2
1 P 
2 n2
III
 | |||
 | |||
 |
aω
II
P3 n3
1-; 2-
;
;
;
;
, 2.1
2.1
| , | n, -1 | ω, -1 | ||
| 9.02 | 560.8 | 58.7 | ||
| 8.7 | 14.7 |
.
σ . < [σ] , σF < [σ]F,
σ . σF ;
[σ] [σ]F .
σ < [σ] 10% σ .< [σ] 5%.
0.9[σ]F < σF1 < 1.05[σ]F
2.5.1 .
< 10, : m40x =248, : m40x =285. 1=2+(20-50)=285-248=37 .
2.5.2
, , .
[σ]=1.8+67
HL=FL=1,0
[σ]1= HL[σ]+67=1,0 1,8 285+67=580
[σ]2= HL[σ]2+67=1,0 1,8 249+67=514
:
[σ]=0.45([σ]1+[σ]2)=0.45(580+514)=493
: [σ]Fo=1.03
[σ]F1= KFL[σ]F1=1 1.03 285=294
[σ]F2= KFL[σ]F2=1 1.03 248=256
2.5.3
ω=L(u+1) 
,
ω=430(4+1) 
160
2.5.4
mn=(0.010.02) ω=1,63,2
mn=2,0
Z1= 
β- , 10; cos10o=0,98,
Z1= 
Z1=31
Z2= Z1 U=31* 4=124
U: 
β: 
:
|
|
|
d1= mnZ1/cosβ=2,0 *31/0.9687=64
d2=mnZ2 /cosβ=2,0 * 124/0,9687=256
da1=d1+2mn=64+2 * 2=68
da2=d2+2mn=256+2 * 2=260
df1=d1-2,5mn=64-2,5 * 2=59
df2=d2-2,5mn=256-2,5 * 2=251
:
b2= ω ψba=160 * 0.4=64
b2=65
b1=b2+(5-10)=75
.
2.1 -
| ,β | ||
| , Z | ||
| ,d | ||
| , da | ||
| , df | ||
| b, |
|
ω= 
.
2.5.5
|
:
:
Fr=Ft tgα/cosβ
α-200; tg200=0,364
Fr=4800 0,364/0,9696=1801H
:
Fα= Fr tgβ=4800 /0,2568=1233H
2.5.6 :
) :
k-376-
α=1.22 - .
β=1.04 -
v=1.02 -
σ=478<[σ]=493
)
σf2=f2β 
Zv1=z1/cos3β=31/0.96963=35.2 Zv1 =35
Zv2=z2/cos3β=124/0.96963=140.9 Zv2 =141
β=1- β/1400=0.89
σf2=139<[σ]
σf1= σf2 f1/ f2=144
.
: , .
