3.20. , (, . .), :
) (. 5, ), ..
(27)
. 3.15 3.17;
) (. 5, ), .. (27) ,
(28)
(29)
x R h 0 (. . 18 19).
³ x R h 0, (28)
(30)
a R . . 18 19.
. 3.16.
: 1. 
.
2. 
, , . 3.23.
. 5.
;
3.21.
(31)
a R . . 18 19.
3.22. :
) , . .
(32)
. 3.18 3.19;
) , . . (32) ,
(33)
x . 20
(34)
a m £ a R (. . 18 19).
3.23 (3.16). , 1/6 :
) 
;
) ( , ) 
) :
² 
² 
.
2. : b = 300 , h = 600 ; a = 40 ; g b 2 = 0,9 ( ); = 200 ; 15 (Rb = 7,7 ); A-II (Rs = 280 ).
.
. H 0 = 600 40 = 560 . . 3.18. (22) a m:
. 18 15 A-II g b 2 = 0,9 a R = 0,449.
|
|
|
a m = 0,276 < a R = 0,449, .
. 20 a m = 0,276 z = 0,835.
(23):
2 Æ 28 + 1 Æ 25 (As = 1598 2).
3. : b = 300 , h = 800 ; = 70 ; A-III (Rs = 365 ); s = 2945 2 (6 Æ 25); g b 2 = 0,9 ( ); 25 (Rb = 13 ); = 550 .
.
. H 0 = 800 70 = 730 . . 3.17.
:
. 18 25 A-III g b 2 = 0,9 x R = 0,604.
(20):
. . .
4. : b = 300 , h = 800 ; = 50 ; -III (Rs = Rsc = 365 ); II = 780 ; I = 670 ; 15 (Rb = 8,5 g b 2 = 1,0).
.
, . 3.1.
Rb = 8,5 1,05 = 8,93 .
h 0 = 800 50 = 750 .
. 3.18. (22) a m:
a m = 0,518 > a R = 0,42 (. . 18 g b 2 = 1,0), . . 3.19.
' = 30 , (24) (25) :
= 763 2 (3 Æ 18); As = 4021 2 (5 Æ 32).
5. : b = 300 , h = 700 ; = 50 , ' = 30 ; 30 (Rb = 15,5 g b 2 = 0,9); A-III (Rs = 365 ); 
= 942 2 (3 Æ 20); = 580 .
.
. h 0 = 700 50 = 650 . . 3.19.
a m:
a m = 0,187 < a R = 0,413 (. . 18).
. 20 a m = 0,187 x = 0,21. (26):
3 Æ 36 (Rs = 3054 2).
6. : b = 300 , h = 700 ; a = 70 , a = 30 ; 25 (Rb = 13 g b 2 = 0,9); A-III (Rs = Rsc = 365 ); As = 4826 2 (6 Æ 32), 
= 339 2 (3 Æ 12); = 600 .
.
. h 0 = 700 70 = 630 . . 3.15.
(16) :
. 18 x R = 0,604 a R = 0,422.
|
|
|
= 420 > x R h 0 = 0,604 630 = 380 , (18):
. . .
7. : = 1500 , = 50, b = 200 , h = 400 ; a = 40 ; 25 (Rb = 13 g b 2 = 0,9); A-III (Rs = 365 ); = 300 .
.
. h 0 = 400 40 = 360 . . 3.22 , .
(32), = 0; 
= 13 1500 50 (360 0,5 50) = 326,6 106 = 326,6 > = 300 , . . , b = 
= 1500 . 3.18. a m:
(. . 18),
. . .
(23). . 20 a m = 0,1 19 z = 0,938,
2.
4 Æ 28 (As = 2463 2).
8. : = 400 , = 120 , b = 200 , h = 600 ; a = 60 ; 15 (Rb = 7,7 g b 2 = 0,9); A-III (Rs = 365 ); M = 270 .
.
. h 0 = 600 60 = 540 . . 3.22 , .
= 7,7 400 120 (540 0,5 120) = 177,4 106 = 177,4 < = 270 , . . , (33).
a m:
(. . 18), , .
. 20 a m = 0,404 x = 0,563,
4 Æ 25 (As = 1964 2).
9. : = 400 , = 100 , b = 200 , h = 600 ; a = 70 ; 25 (Rb = 13 g b 2 = 0,9); A-III (Rs = 365 ); s = 1964 2 (4 Æ 25); = 0; = 300 .
.
. h 0 = 600 70 = 530 . . 3.20, = 0. RsAs = 365 1964 = 716 860 H > 
= 13 400 100 = 520 000 H, . (28).
(29) :
(x R . 18);
. . .
