Masonry Magazine October 1993 Page. 31
Beams
cracked section properties such as k and j must be determined based on the amount of reinforcement, the moduli ratio and the loading conditions. Pilasters which are loaded both out-of-plane and in-plane must be designed considering the interaction of axial load and bending moment, which may be accomplished by the use of a moment-load interaction diagram. The method of development of a moment-load interaction diagram is beyond the scope of this Technical Notes.
Reinforced brick masonry beams may be used to span over wall openings such as windows and doors. Brick masonry beams provide a number of advantages over precast concrete or steel lintels. For example, brick masonry beams are a more efficient use of materials and produce a visually appealing brick masonry soffit. Some typical brick masonry beam configurations and their section properties are given in Technical Notes 17H and 17J.
TABLE 6
Column Section Properties
COLUMN NO. 1
7 X 11%
(191 mm X 292 mm)
COLUMN NO. 2
7 X 15%
(191 mm X 394 mm)
COLUMN NO. 3
11 X 11%
(292 mm X 292 mm)
COLUMN NO. 4
15% X 15%
(394 mm X 394 mm)
COLUMN NO. 5
19% X 19%
(496 mm X 496 mm)
COLUMN NO. 6
23% X 23%
(597 mm X 597 mm)
Column
No.
A
in.² (mm²)
L
in.
min
(x105 m²)
in.(mm)
Qmin
in.3
(x105 m³)
0.0025A
in.2 (mm²)
0.04A
in.² (mm²)
1
86.3
(55 700)
404
2.16
(16.8)
(55.0)
80.9
(133)
0.27
(139)
3.45
(2230)
2
116
(74 800)
545
2.17
(22.7)
(55.1)
109
(179)
0.29
4.64
(187)
(2990)
3
132
1460
3.32
190
0.33
5.28
(85 200)
(60.7)
(84.3)
(311)
(213)
(3410)
4
240
4810
4.48
465
0.60
(155 000)
(200)
(114)
(762)
(387)
9.60
(6 190)
5
380
12 000
5.63
927
0.95
15.2
(245 000)
(502)
(143)
(1520)
(613)
(9810)
6
552
(356 000)
25 400
(1060)
6.79
1620
1.38
22.1
(172)
(2660)
(890)
(14 300)
MASONRY-SEPTEMBER/OCTOBER, 1993 31