Design and Stress Analysis of Extraterrestrial ... - The Black Vault

Calculation formulas are valid under the condition:
a) for bottoms without openings 0.2 < (he)/(DO) < 0.3;
b) for bottoms with openings 0.2 0.3, the wall thickness of the bottom is determined
• according to the strength conditions of the bottom's rim.
3•. Round pipe grid (panel) [32].
grid is
Reduced thickness of pipe
• '
(4.17)
where q = 0.9(1 - 0.905(d 2 )/(t 2 ) with triangular division (Fig.
14.37a);
= 0.9(1 - 0.785(d )/(t ) with squared division (Fig. 4.37b);
S is the minimum actual thickness of the grid.
a) Pipe grid with U-shaped bundle of pipes (see Fig. 4.25a).
Maximum stress in center of pipe wall is
Minimum actual wall thickness is
S= 3,1o1. 3 p •
s 3 G50:1
b) Fixed pipe grid (wall) - straight pipe bundle - floating
pipe wall (see Fig. 4.24b). Maximum stress
6Mmat
484