1. : h = 400 .; = 200. (. )
= 250 ;
l ׳1 =4650, l 1 =4700, l ׳2= l 2= 5200.
h = 400400 . ()
p
:
- : l ׳01= l ׳1 0,5 h+ 0,5 = 4650- 0,5400+0,5250=4575.
- : l 01= l 1 =4700-400=4300 .
- p: l ׳01/ l 01= 4575/4300=1,064<1,2
20%, :
l 2= (l ׳2 + l 2)/2 = (4575+4300)/2 = 4437,5.
2. p :
- -
= 200 .
hf =200.
Qg = (h - hf) ρ γf γn + g γn
qg = (0,4-0,2) 0,2251,10,95+5,5040,20,95=2,09 /;
ρ =25/³- .
- p, :
qv = υ= 7,080,2=1,416/.
- :
q = qg + qv = 2,09+1,416=3,506 /.
- , :
q =(g + υ) γn = (5,504+7,08)0,95= 11,955 /².
o1=(q l³ 1)/12=(11,9554,4375³)/12=87,05 ͷ.
3. .
- :
׳1=0,7 o1+(q l² 1)/11=0,787,05+(3,5064,4375²)/11=67,21 ͷ;
- :
1= 0,5 o1+(q l² 1)/16=0,587,05+(3,5064,4375²)/16=47,84 ͷ.
- :
1 ¯ =0,4 1=19,14 ͷ.
:
I.
, ξ= 0,35,
α m = ξ(1-0,5ξ)=0,35(1-0,50,35)= 0,289.
h o= 
h = h o+ p =30.
H =335,2+30=365,2. h =400.
H o=400-30=370.
=(0,3 
0,5) h = 200
- : 
׳ f =min 
- :
׳ f =1633.
-
:
f = R ׳ f hf (h o-0,5 hf)= 0,911,51633140(370-0,5140)= 709,9106 ͷ.
f =709,9 ͷ > ׳1 = 71,36 ͷ.
C < hf
- ( ) ׳ f =1633 .
-
|
|
|
( ) =200.
- :
αm = 
.
- :
ξ = 
.
- :
ξR == 
s,el = 
=0,00135
,ult =0,0035
.. ξ =0,028< ξR =0,58 => .
- :
ζ = 1- 0,5 ξ = 1-0,50,029=0,986
- :
.
:
2Æ22 300 =760 ².
-1-
´ =40, =200.
H o= h - ´ =400-40=360.
Αm = 
.
- :
ξ = 
.
Ξ =0,294 < ξR =0,58 => .
- :
ζ = 1- 0,5 ξ = 1-0,50,294=0,853.
- :
.
:
6Æ14 300 s=923² 2 3 .
- :
=35, ׳ f =1679 .
H o= h - =400-35=365 .
Αm = 
.
- :
ζ = 0,5 (1+ 
) = 
.
- :
.
:
2Æ18 300 s=509².
- :
´ =40, =200.
H o= h - ´ =400-40=360.
Αm = 
.
- :
ξ = 
.
Ξ =0,198 < ξR =0,58 => .
- :
ζ = 1- 0,5 ξ = 1-0,50,198=0,901.
- :
.
:
3Æ16 300 s=603²
- :
´´ =50, =200.
H o= h - ´´ =400-50=350.
Αm = 
.
- :
ζ = 0,5 (1+ ) = 
.
- :
.
:
2Æ12 300 s=226².
