Appendix C - Masonry Wall Weights & Section Properties |
  
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Appendix C - Masonry Wall Weights & Section Properties |
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Per ASTM C90-06 - "Standard Specification for Loadbearing Concrete Masonry Units" and NCMA TEK 14-01B "Section Properties Of Concrete Masonry Walls".
Weights of Masonry Walls (pcf)
|
Concrete Masonry Unit Wall Thickness |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Lightweight (103 pcf) |
Medium Weight (115 pcf) |
Normal Weight (135 pcf) |
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Grout Spacing |
6" |
8" |
10" |
12" |
6" |
8" |
10" |
12" |
6" |
8" |
10" |
12" |
8"oc (solid) |
52 |
75 |
93 |
118 |
58 |
78 |
98 |
124 |
63 |
84 |
104 |
133 |
16"oc |
41 |
60 |
69 |
88 |
47 |
63 |
80 |
94 |
52 |
66 |
86 |
103 |
24"oc |
37 |
55 |
61 |
79 |
43 |
58 |
72 |
85 |
46 |
61 |
78 |
94 |
32"oc |
36 |
52 |
57 |
74 |
42 |
55 |
68 |
80 |
47 |
58 |
74 |
89 |
40"oc |
35 |
50 |
55 |
71 |
41 |
53 |
66 |
77 |
46 |
56 |
72 |
86 |
48"oc |
34 |
49 |
53 |
69 |
40 |
45 |
64 |
75 |
45 |
55 |
70 |
83 |
Net Equivalent Solid Thickness (EST) - Mortar at Face Shells Only (in)
|
Concrete Masonry Unit Wall Thickness |
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|---|---|---|---|---|---|---|
Grout Spacing |
6" |
8" |
10" |
12" |
14" |
16" |
8"oc (solid) |
5.625 |
7.625 |
9.625 |
11.625 |
13.625 |
15.625 |
16"oc |
3.883 |
5.167 |
6.233 |
7.275 |
8.325 |
9.367 |
24"oc |
3.258 |
4.275 |
4.983 |
5.683 |
6.383 |
7.083 |
32"oc |
2.942 |
3.833 |
4.367 |
4.892 |
5.408 |
5.933 |
40"oc |
2.750 |
3.567 |
3.992 |
4.408 |
4.833 |
5.250 |
48"oc |
2.625 |
3.392 |
3.742 |
4.092 |
4.442 |
4.792 |
Average Equivalent Solid Thickness (EST) - Mortar at Face Shells Only (in)
|
Concrete Masonry Unit Wall Thickness |
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|---|---|---|---|---|---|---|
Grout Spacing |
6" |
8" |
10" |
12" |
14" |
16" |
8"oc (solid) |
5.625 |
7.625 |
9.625 |
11.625 |
13.625 |
15.625 |
16"oc |
4.108 |
5.483 |
6.733 |
7.917 |
9.108 |
10.292 |
24"oc |
3.633 |
4.808 |
5.825 |
6.750 |
7.683 |
8.617 |
32"oc |
3.392 |
4.475 |
5.367 |
6.175 |
6.975 |
7.783 |
40"oc |
3.250 |
4.267 |
5.092 |
5.825 |
6.550 |
7.275 |
48"oc |
3.158 |
4.133 |
4.908 |
5.592 |
6.267 |
6.942 |
Moment of Inertia of Net Cross-Sectional Area of Masonry, In (in4/ft)
|
Concrete Masonry Unit Wall Thickness |
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|---|---|---|---|---|---|---|
Grout Spacing |
6" |
8" |
10" |
12" |
14" |
16" |
8"oc (solid) |
178.0 |
443.3 |
891.7 |
1571.0 |
2529.4 |
3814.7 |
16"oc |
155.1 |
378.6 |
719.3 |
1208.9 |
1873.2 |
2737.2 |
24"oc |
146.8 |
355.3 |
656.2 |
1076.3 |
1632.9 |
2342.7 |
32"oc |
142.7 |
343.7 |
624.6 |
1010.1 |
1512.8 |
2145.5 |
40"oc |
140.2 |
336.7 |
605.7 |
970.3 |
1440.7 |
2027.1 |
48"oc |
138.6 |
332.0 |
593.1 |
943.8 |
1392.7 |
1948.2 |
Radius of Gyration of the Average Cross-Sectional Area of Masonry, rave (in)
|
Concrete Masonry Unit Wall Thickness |
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|---|---|---|---|---|---|---|
Grout Spacing |
6" |
8" |
10" |
12" |
14" |
16" |
8"oc (solid) |
1.62 |
2.20 |
2.78 |
3.36 |
3.93 |
4.51 |
16"oc |
1.79 |
2.43 |
3.04 |
3.64 |
4.25 |
4.84 |
24"oc |
1.87 |
2.53 |
3.16 |
3.79 |
4.41 |
5.02 |
32"oc |
1.91 |
2.59 |
3.24 |
3.88 |
4.51 |
5.14 |
40"oc |
1.94 |
2.63 |
3.29 |
3.95 |
4.59 |
5.22 |
48"oc |
1.96 |
2.66 |
3.33 |
3.99 |
4.64 |
5.28 |
72"oc |
2.00 |
2.71 |
3.39 |
4.07 |
4.74 |
5.39 |
96"oc |
2.02 |
2.74 |
3.43 |
4.12 |
4.79 |
5.45 |
120"oc |
2.03 |
2.76 |
3.45 |
4.15 |
4.83 |
5.49 |
Face-Shell Thickness of Masonry, tfs (in)
Concrete Masonry Unit Wall Thickness |
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|---|---|---|---|---|---|
6" |
8" |
10" |
12" |
14" |
16" |
1.00 |
1.25 |
1.25 |
1.25 |
1.25 |
1.25 |
Compression Section Width for Partially Grouted Walls, bw
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|
Concrete Masonry Unit Wall Thickness |
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|---|---|---|---|---|---|---|---|---|
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|
6" |
8" |
10" |
12" |
14" |
16" |
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bcell |
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|
6.3125" |
6.3125" |
6.125" |
6.125" |
6.125" |
6.125" |
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Grout Spacing |
nopen |
bw / b |
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8"oc (solid) |
0 |
1.000 |
1.000 |
1.000 |
1.000 |
1.000 |
1.000 |
|
16"oc |
1 |
0.605 |
0.605 |
0.617 |
0.617 |
0.617 |
0.617 |
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24"oc |
2 |
0.474 |
0.474 |
0.490 |
0.490 |
0.490 |
0.490 |
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32"oc |
3 |
0.408 |
0.408 |
0.426 |
0.426 |
0.426 |
0.426 |
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40"oc |
4 |
0.369 |
0.369 |
0.388 |
0.388 |
0.388 |
0.388 |
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48"oc |
5 |
0.342 |
0.342 |
0.362 |
0.362 |
0.362 |
0.362 |
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72"oc |
8 |
0.299 |
0.299 |
0.319 |
0.319 |
0.319 |
0.319 |
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96"oc |
11 |
0.277 |
0.277 |
0.298 |
0.298 |
0.298 |
0.298 |
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120"oc |
14 |
0.264 |
0.264 |
0.285 |
0.285 |
0.285 |
0.285 |
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Definitions: |
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bcell |
= width of a single open cell |
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nopen |
= total number of open (ungrouted) cells within the unit width of compression section |
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= (Grout Spacing) / 8" - 1 |
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b |
= unit width of compression section |
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bw |
= unit width of the compression section minus the sum of the length of open (ungrouted) cells |
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= b - nopen * bcell |
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bw / b |
= (b - nopen * bcell) / b = 1 - (nopen * bcell) / b |
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