Applies To
	Product(s):	STAAD.Pro
	Version(s):	ALL
	Environment:	ALL
	Area:	Modeling Solutions
	Subarea:	Properties
	Original Author:	Sye Chakraborty, Bentley Technical Support Group

How to account for cracked section properties when modeling with concrete in STAAD.Pro?

There are two ways. One can directly enter the reduced values for the sections using the PRISMATIC option as shown next

…

UNIT IN KIP

MEMB PROP

11 TO 21 PR YD 21.0 ZD 16.0 IZ 4321 IY 2509

…

The YD and ZD represent the overall dimensions which are used by the software to calculate the properties that are not input directly by the user. The IZ and IY represent the cracked section properties. Using the GUI, one can do the same from within the Properties > Define dialog and define the properties using the General option as shown next

Alternately one can define the cracked section property by going to the Specification page. From within the Specification - Whole Structure dialog box on the right, click on Beam button and there is the Property Reduction Factors tab in there. Using that one can assign reduction factors to properties like cross sectional area and moment of inertia as shown next