastic moment determined in calculation of the Chord Load Factor?

The plastic moment, Mp is calculated as the yield strength*plastic section modulus. The plastic section modulus is taken as 1.3 times the elastic section modulus.