:
(20%):
;
(80%):
;
0,2 /2 30 .
, , .
, 
; 
.
1 2
,
S0= 1,2 - . .7 
II;
= 1- , . 5.3 - 5.6 [4].
:
:
FS=0,5 gs L=0,5∙6,8436=123,12 .
:
;
Dmax=0,95(1,10,853201,866+1,111+1,11,51,06)=551,28;
- 1, 3;
- 1-3 ;
Fn,max=320 ..2;, 30 1-3. i . , ..2.
∑yi=1,866;
Gc= 11 - ( ..6).
:
Dmin=0,95(1,10,851071,866+1,111+1,11,51,06)=198,24;
Q = Q0 g = 30 10 = 300 ;
Gc =554 ;
Q0=30 - ..2;
g=10 /2 - ;
n0 = 2
:Mmax = Dmax e = 551,28 0,5 = 275,64 ͷ;
Mmin = Dmin e =198,24 0,5 = 99,12 ͷ,
= 0,5 h1 =0,51,0=0,5 - .
2.5.
;
-
f = 0,05 - (1-3) . .2.
() , .
- ;
w0=0,38/2 - ..10.;
= 0,8 - , .
= 0,6 - , .
Bcol = 6 - ;
k - , z
( 6 [ 4 ]). .
, 0,00, z .
|
|
|
2
| Z | 5 | 18 | 21,15 |
| k | 0,5 | 0,810 | 0,862 |
| qwa | 1,212 | 1,964 | 2,090 |
| qwp | 0,909 | 1,473 | 1,567 |
:
qwa,e=2M/H2=2388,22/18,62=2,244 /,
qwa
- .
,
() 
/
.
3.
| - | |||
| ) | |||
| 1. : | |||
| - | q | kH/ | 6,40 |
| - | G1g | kH | 115,20 |
| ) | |||
| 1. | |||
| - | qs | kH/ | 6,84 |
| - | FS | kH | 123,12 |
| 2. : | |||
| - | Dmax | kH | 551,28 |
| - | Dmin | kH | 281,12 |
| : | |||
| - | Mmax | kH | 275,64 |
| - | Mmin | kH | 140,56 |
| 3. | 20,08 | ||
| 4. : | |||
| - | qwa,e | k/ | 2,244 |
| - | qwp,e | kH/ | 1,683 |
| : | |||
| - | Wa | kH | 6,38 |
| - | Wp | kH | 4,73 |
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( ) II 4 200 ( II-23-81*). 180.
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(7,24+9,49) ≈ 15,95.
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| . | . | ||||||||||
| C | C | A | |||||||||
| M4, ͷ | N4, | M3, ͷ | N3, | M2, ͷ | N2, | M1, ͷ | N1, | Q, | |||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 1 | 1,0 | -96,26 | -115,20 | -62,37 | -115,20 | -32,49 | -115,20 | 71,43 | -115,20 | -7,4 | |
| 2 | 1,0 | -102,98 | -123,12 | -66,35 | -123,12 | -35,57 | -123,12 | 76,77 | -123,12 | -8,0 | |
| 0,9 | -92,69 | -110,81 | -59,71 | -110,81 | -32,01 | -110,81 | 69,10 | -110,81 | -7,2 | ||
| 3 | , | 1,0 | -4,12 | - | 75,72 | - | -199,92 | -551,28 | 47,52 | -551,28 | -17,7 |
| 0,9 | -3,71 | - | 68,15 | - | -179,93 | -496,15 | 42,77 | -496,15 | -15,9 | ||
| 4 | , | 1,0 | -31,10 | - | 25,30 | - | -73,82 | -198,24 | 91,42 | -198,24 | 11,8 |
| 0,9 | -27,99 | - | 22,77 | - | -66,44 | -178,42 | 82,28 | -178,42 | 10,6 | ||
| 5 | 1,0 | 15,48 | - | 28,22 | - | 28,22 | - | 73,18 | - | 7,2 | |
| 0,9 | 13,93 | - | 25,39 | - | 25,39 | - | 65,87 | - | 6,5 | ||
| 6 | 1,0 | 12,66 | - | 1,60 | - | 1,60 | - | 47,62 | - | 4,3 | |
| 0,9 | 11,39 | - | 1,44 | - | 1,44 | - | 42,85 | - | 3,9 | ||
| 7 | 1,0 | 135,81 | - | 30,65 | - | 30,65 | - | -371,60 | - | 48,1 | |
| 0,9 | 122,23 | - | 27,58 | - | 27,58 | - | -334,44 | - | 43,3 | ||
| 8 | 1,0 | -86,50 | - | -25,03 | - | -25,03 | - | 350,76 | - | -39,2 | |
| 0,9 | -77,85 | - | -22,52 | - | -22,52 | - | 315,68 | - | -35,2 |
4.
