Masonry Magazine April 1982 Page. 22

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