Masonry Magazine April 1982 Page. 22
Limitations on corbelling:
P < t/2
P < h/2
P < d/3
Where:
P = allowable total horizontal projection of corbeling.
p = allowable projection of one unit,
t = nominal wall thickness (actual thickness plus the thickness of one mortar joint),
h = nominal unit height (actual height plus the thickness of one mortar joint).
d = nominal unit bed depth (actual bed depth plus the thickness of one mortar joint).
LIMITING SLOPE OF CORBELING (6):
TAN = h/p
p (MAX) = h/2 (see Fig. 3-12)
TAN (MIN)=2
> 63°26′
Limitations on Corbeling
FIG. 8
CONCENTRATION OF STRESS FROM COMPRESSION
45°
PROJ.
BENDING & SHEAR STRESSES
AXIAL & SHEAR STRESSES
30°
PROJ.
Corbeling Stress Distribution
FIG. 9
5