.
|
f= =3,375
l= =13,9
.3
/ | . ., | - , | ., | |
() | 67,4 | 1,05 | 70,8 | |
ó | 1,3 | |||
. | 1,1 | |||
1,1 | ||||
2**h*ρ*g/l1=2*0,06*0,125*500*9,81/1,5 | 49,1 | 1,1 | 54,0 | |
1,1 | ||||
.
:
1. .
2. .
=3
qm=(g+ * =(415,8/s α + 1664)*3=6278/=6,278
s α= =0,970
sin α= =0,243
:
1.
, = 572 *
2. . .
=
=84,75/(2*0,243)=174,5
= * s α=174,5*0,970=169,3
-
|
.
.
=
ζ=1- =1- =1-
ζ .
f= ; Q=
.
NI..= 174,6
NI..= 169,4
ζ=0,85
%5% .
1,5/2*0,9*0,8*0,9*1*0,8=0,778 /2
MqI= =143 *
27 5.
Bmin=90
W= =W
b= =16,4
, b=12, .
b=18
=b*h=90*18=16202
h=5* b=5*18=90
tg=33 .
.
ng=h/3,3=90/3,3=28
h*=3,3; ng=3,3*28=92,4
=b* h*=18*92,4=1663,22
W= 25613 3
λy= =52,1 .
ζ=1- =1- =0,9
N= =1,105*1,5*0,8*0,9*1*0,88*1663,2=1747
φ
m=0,88 h*=92,4 .
.
σ= =0,105+0,045=0,15≤ Rc*=0,95/2
= = =11407 *
M=qI - MN= 14300-N..I*e =14300-174,6*23,1=10266 *
=0,25*h*=0,25*92,4=23,1
|
|
,
1.
2. , I .
3. 0,15h ( ).
.
.
*γ
Ix=11,2 4
W= =7,9 3
0,75
┴= 2
∟505, =4,8 2
.
=400
l=6
ix= l/ =6*100/400=1,5
ix ∟506, ∟506, .
=5.69 2, zo=1,46 , Iy=13.07 4, ix=1,52, q.=4.47 / .
= =394.6 *=39,5 *
10 .
.
|
t=0,5*b+1(2)=180/2+1=100
d=18
S1=7d+10=7*18+10=136.
T1<T2, Q+T1=T2
|
ΣMA=0
qII =0
R→ ΣMA=0
qI= =4.992/
=R, R=4,992*27/8=16.85
, .
T1= ΣM0=0
T1*=Q*S1; Q= RII, ΣM2=0
T1*0,4=16.85*0,136
T1=5.73
Σz=0
-Q +T2-T1=0
T2=T1+Q= 5.73+16.85 = 22.58
.
4- . (. .17 ).
1. =b=18
=0,5/2**d*α1*m*m*m=0,5*18*1.8*0,6*0,8*0,9*1*0.8*0,88=4,93
α1=76, α1=0,6
2. .
=0,8/2**d*α2*m*m*m=0,8*10*1,8*0,55*0,8*0,9*1*0,8=4,56
a=t=10
α2=0,55
3. , .
=(1,8*d2+0,022) =(1,8*1,82+0,02*102) =4,41
4. ( ).
=2,5*d2 =2,5*1,82 =4,76
min=4,41
1 .
n1= =0,65=1
2 , n1≥2
2
n2= =2,56=3
S2min=3,5*d=3,5*18=63
S3=3,0*d=3*18=54
.
=2* S3+2*S2=2*54+2*63=234
.
|
. .
q= =970 /
W=
b=0,5*h=0,5*92,4=46,2
M= =4,56 *
lp= b+ t=180+14=194 =0,194
t= =1,68=16,8
18
.