Page 158 - Pressure Vessel Design Manual

136 Pressure Vessel Design Manual

where g = 386 in./sec2 * ~~ Case 1 ~ Case 2
~
6. Design of 1eg.Y. m At Posts Between Posts
F
-I
e Force ut top of vessel, Ft (UBC design only). Horiz. 01,) Vert. (F,) Horiz. (V,) Vert. (F,)
1 0.01 12v FD + FL 0.0209V FD + 0.9659F~
Ft = 0.07TV or 0.25V 2 0.0472V FD + 0.866F~ 0.0834V FD +0.7071 FL
whichever is less or 3 0.1194V FD + 0.5F~ 0.1 458V FD + 0.2588F~
4 0.1 555v FD 0.1458V FD - 0.2588F~
Ft = 0 if T < 0.7sec 5 0.1194V FD - 0.5F~ 0.0834V FD - 0.7071 FL
6 0.0472V FD - 0.866F~ 0.0209V FD - 0.9659F~
e Vertical force, F,. 7 0.01 12v FD - FL 0.0209V FD - 0.9659F~
8 0.0472V FD - 0.866F~ 0.0834V FD - 0.7071 FL
UBC design: F, = W 9 0.1194V FD - 0.5F~ 0.1 458V FD - 0.2588F~
with vertical seismic factor: 10 0.1 555v FD 0.1458V FD - 0.2588F~
11 0.1 194V FD + 0.5F~ 0.0834V FD - 0.7071 FL
F, = UP = (C, - l)W 12 0.0472V FD + 0.866F~ 0.0209V FD +0.9659F~
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= down = (1 + C,)W = (-) 1 0.0048V FD + FL 0.0091V FD +0.9808F~
2 0.021 7v FD+ 0.9239F~ 0.0404V FD + 0.831 ~FL
e Overturning moment at base, M. 3 0.0625V FD+ 0.7071 FL 0.0846V FD + 0.5556F~
4 0.1 034v FD + 0.3827FL 0.1 158V FD + 0.1951 FL
UBC design: M = L(Fh - F,) + HFt 5 0.1 202v FD 0.1 158V FD - 0.1951 FL
Other: M = LFh 6 0.1 034V FD - 0.3827F~ 0.0846V FD - 0.5556F~
7 0.0625V FD - 0.7071 FL 0.0404V FD - 0.831 ~FL
e Axial stress, fa. 8 0.0217v FD - 0.9239F~ 0.0091V FD - 0.9808F~
9 0.0048V FD - FL 0.0091V FD - 0.9808F~
10 0.0217V FD - 0.9239F~ 0.0404V FD - 0.831 ~FL
11 0.0625V FD - 0.7071 FL 0.0846V FD - 0.5556F~
12 0.1034V FD - 0.3827F~ 0.1158V F~-o.1951F~
13 0.1202v FD 0.1 158V FD +0.1951 FL
14 0.1034V FD + 0.3827FL 0.0846V FI, + 0.5556F~
Table 3-12 15 0.0625V FD + 0.7071 FL 0.0404V FD + 0.8315F~
Summary of Loads V, and F, 16 0.0217V FD + 0.9239F~ 0.0091 v FD + 0.9808F~
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Case 1 Case 2
At Posts Between Posts
e Slenderness ratio for legs, SI.
Horiz. (V,) Vert. (F,) Horiz. 01,) Vert. (F,) Klh’
s1 =-
1 0.0833V FD+ FL 0.125V FD + 0.866F~ r
2 0.2083V FO + 0.5F~ 0.25V FD
3 0.2083V FD - 0.5F~ 0.125V FD - 0.866F~ KI = 0.5 to 1.0
4 0.0833V FD - FL 0.125V FD - 0.866F~
5 0.2083V FD - 0.5F~ 0.25V FD e Allowable compressive stress, Fa.
6 0.2083V FD + 0.5F~ 0.125V FD + 0.866F~
1 0.0366V FD + FL 0.0625V FD + 0.9239F~ Fa = from AISC (see App. L)
2 0.125V FI, + 0.707F~ 0.1875V FD + 0.3827F~
3 0.2134V FD 0.1875V FD - 0.3827F~
4 0.125V FD - 0.707F~ 0.0625V FD - 0.9239F~
5 0.0366V FD - FL 0.0625V FD - 0.9239F~
6 0.125V FD - 0.707F~ 0.1875V FD - 0.3827F~
7 0.2134v FO 0.1 875V FD + 0.3827F~ Table 3-13
8 0.125V FD + 0.707F~ 0.0625V FD + 0.9239F~ Dimension, d,
1 0.0191v FD + FL 0.0346V FD + 0.951 1 FL
2 0.0750V FD + 0.809F~ 0.125V FD + 0.5878F~ No. of Legs dl
3 0.1655V FD + 0.309F~ 0.1809V FD 3 0.75d
4 0.1655V FD - 0.309F~ 0.125V FD - 0.5878F~ 4 0.705d
5 0.0750V FD - 0.809F~ 0.0346V FD - 0.951 1 FL 6 0.865d
6 0.0191V FD - FL 0.0346V FD - 0.951 1 FL a 0.925d
7 0.0750V FD - 0.809F~ 0.125V FD - 0.5878F~ 10 0.95d
8 0.1655V FD - 0.309F~ 0.1809V FD 12 0.9654
9 0.1655V FD + 0.309F~ 0.125V FD + 0.5878F~ 16 0.98d
10 0.0750V FD + 0.809F~ 0.0346V FD + 0.951 1 FL