. . 3.38 (50) , , , (68).
(. . 29).
(52) Mb 1, jb 2 = 2 (. . 21) jf = 0:
.
qsw :
/ (/).
(. . 29), qinc:
/,
, q 1 = 0,
,
c 0 = c = 556 .
, = 556 h 0 :
.
2 h 0 = 2 510 > c 0 = 558 , c 0 = 556 .
Mb :
. . .
, , (56) c 0, h 0 = 650 50 = 600 :
;
c 0 = 2 h 0 = 1200 .
c 0 = 1200 > = 800 , . , .
19. : 36 , h = 160 , ; v = 50 /2; g = 9 /2; a = 20 ; 25 (Rbt = 0,95 g b 2 = 0,9).
.
. h 0 = h = 160 20 = 140 . b = 1 = 1000 , l = 3 ; q = v + g = 50 + 9 = 59 /.
:
.
(71):
(72). , cmax a = 1 + 0,05 b/h = 1 + 0,05 6/0,16 > 1,25 ( b = 6 ), . . a = 1,25:
.
. 3.32 :
(. . 21).
356 / > q 1 = 34 /, = cmax = 280 = 0,28 .
Q = Qmax q 1 c = 88,5 34 0,28 = 79 .
. . .
20. : 262 ( ) 120 ( ), 4,25 ; , , q 0 = 69 /2 q = 7 /2 ; = 22 ; 15 (Rbt = 0,82 g b 2 = 1,1).
.
|
|
. h 01 = 262 22 = 240.
tg b (b ):
b = 1 = 1000 .
. 3.40. :
.
(71), h 0 = h 01 = 240 :
. . .
, 5 h, cmax a = 1,25:
.
cmax = 464 q 1 = 69 (69 7) = 65,6 /.
. 21 jb 4 =1,5.
= 464 , = max = 464 .
(. . h 0 ):
.
== 464 :
.
(72):
,
. . .
21. : l = 5,5 q = 29 /; . 30; 15 (Rb = 7,7 ; Rbt = 0,67 g b 2 = 0,9); -III (Rs = 365 ), As = 982 2 (2 Æ 25) = 226 2 (2 Æ 12); -I (Rsw = 175 ), 6 , s = 150 .
.