,
,
: , - .
1.
1,5- 3 . .
.
=L/n=1400/14=1,0 .
.
L= 108, 118 .
P=20/2; t=10 .
t = 10.
, 13 78,5
g=1,0*78,5=78,5/2=0,77/2.
.
qn=(p+g)*=(20+0,77)*1=20,77/=0,2077/.
(P=20/2).
.
q=(np +ngg)*1=(1,2*20+1,05*0,77)*1=24,8/.
n (n=1,2).
( l=5,5)
max=ql2/8=24,8*72/8=151,9*=15190*.
( Ry =255=25,0/2 255)
W=Mmax/c1*Ry*γ=15190/1,1*25*1=552,363
36 Wx=7433, g=48,6/, Ix=133804, =145
, Wx=7433>W =552,363
L= 
100-14,5/2=92,7<108
.
f<(1/250)l=2,3<2,8
. , - .
, .
|
|
|
1 2 .
- g/a1=48,6/1,0=48,6/2
78,5+48,6=127,1 /2
2.
.
1=/n=700/7=100<108.
.
l= 3,5
.
qn=(p+g)*1=(20+0,77)*1,0=20,77/=0,2077/.
.
q=(np +ngg)*1=(1,2*20+1,05*0,77)*1,0=24,8/.
( l=3)
max=ql2/8=24,8*3,52/8=37,97*=3797*.
.
W=Mmax/c1*Ry*γ=3797/1,1*25*1=138,073
20 Wx=1843, g=21/, Ix=18404,
, Wx=1843>W = 138,073
.
f<(1/250)l=1,07<1,4
.
-, 5.
.
q=(20+0,77+21/102/1)*3,5=73,41/=0,73/
q={1.2*20+1.05*(0,77+21/102/1)}*3,5=87,6/.
( Ry=250=25,0/2 255).
=ql2/8=87,6*72/8=536,5*.
W=53650/1,1*25*1=1950,93.
55 Wx=20353, g=92,6/, Ix=559624, b=180=18.
, . , . l0=100.
, :
:
1<h/b=55/18=3,05<6; b/t=18/1,65=10,9<35
l/2 = τ = 0 c1= c
δ={1-0,7*(1-1)/(-1)}=0,3
5,6>100/18=5,5 , .
2 .
78,5+21/1,0+92,6/3,5=125,9/2
;1 , 125,9/2<127,1/2
.
. f ≤ (1/400)L 275, t ≤ 20 R=275=27/2 R=0,58*27=15,66/2.
g=1,25/2, 2 % . h.=2 .
:
qn=1,25(pn+gn)b=1,25(20*1,25)*7=218,75/;
q=(γp +γgg)=1,02(1,2*20+1,05*1,25)*7=221,46/.
|
|
|
.
max=ql2/8=221,46*142/8=5425*
.
. , 1==1,1
:
1. , t=9.
2. :
:
, hmin hopt. h = 150.
:
- :
- :
, :
(14), , .
. .
, t =2,2.
, .
, . .
:
,
hef=htf=1502,2=147,8c.
500×22, 
=1,101. =1,1.
() :
.
.
:
