, , . , (. 12.4).
(. . 12.14 3.5) . , 12.4: F = 8,55 ; v = 1,3 /; D = 400 . , ; ; .
: 40 270 40 245.
KHL= 1. [ SH ] = 1,15.
. 3.2 s H lim b = 2 + 70.
:
( , ) [. (3.10)]
= 3,15.
:
1 =126 × 103 ×;
2= 400 × 103 ×.
, , . 3.1 b = 1,35.
( )
(3.29)
Kd = 86;
12289-76 de 2 = 280 . , d 2 = 315 .
z1 = 25. z2 = z1 = = 25 ×3,15 = 78,75.
12289 76 ( 3 %).
te. . te = 3,55 .
Re b
|
|
b n = 35o.
7- , .
. 3.5 b = 1,23;
. 3.4 a = 1,04;
. 3.6 KH v = 1,00.
, = 1,23×1,04×1,00 = 1,28.
[. (3.27)]
KF = KF b KFv = 1,375.
. 3.7 F b = 1,375; . 3.8 KFv = 1,0.
YF :
YF 1= 3,665 YF 2 = 3,60.
Yb :
F a .
= 7 ; ea = 1,3.
. 3.9 40 < 350 s0 H lim b = 1,8 ; s0 H lim b 1 = 1,8 × 270 = 490 ; s H lim b 2 = 1,8 × 245 = 440 .
[ SF ] = [ SF ]' [ SF ]" = 1,75 ( , . . 344).
: [s F ] / YF:
,
:
, .