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General Description
Section 1
1-38
(12EI/L
3
)/(1+Φ) where
Φ = (12 EI) / (GA
s
L
2
) and A
s
is the shear stiffness effective area.
PHI (Φ)is usually ignored in basic beam theory. STAAD will
include the PHI term unless the SET SHEAR command is entered.
Shear stress effective area is a different quantity that is used to
calculate shear stress and in code checking. For a rectangular cross
section, the shear stress effective area is usually taken as 2/3 rds of
the cross sectional area.
Shear stress in STAAD may be from one of 3 methods.
1. (Shear Force)/(Shear stress effective area)
This is the case where STAAD computes the area based on
the cross section parameters.
2. (Shear Force)/(Shear stiffness effective area)
This is the case where STAAD uses the shear area entered.
3. (V Q)/(I t)
In some codes and for some cross sections, STAAD uses
this method.