Masonry Magazine January 1976 Page.21
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FIG, 5
Schematic-E518
Method A Test Setup
where:
S section modulus of actual net bedded area, cu in. (cm³)
Method B test; specimen made of hollow masonry units.
R=
0.125(P + P)
S
For calculation of section modulus based on the net bedded areas of hollow units, the following formulae may be used:.
Fully bedded hollow units; (See Fig. 7).
FIG. 6
Schematic-E 518
Method B Test Setup
Reporting Test Data. After the testing is completed, the gross area modulus of rupture can be calculated using one of the following formulae.
Method A test; specimen made of solid masonry units.
R-
(P+0.75 P)
bd²
b,
b
b
b,
where:
R (f) gross area, modulus of rupture, psi (kgf/cm²)
P
- maximum machine applied load, lb (kgf)
P
- weight of specimen, lb (kgf)
FIG, 7
E 518 Specimen-Cross Section
Full Bedded Hollow Unit
Note: The crosshatched area represents the mortar bedded area of the specimen.
bd (b,d,+b2d₂ + b,d,......bd)
S=
span, in. (cm)
6d
b
-
average width of specimen, in. (cm)
d
average depth of specimen, in. (cm)
where:
b₁
Method B test; specimen made of solid masonry units.
bn
width of cores, in. (cm)
d₁
dn
depth of cores, in. (cm)
R=
0.75(P + P)
bd
Method A test; specimen made of hollow masonry units.
(0.167 P+0.125 P₂)
R=
S
Face shell bedded hollow units; (see Fig. 8).
S=
b(d'-d₁)
6d