, 12.1. 45, , 230; 45, , 200.
[s ] = 410 .
, , y ba = 0,4.
b, , . 3.1. (. . 12.13), , , , : b = 1,25.
( ) = 2 = 11,1 (. . 12.13 I ).
(3.7)
= 43 ; = 5 .
2185-66 aw = 280 .
9563 - 60 mn = 3,5 .
b = 10.
[. (3.12)]
z 1 = 26. z 2 = z 1 = 26 × 5 = 130.
:
b = 12o50'.
.
b2 = y baw = 0,4 280 = 112 . bl = b2 + 5 = 117 .
: 10 / 8- .
. 3.5 y bd = 1,25, < 350 ( b) b 1,165.
. 3.4 v = 1,52 / 8- a 1,065.
. 3.6 5 / v = 1,0.
, = 1,165 × 1,065 × 1,0 = 1,242.
(3.6):
[s ] = 410 . .
, :
[. (3.25)]:
KF = KF b KFv.
. 3.7 y bd = 1,25, < 350 KF b1,32.
|
|
. 3.8 8- 3 / KFv = 1,1.
, KF = 1,32 × 1,1 = 1,45.
YF 1 = 3,84 YF 2 = 3,60.
Y b KF a [. 3.25)];
ea = 1,5; = 8.
(3.24):
. 3.9 45 s0 F lim b = 1,8 .
s0 F lim b = 1,8 × 230 = 415 ;
s0 F lim b = 1,8 × 200 = 360 .
[ Sf ] = [ Sf ]¢ [ Sf ]" [. (3.24)].
. 3.9 [ Sf ]' = 1,75 45 ; [ Sf ]' = 1 . , [ Sf ] = 1,75.
:
, [s f ] / YF . :
[. (3.25)]:
.
IV.