, (. . III, . 3.3); 45, , 230; - 45, -, 30 200.
[ (3.9)]
s lim b
. 3.2 . III 350 ()
s lim b = 2 + 70
HL ; , , HL = 1; [ SH ] = 1,10.
(3.10) . III.
[s ] = 0,45 ([s 1] + [s 2]);
482
428 .
[s ] = 0,45 (482 + 428) = 410 .
[s ] £ 1,23 [s 2] .
b, (. . 12.2), , , . . 3.1, , b = 1,25.
-
(3.7) . III
= 43, = = 5.
2185-66 aw = 200 .
:
= (0,01 ¸ 0,02) aw = (0,01 ¸ 0,02) 200 = 2 ¸ 4 ;
9563 60* = 2,5 .
b = 10 [. (3.16)]:
z 1 = 26; z 2 = z 1 = 26 . 5 = 130.
:
:
b2 = y baaw = 0,4 . 200 = 80 :
b1 = b2 + 5 = 85 .
:
a 8- .
|
|
b . 3.5; y bd = 1,275, £ 350 b1,155.
. 3.4 . III v = 3,38 / 8- a 1,08. . 3.6 v £ 5 / v = 1,0. , = 1,155 1,08 1,0 = 1,245.
(3.6):
Fa = Ft tgb = 3750 tg 1250' = 830 H.
(3.25):
(3.24)
. 3.9. 45 £ 350 s0 F lim b = 1,8 .
s0 F lim b = 1,8 . 200 = 360 . [ SF ] = [ SF ]¢ [ SF ]¢¢ - [. (3.24)], [ SF ]¢ = 1,75 ( . 3.9), [ SF ]¢¢ = 1 ( ). , [ SF ] = 1,75.
, .
Y b KF a [. . III, (3.25)]:
ea = 1,5 8- KF a = 0,92.
(3.25):
.