Effective corner forces
A well-anchored plate subjected to lateral load will develop tension support forces affected by effective shear forces 
, 
at the corners. On the other hand, a plate without anchors will lift off the supports. The Kirchhoff theory of the plates accumulates all tension forces near the corner to one concentrated tension force at the corner.
Effective shear force accumulation
Effective shear force accumulation at the corner of the plate:
Division of the support reaction
- at a plate with the Poisson factor 0.2:
- at a plate with the Poisson factor 0:
