Applies To
	Product(s):	STAAD.Pro
	Version(s):	ALL
	Environment:	ALL
	Area:	Postprocessing workflow
	Subarea:
	Original Author:	Bentley Technical Support Group

In the plate element stress results, what do the terms TRESCAT and TRESTAB stand for? How are they calculated?

TRESCA is 2.0 times TMAX. TMAX is the maximum inplane shear stress on a plate element. TMAX = 0.5 * max[abs((s1 - s2)) , abs((s2 - s3)) , abs((s3 - s1))] where s1 and s2 are the inplane principal stresses and the 3rd principal stress, s3, is zero at the surface. TRESCAT is the value for the top surface of the element. TRESCAB is on the bottom. Top and bottom are in accordance with the direction of the local Z axis.

Example problem 18 in the examples manual shows the calculation of TMAX.