, . 3.4.
(, 120 ).
. 3.3 40 270; 40 245.
[ (3.9)]
. 3.2 s H lim b = 2 + 70 = 2 × 245 + 70 = = 560 .
KHL = 1.
[ SH ] = 1,15.
b b= 1,35 (. . 3.1).
y bRe = 0,285 ( 12289-76).
[ (3.29)]
Kd = 99; = u = 3,15;
12289-76 d 2=315 .
z 1 25.
z 2 = 79.
12289 76 3%.
( ).
, 2%.
Re b:
b = 48 .
( )
7- .
:
. 3.5 y bd = 0,56, < 350 , , H b= 1,23.
, , a = 1,0 (. . 3.4).
, , v £ 5 / v = 1,05 (. . 3.6).
, = 1,23 . 1,0 . 1,05 = 1,30.
(3.27):
, ,
, ,
[. (3.31),]:
F = F b Fv.
. 3.7 y bd = 0,56, , HR < 350 F b = 1,38.
|
|
. 3.8 < 350, v = 4,35 / 7- Fv = 1,45( 8- . 53).
, F = 1,38 × 1,45 = 2,00.
YF 1 = 3,88 Yf 2= 3,60.
. 3.9 40 < 350 s0 F lim b = 1,8 .
s0 F lim b 1 = 1,8 × 270 490 ;
s0 F lim b 2 = 1,8 × 245 = 440 .
[ Sf ] = [ Sf ]' [ Sf ]". . 3.9 [ Sf ]' = 1,75; [ Sf ]" = 1. , [ Sf ] = 1,75 1 = 1,75.
:
, .
: