# Fully-integrated Shell Element QBAT

QBAT is a fully-integrated shell element based on the general formulation described above. In the surface of each element, 4 Gauss points are used to evaluate the nodal forces.

The main modifications with respect to Q4
$\gamma $
24 shell element

^{2}are:- Reduced integration for in-plane shear (constant) to avoid locking.
- Co-rotational coordinate system is used and the stresses are evaluated in 4 local systems at each Gauss points.