Masonry Magazine August 1995 Page. 16
Masonry is now laid up one or two courses, and tensioning rods are threaded into the sleeves. The remaining masonry can then be finished, with a solidly grouted top course to increase bearing strength for post-tensioning. With the proper hardware in place, torque the rods to 30 ft-lbs. You now possess a beautiful and durable solution to your partitioning needs.
Another option available for interior partitioning, when it is acceptable to tie in to the structure above, is the use of vertical steel reinforcement. Unlike post-tensioning, the vertical members do not penetrate the supporting slab. Reinforcing steel is placed into the appropriate cores and then grouted solidly into them. This procedure, in conjunction with bracing the wall at the top, allows the designer to exceed the empirical height limit for interior non-load-bearing masonry walls of 36t.
The accompanying diagram demonstrates the fundamental principles involved. Things that need to be determined by the designer are masonry unit type and size, size and spacing of re-bar and the detail for lateral bracing at the top of the wall. Design tables, complete with re-bar areas already called out, are included in this digest to assist in these considerations.
This system allows the use of tall, thin masonry walls that provide fire-resistance, reduced sound transmission, durability, reduced mainte-Continued on Page 18
Height, Ft.
52
51
Deflection Contr007
Lateral Load-5 pat
I'm 1500 pi
ly 60,000 psi
491-9625
64.812
Wt of Wall
50 49 48 47 46 45 4 15
Seismic Zone 1
10" Concrete
Masonry Units
42
41
40
39
Deflection
Controls
38
37
Strength
Congrats
G
87
7501
2000 pl
Height, Ft.
58
57
56
54
61
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 45 24
50
44
Deffection Control 007 H
Lateral Load 5 pet
m1500 psi
ty 60.000 psi
1-11.005
0-5812
Wt of Wall-75p
Seismic Zone 1
Seismic 4.2 psf
W Wind-5p
Strengt
Controls
12" Concrete
Masonry Units
#10
250
750 р
1000 pf
1500 pill
2000 pl
34
15.2.25 3.35.4.45 .5 .55 .6 .65.7.75.8.85
A, in square inches (s= 32 in.)
41
3 4 5 6 7 8 9 1 1.1 1.2 1.3 1.4 1.5
A, in square inches (s= 48 in.)
16 MASONRY-JULY/AUGUST, 1995