Page 40 - Pressure Vessel Design Manual

26 Pressure Vessel Design Manual

Table 2-1 b
Moment of Inertia of Bar Stiffeners
Thk Max, Height, h, in.
t, in. ht, in.
1 1% 2 2% 3 3% 4 4% 5 5% 6 6% 7 7% 8
'I4 2 0.020 0.070 0.167
0.250 0.375 0.5
5116 2.5 0.026 0.088 0.208 0.407
0.313 0.469 0.625 0.781 ~ r[ThS,
"I8 3 0.031 0.105 0.25 0.488 0.844
th3
0.375 0.563 0.75 0.938 1.125 I= -
7/16 3.5 0.123 0.292 0.570 0.984 1.563 12
0.656 0.875 1.094 1.313 1.531
4 0.141 0.333 0.651 1.125 1.786 2.667
0.75 1.00 1.25 1.50 1.75 2.00

'lI6 4.5 0.375 0.732 1.266 2.00 3.00 4.271
1.125 1.406 1.688 1.969 2.25 2.53
"8 5 0.814 1.41 2.23 3.33 4.75 6.510
1.563 1.875 2.188 2.50 2.813 3.125
11
116 5.5 1.55 2.46 3.67 5.22 7.16 9.53
2.063 2.406 2.75 3.094 3.438 3.78
'I4 6 1.69 2.68 4.00 5.70 7.81 10.40 13.5
2.25 2.625 3.00 3.375 3.75 4.125 4.50
l3lI6 6.5 2.90 4.33 6.17 8.46 11.26 14.63 18.59
2.844 3.25 3.656 4.063 4.469 4.875 5.281
7 4.67 6.64 9.11 12.13 15.75 20.02 25.01
3.50 3.94 4.375 4.813 5.25 5.688 6.125
_______
1 8 5.33 7.59 10.42 13.86 18.00 22.89 28.58 35.16 42.67
4.00 4.50 5.00 5.50 6.00 6.50 7.00 7.50 8.00
Note: Upper value in table is the moment of inertia. Lower value is the area