:
d = 1,55d3 = 1,5570 =108 .
:
l = b = 80 ,
:
S = 2,2m+0,05b2 = 2,2×2+0,0580 =8,4
S = 8
:
= 0,25b = 0,2580 = 20
( ) 7.
b = 3 r = 1 .
.
: n = 0,5m = 0,5∙2,0 = 1,0 ,
n = 1,0 .
, , .
23360-78. 510 . 7/r6.
. 0,30,5 , 8752-79. , .
10.5 /2/
d = 0,025 + 3 = 0,025160 + 1 = 5,0 d = 8
b = 1,5d = 1,58 = 12
= 2,35d = 2,358 = 20
:
-
d1 = 0,036a + 12 = 0,036160 + 12 = 18
20;
-
d2 = 0,75d1 = 0,7520 = 15
16;
-
d3 = 0,6d1 = 0,620 = 12
12.
.
d1 =100
de1 = d1 2t =100 2∙1,0 = 98,0
B = (z 1)p + 2f = (16 1)2,4+ 2∙3,5= 43,0
δ = 1,6 = 1,6∙2,35 = 3,76
δ= 4
= (1,21,3)δ = (1,21,3)4 = 4,85,2
= 5 .
d = d = 32
d = 1,6d = 1,6∙32 = 51,2
d = 52
l = l = 80 .
.
d1 = 355
de1 = d1 2t = 355 2∙1,0 = 353
d = d1 = 40
d = 1,6d = 1,6∙40 = 64
d = 64
l = l1 = 50 .
|
|
- 21425-93 [T] =1000 ͷ.
= k1 = 1,5511,7 = 768 ͷ < [T]
10.8 .
.
V = (0,5¸0,8)N = (0,5¸ 0,8)2,94 2,0
v = 0,7 / σ=412 n =2810-6 2/
---68
. 3 /, -1.
11.1
23360-78.
45 .
h ;
t1 ;
l
b .
.
: 12×8×50.
, [σ] = 50 .
σ = 2105,8103/40(8-5,0)(50-12) = 46,4
.
20×12×70. , [σ] = 100 .
σ = 2511,7103/70(12-7,5)(70-20) = 65,0
: 16×10×63. , [σ] = 100 .
σ = 2511,7103/55(10-6,0)(63-16) = 79,2
σ < [σ] , .
11.2
.
F = 0,5DY = 0,5∙1510= 755 H
= 1,5 , =0,3 .
: 30 σ = 500 , σ = 300 ; :
[σ] = 0,25σ = 0,25∙300 = 75 .
Fp = [K(1 ) + ]F = [1,5(1 0,3) + 0,3]755 =1019 H
= πdp2/4 = π(d2 0,94p)2/4 = π(12 0,94∙1,75)2/4 = 84 2
σ = 1,3Fp/A = 1,3∙1019/84 =16 < [σ] = 75
11.3
, A. .
45, : s = 780 [2c34]
:
- s-1 0,43×s = 0,43×780 = 335 ;
- t-1 0,58×s-1 = 0,58×335 = 195 .
|
|
= = 107,1 ͷ
W = πd3/32 = π453/32 = 8,95103 3
Wp = 2W = 28,95103 = 17,9103 3
σv = M/W =107,1103/8,95103 =12,0
tv = tm = T1/2Wp =105,8103/217,9103 = 5,9
:
kσ/eσ = 3,8; kt/et = 0,6 kσ/eσ + 0,4 = 0,63,8 + 0,4 = 2,7
sσ = σ-1/(kσσv/eσ) = 335/3,812,0 = 7,3
st = t-1/(kttv/et + yt tm) = 195/(2,705,9 + 0,15,9) = 11,8
s = sσst/(sσ2 + st2)0,5 = 7,311,8/(7,32 + 11,82)0,5 = 6,2 > [s] = 2,5
, D. .
= 373,3 ͷ.
W = πd3/32 = π603/32 = 21,2103 3
Wp = 2W = 221,2103 =42,4
σv = M/W = 373,3103/21,2103 = 17,6
tv = tm = T2/2Wp =511,7103/242,4103 = 6,0
:
kσ/eσ = 4,4; kt/et = 0,6 kσ/eσ + 0,4 = 0,64,4 + 0,4 = 3,0
sσ = σ-1/(kσσv/eσ) = 335/4,417,6 = 4,3
st = t-1/(kttv/et + yt tm) = 195/(3,006,0 + 0,16,0) =10,5
s = sσst/(sσ2 + st2)0,5 =10,54,3/(4,32 +10,52)0,5 = 4,0 > [s] = 2,5