Applies To
	Product(s):	STAAD Foundation Advanced
	Version(s):	ALL
	Environment:	ALL
	Area:	General Foundation
	Subarea:	Combined Footing
	Original Author:	Sye Chakraborty Bentley Technical Support Group

I am trying to design a combined footing with 4 supports (all supports). I received an error saying "ALL SELECTED SUPPORTS ARE NOT COLLINEAR AND PARALLEL TO GLOBAL AXIS. CANNOT CREATE COMBINED FOOTING. I checked my supports and all of them are at y=0.

For a combined footing to be created in STAAD Foundation Advanced, the supports need to follow two conditions

1. The supports need to lie along a straight line
2. The straight line along which the supports lie should be parallel to either Global X or Global Z.

So even if you may have all supports at the same Y elevation, your supports may not satisfy one or more of these criteria, in which case such a message will be provided. For such cases you may use the mat foundation job instead and model the combined footing as a mat.