This section is from the book "Safe Building", by Louis De Coppet Berg. Also available from Amazon: Code Check: An Illustrated Guide to Building a Safe House.
this Table, see Table XIX.
Axis Parallel to One Side. | |||||
xnci via. (r) | (r) | (ρ2) | Distance of Centre of Gravity from Base. | Transverse Value (v) in lbs. | |
Tor Iron. | For Steel. | ||||
46 | 7.54 | 3.24 | 1.860 | 60350 | 75400 |
91 | 7.01 | 3.28 | 1.820 | 56100 | 70100 |
91 | 4.61 | 3.46 | 1.685 | 36900 | 46100 |
22 | 3.90 | 3.42 | 1.580 | 31200 | 39000 |
64 | 4.97 | 2.19 | 1.610 | 39760 | 49700 |
70 | 3.94 | 2.37 | 1.550 | 31550 | 39400 |
35 | 2.64 | 2.52 | 1.460 | 21100 | 26400 |
20 | 3.28 | 1.80 | 1.396 | 26250 | 32800 |
20 | 2.24 | 1.92 | 1.286 | 18000 | 22400 |
66 | 2.47 | 1.40 | 1.271 | 19800 | 24700 |
18 | 2.32 | 1.39 | 1.220 | 18550 | 23200 |
36 | 1.52 | 1.52 | 1.138 | 12200 | 15200 |
38 | 2.40 | 1.21 | 1.220 | 19200 | 24000 |
68 | 1.74 | 1.08 | 1.122 | 13920 | 17400 |
86 | 1.15 | 1.15 | 1.013 | 9200 | 11500 |
80 | .90 | 1.12 | .930 | 7200 | 9000 |
77 | 1.13 | .76 | .996 | 9040 | 11300 |
23 | .90 | .79 | .930 | 7680 | 9600 |
24 | .58 | .86 | .842 | 4640 | 5800 |
33 | .79 | .66 | .887 | 6320 | 7900 |
15 | .59 | .71 | .802 | 4720 | 5900 |
95 | .48 | .72 | .780 | 3840 | 4800 |
22 | .61 | .52 | .770 | 4880 | 6100 |
28 | .66 | .57 | .806 | 5280 | 6600 |
70 | .39 | .59 | .717 | 3120 | 3900 |
62 | .34 | .59 | .700 | 2720 | 3400 |
82 | .46 | .45 | .740 | 3680 | 4600 |
78 | .45 | .44 | .720 | 3600 | 4500 |
50 | .31 | .47 | .654 | 2480 | 3100 |
40 | .26 | .50 | .690 | 2080 | 2600 |
78 | .51 | .38 | .730 | 4080 | 5100 |
45 | .30 | .33 | .634 | 2400 | 3000 |
31 | .22 | .33 | .580 | 1765 | 2200 |
27 | .19 | .38 | .570 | 1520 | 1900 |
48 | .35 | .31 | .640 | 2800 | 3500 |
27 | .20 | .27 | .550 | 1600 | 2000 |
8 | .15 | .29 | .507 | 1200 | 1500 |
9 | .17 | .19 | .510 | 1360 | 1700 |
6 | .14 | .19 | .487 | 1120 | 1400 |
4 | .12 | .19 | .450 | 960 | 1200 |
1 | .10 | .21 | .444 | 800 | 1000 |
9 | .085 | .21 | .440 | 680 | 850 |
23 | .126 | .152 | .460 | 1010 | 1260 |
77 | .079 | .138 | .404 | 632 | 790 |
44 | .050 | .147 | .358 | 400 | 500 |
37 | .047 | .084 | .340 | 376 | 470 |
30 | .040 | .084 | .310 | 320 | 400 |
22 | .031 | .096 | .296 | 250 | 310 |
19 | .029 | .066 | .286 | 232 | 290 |
14 | .023 | .070 | . 264 | 184 | 230 |
12 | .021 | .048 | .254 | 168 | 210 |
09 | .017 | .053 | .233 | 136 | 170 |
Axis at 46°. | |
Moment of Intertia. (r) | Square of Radius of Gyration. (ρ2) |
15 | 1.37 |
13.10 | 1.34 |
7.75 | 1.35 |
6.77 | 1.35 |
8.67 | .96 |
6.07 | .98 |
3.77 | 1.02 |
4.88 | .772 |
2.65 | .707 |
3.45 | .634 |
3.01 | .624 |
1.86 | .650 |
2.40 | .470 |
2.04 | .470 |
1.20 | . 184 |
.95 | 462 |
1.05 | 338 |
.95 | .336 |
.52 | .361 |
.61 | .300 |
.50 | .309 |
.39 | .303 |
.52 | .221 |
.51 | .227 |
.30 | .252 |
.25 | .240 |
.35 | .194 |
.35 | .197 |
.22 | .208 |
.17 | .212 |
.28 | .150 |
.21 | .154 |
.13 | .158 |
.11 | .160 |
.18 | .120 |
.12 | .120 |
.08 | .129 |
.09 | .096 |
.07 | .083 |
.06 | .081 |
.05 | .094 |
.04 | .081 |
.05 | .070 |
.04 | .071 |
.02 | .067 |
.02 | .045 |
.01 | .040 |
.01 | .043 |
.. | ... |
.. | ... |
... | ... |
... | ... |
 
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