| . | ||||||||||
| C | C | A | ||||||||
| M4, ͷ | N4, | M3, ͷ | N3, | M2, ͷ | N2, | M1, ͷ | N1, | Q, | ||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| + Mmax + Ncor | 1,0 | 39,55 (1,7) | -115,20 | 41,57 (1,3,5) | -115,20 | -1,84 (1,7) | -115,20 | 422,19 (1,8) | -115,20 | -46,6 |
| 0,9 | 25,97 (1,7) | -115,20 | 58,75 (1,3,5,7) | -115,20 | -4,91 (1,7) | -115,20 | 604,36 (1,2,4,5,8) | -404,43 | -45,7 | |
| - Mmax | 1,0 | -199,24 (1,2) | -238,32 | -128,72 (1,2) | -238,32 | -260,63 (1,3,5) | -666,48 | -300,17 (1,7) | -115,20 | 40,7 |
| + Ncor | 0,9 | -284,44 (1,2,3,5,8) | -226,01 | -144,60 (1,2,8) | -226,01 | -292,34 (1,2,3,5,8) | -722,16 | -263,01 (1,7) | -115,20 | 35,9 |
| Nmax | 1,0 | 39,55 (1,7) | -115,20 | 41,57 (1,3,5) | -115,20 | -68,06 (1,2) | -238,32 | 192,13 (1,3,5) | -666,48 | -32,3 |
| + Mcor | 0,9 | -66,72 (1,2,7) | -226,01 | 58,75 (1,3,5,7) | -115,20 | -36,92 (1,2,7) | -226,01 | 564,85 (1,2,3,5,8) | -722,16 | -72,2 |
| Nmax | 1,0 | -199,24 (1,2) | -238,32 | -128,72 (1,2) | -238,32 | -260,63 (1,3,5) | -666,48 | 45,77 (1,3,-5) | -666,48 | -32,3 |
| - Mcor | 0,9 | -284,44 (1,2,3,5,8) | -226,01 | -122,08 (1,2) | -226,01 | -292,34 (1,2,3,5,8) | -722,16 | -286,11 (1,3,-5,7) | -611,35 | 13,5 |
| Nmin | 1,0 | 422,19 (1,8) | -115,20 | |||||||
| Mcor | ||||||||||
| Qmax | 0,9 | -72,2 (1,2,3,5,8) |
5.
|
|
|
4. .
4.1. .
( ).
- :
N = - 226,01 ; M = - 284,44 ;
-
N1 = - 404,43 ; 1 = 604,36 ( );
N2 = - 722,16 ; 2 =-292,34 ( );
: Qmax= - 72,2 ;
IB/IH=0,157; - 245(R=24 /2) t=2-20 .
- 12,5(Rb=9,5).
γn= 0,95.
-; - -082; .
4.2 lx.
, 
,
H/H=4,6/14,0=0,328<0,6, μ1 μ2 :
, μ1=1,77,( 
n), μ2= 
.
, :
- lefx1=1,77∙14,0=24,87 ;
- lefx2=3× 4,6=13,80 .
: ly1=H1=14,0 ;
ly2=HB-h..=4,6-0,75=3,85 .
4.3. .
h2=500 .
:
;
2,
;
:
;
;
;
. 27*[2]
.7.14* [2]:
:
tf = 10 , hw =h2 -2tf = 50-21,0=48,0 . :
: tw = 9 .
:
f= (r -hw×tw)/2=(79,56-48,0×0,9)/2=18,18 2
tf = 10 , 
- .
: bf = 19,5c.
tf bf: 
. 29*[1] :
:
| bf | 19,5 | |
| h2 | 50 | |
| tf | 1,0 | |
| hw | 48,0 | |
| tw | 0,9 |
:
o=48,0×0,9+2×19,5×1,0=82,20 2
4;
4;
3;
;
;
;
;
f / w=19,50/43,20=0,451
.
. 73[1] :
:
;
. 74[1] 
:
/2 
/2
(24-23,30)/24 = 2,91 % < 5 %
.
. 72[1] jy=0,547.
ͷ;
mx=Mx,1/3A/NWx=237,8210082,20/226,011268,17=6,82;
α5=0,65+0,05mx=0,65+0,055=0,9;
|
|
|
α10=0,65+0,05mx=0,65+0,0510=1,15;
5=1,04/(1+ αmx)=1/(1+0,95)=0,19;
10=1,04/(1+ αmx)=1/(1+1,1510)=0,083;
=5(2-0,2mx)+c10(0,2mx-1)=0,12+0,03=0,123;
β=√j/jy=√0,598/0,547=1,04
. 72[1] j=0,598.
/2 /2
. 7.16*[1]
σ=(-N)/A+(-M)/Wx=(-556)/149,2+(-528100)/2740,5=-22,99/2
σ1=(-N)/A+(-M)/Wx=(-556)/149,2-(-528100)/2740,5=15,54/2
α=σ- σ1/ σ=22,99-15,54/22,99=0,32< 0,5
.
