, , , N .
(. 42):
. , , . . - .
- . - , .
- II , - - I . - , .
- . :
s = N/F + M/W (16)
, ,
N/F + M/W * Rc/R £ Rc (17)
F, W - ;
Rc, R - ;
N - ;
- , , .
- (. 43) , :
= o + Nf (18)
- , ;
Nf - N, f.
, :
f = fo * 1/(1 N/N) fo = Mo/N
f - ;
fo - ;
N = p2EI/l2 - . (18), :
M = Mo + Nf = Mo[ 1 + N/N(1 N/N)] = Mo/(1 N/N) = Mo/x
x - , . :
x = 1 - l2 /3100 * N/(Rc*F) (19)
, ,
N/F + (Mo*Rc)/(x*W*R) £ Rc (20)
N/(Rc*F) + Mo/(x*W*R) £ 1 (21)
x 1 0.
, : x = 1 (19) l = 0, ;
|
|
x = 0 , N = (3100/l2)*Rc*F, .
(19) x l < 75 - , j = 3100/l2, l ³ 75.
Q - :
Qo = Qo/x T = To/x = (Qo*S)/(l*x)
Qo - ;
x- , (19).