4.2
[ ]
F (F=120)
L (L=195 )
W
3, , s=1,5,
[σ]= σ/s = 235/ 1.5= 157
h= 6, B=20, L=195 .
W= = 3
= 58,5
̳ ,
σ= 58,5 < [ ] =157
璺
璺 . 璺 .
τ = ≤ [τ]
, 42
[τ] = 0,6[σ]= 0,6*157=94,2
= 2*k*l = 2*2*20= 802
k
l
4.3 璺 .
, 璺:
τ=
̳
τ= 1,5 < [τ]= 94
4.4
, M, , MW, H 10 30 . G=300.
F F , :
F*+ G*b= 0
F ;
䳿 ;
G ;
b
F= = = 3000
35 σ= 314
[σ]= σ/s =314/3= 105
s=3 , d ≤ 16
σ= F/(πd2)≤ [σ]
d1≥ 2 = 2 = 6.03
8 : d=8 ; d1=6,95 ; d2= 7,42 ;
璺
璺 䳺 䳺 .
, 4.5.
4.5
䳺 ,
σ= /W0
,
= (G+G1)*m= (300+30)*70= 23100 *
m 䳺 ;
W0
|
|
W0= 0,1D3 = 0.1*283= 2195 3
3, , s=1,5,
[σ]= σ/s = 235/ 1.5= 157
( , )
σ= /W0= 23100/2195 = 10,52
̳ ,
σ= 10,52 < [ ] =157
璺
璺 . ֳ 璺 . .
, .
4.6
4.6 .
τ= / S
S
∑= (G+G1)*b K*D/2 = 0
= = =5892
S = K/ [τ]= 5892/94,2= 62,5 2
[τ] = 0,6[σ]= 0,6*157=94,2
, .
S=
d =2 = 2 = 8,9
10
. , . .