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

I- I
Let us fIind the safety coefficient of the plate:
tax
We should select n = .1.3-1.5.
Peculiarities in analyzin~g pl~ates bracedand
flexiller-eactor
'
In certain cases, it is immediately apparent that a plate, if
,it is not braced, will either be 'very heavy or will have an extremely
large~deflection under loading. A defl6ction is called large when
it exceeds the thickness of the plate.. In order to avoid this,
we can rigidly connect, by welding the rods, the load-bearing plate
- with the end plate, which has great rigidity due to its shape and
lower heating temperature (Fig. 2.53).
Two end plates connegted thus are analyzed as follows.
elliptical end plat'e to which rods are braced we shall consider
absolutely rigid. Only' the 'plate and the bracing rods are deformed
in
operalion. *We shall assume thlat the rods are placed axisymmetrically
iorming a continuous force ring for a plate attachment.
An
'
(
+
(a)
I Fig. 2.53.
P a
(b)
Diagram of a braced plate.
I
The problem'is statically jndeterminate. We shall solve it
by the structural mechanics method of forces. Let us cut the
qystem at the spot where the rods join the plate; we compensate
for the effect of the rods by force R. An equation is set up using
the method of forces (see Fig. 2-53).
'II.
176
A