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INFORMATION

Rectangular Concrete Tanks
While cylindrical shapes may be structurally best for tank construction, rectangular tanks frequently are preferred for specific purposes. Special processes or operations may make circular tanks inconvenient to use.
When several separate cells are required, rectangular tanks can be arranged in less space than circular tanks of the same capacity. Tanks or vats needed inside a building are therefore often made in rectangular or square shapes. For these and other reasons, breweries, tanneries, and paper mills generally use rectangular tanks. Data presented here are for design of rectangular tanks where the walls are subject to hydrostatic pressure of zero at the top and …ver más…

When the artificial restraint is removed these unbalanced moments will induce additional moments in the panels, Adding induced and fixed-end moments at the edge gives final end moments, which must be identical on both sides of the common edge.
Moment distribution cannot be applied as simply to continuous tank walls as it can to framed structures, because moments must be distributed simultaneously along the entire length of the side edge so that moments become equal at both sides at any point of the edge. The problem was simplified and approximated to some extent by distributing moments at four points only: quarter points, midpoint, and top. The end moments in the two intersecting slabs were made identical at these four points and moments at interior points adjusted accordingly.
‘Applicable
tn c ases where wall slab, counterfort, and base slab are a l l built Integrally
“PublIshed by McGraw-HI11
Book Co, New York, 1959

Tables 1, 2, 3, and 4. Moment Coefficients for Slabs with Various Edge Conditions

Table 1

Table 2

Moment = Coef. x wa’

/j

f -lmi_

Moment=Coef.xwa3

d

mlr

Xl

_wa

bla
-

y-o xla y = b/4

MX

MV

3.00

+0.035
+0.057
+0.051

+0.010
+0.016
+0.013

2.50

to031
+0.052
+0047

2.00

y = b/2
4

Y

MV

+0026
+0.044
+0.041

+0.011
+0.017
+0.014

-0.008
-0.013
-0.011

-0.063
-0055

+0.011