1
,/ 2 | , / 2 | ||
: |
0,0725,0=1,75 |
1,1 |
1,925 |
(h= 0,07, ρ =25,0 / 3); | |||
( ) | 1,00 | 1,2 | 1,2 |
2,75 | g =3,125 | ||
( ) | 10,00 | 1,2 | v =12,00 |
12,75 | 15,125 |
. 2. :
; ; ;
- 1 : q = (g +v)γ n = 15,1251=15,125/.
( 2 =1)
(.2, ):
:
02 |
/16= 15,125×1,82/16= 3,06ͷ;
:
01 |
/11= 14,37×1,712/11= 4,02
ͷ.
h / l 02 = 70/1800≈1/26>1/30,,,20%,..0,83,06=2,45ͷ.
.I[3].
,,25:
R b = 14,5; R bt = 1,05.
500.IV.1 α R = 0,376.
.
,,-:
h 0 =h a= 7022=48;
α m = M /( b )=2,45106/(14,51000482)=0,0733< α R = 0,376.
1:
R s A s = R b bh 0(1-
1- 2α m)= 14,5×1000× 48(1-
1- 2× 0,0733)
=53038H;
.III135:c R sA s = 53360H>50331H.
:
4 B 500- 1002940
3 B 500- 200
h 0 = h a = 7025=45(=25-); α m =4,02106/(14,51000452)= 0,137< α R = 0,376;:
R s A s = R b bh 0(1-
1- 2α m)= 14,5×1000× 45(1-
1- 2× 0,130)= 96533.
9653353360=43173;237:
5 B 500- (´200)+ 1002940
RA
= 44270>37838H.
3 B 500- 200 ss
1.3..
, (.3, ):
l 01 = l c /2 b /2 = 6000250/2 300/2= 5725 = 5,725.
. 3. :
|
|
;
1, -,-2,0(.. 1).
:
(.)3,1252,0=6,25/;
0,2(0,40,07)251,1=1,815/.
: g =6,25+1,815=8,065/.
: v = 12,02,0=24,0/.
(γ n = 0,95II):
q = (g + v)γ n = (8,065+24,0)0,95= 30,46/.
,(.3, ),:
:
01 |
/11= 30,46× 5,7252/11= 90,76
ͷ;
:
01 |
(): Q = 0,6 ql 01=0,630,465,725=104,6.
:
h 0 +a = 292+45=337<400,...
400(R s = 350)..IV.1.IV α R = 0,391.
,,.
(.4, ) =90,76ͷ.
. 4. :
;
.3.26[5]:
' |
70/400=0,175>0,121/6 l 01 +b = 21/65725+200=2108>2000
f |
h 0 = h a = 40035=365.
Rb ' h '(h
- 0,5 h ')= 14,5200070(3650,570)=669,9106ͷ=669,9
bf f 0 f
>90,76ͷ, ,-
b = b '=2000. α m =
f |
= M / (R b bh 0)=90,7610
/(14,52000 365)=0,0235< α R = 0,391;
:
2
A s = R b bh 0(1-
1- 2 α m)/ R s = 14,5× 2000× 365(1-
1- 2× 0,0235)/350
=719.
:2Ø22A400(A s = 7602).
(.4, ), = 71,31ͷ.: h 0 = h a =
6 2
= 400−45=355; α m = M / (R b bh 0)=71,3110
/ (14,5 200 355)= 0,195<
< α R = 0,391;-
2
:
A s = R b b h 0(1-
1- 2 α m)/ R s = 14,5× 200× 355(1-
1- 2× 0,195)/350=644.
4Ø16A400(A s = 8042).(--53Ø14+2Ø16- A s = 462+402=8642>6442).
(.5).
|
|
. 5. :
;
.II.4..II Ø6B500(R sw =300, 2(A sw =572). -.5.21[5]:
s w = 180< h 0 / 2=365/2=182,5.
: Q max = 104,6,-
: q 1 = q = 30,46/.
(3.43)[5]:0,3 R bbh 0 = 0,314,5200365=317550H=317,55> Q max =104,6,
...
(3.48)[5]
q sw = R sw A sw / s w =30057/180=95,0/(/).
q sw R bt b
= 95,0
1,05× 200
= 0,452>0,25,.. (3.49)[5],
M b (3.46)[7]:
M b = 1,5 R bt
bh 2= 1,51,052003652=41,97106ͷ=41,97ͷ.
0 |
.
q sw R bt b
= 0,452 < 2,0, c :
c = M b / q 1=
41,97/30,46= 1,174
; = 1,174>3 h 0 =30,365=1,095,-
= 1,095.
.3.31[5], 0. c 0 =c = 1,095>2 h 0 = 20,365=0,730, c 0 = 0,730.
Q sw = 0,75 q sw c 0 = 0,7595,00,730=52,01; Q b = M b / c = 41,97/1,095=
=38,33; Q = Q max q 1 c =104,630,461,095=71,24.
(3,34)[5]: Q b + Q sw =38,33+52,01 =90,34> Q =71,24,....3.35[5],:
s max =
2
R bh / Q |
= 1,052003652
/(104,6103)=267> s w =180.
,. --..6.
.7., -, ,--.-.2 3.
.89-.
========================================================================================================================
411.IK b.h()b.h()h.L()qHq.-d.sw1K.I ..IH/C1 C2 H/S1(n.)S(n.)sw1 IC I::::::::::: I1180210I102.01 20.4030.757.20014.37 35 37 30.462.224.166.180289.75 I
=====================I---------------------------------------------------------------------------------------------------------------------------------------------- I
:
b.h -,;
b.h -,;
h.L -,;
q -1,/;
1 8478-81;,(,34.2,34);
2 2;
|
|
q ,,/;
S1(n.)-()(,2202.20);
S(n.),;
d.sw1- ;
sw1
. ,
.
.6.
========================================================================================================================
411.IKb.h()b.h()h.L()qH q.-d.sw1PI ..IH/C1 C2H/S1(n.) S(n.)sw1I I102.0120.40 30.75 7.200 14.370 35.0 37.0 30.46 2.22 4.16 6.180 I
I 20.40 30.75 7.200 14.370 35.0 37.0 30.46 2.22 4.16 6.180 I
------------------------------------------------------------------------------------------------------------------------
BOTHO,:
M ࠠ ( ) B
C1- 1. | C2-1. | C3-2. | S1 | S | S2 | S | S2' | |
4B500-1OO | 5500-(X2OO)+1OO | 5B500-(X2OO)+1OO | (n.) | 2.22 | 4.16 | 2.18 | 4.14 | 2.12 |
-----------294O | -----------------294O | -----------------294O | dsw1 | sw1 | dsw2 | sw2 | sw3 | |
3B500-2OO | 3B500-2OO | 3B500-2OO | () | 6. | 180. | 5. | 180. | 300. |
|
C14.0
-474.5
Yf=1 | Mmax | 362.6 | 430.4 | 203.6 | -123.2 | 150.6 | 324.5 | 203.6 | -4.3 | |||
(G=50.45;PL= | 96.90) | Mmin | 71.9 | 42.8 | -87.1 | -512.5 | -140.0 | -63.1 | -87.1 | -419.6 |
Yf>1 | Mmax | 479.8 | 572.8 | 278.9 | -127.1 | 211.9 | 438.8 | 278.9 | 25.2 | |
(G=56.63 | ;P=136.80) | Mmin | 69.4 | 25.6 | -131.5 | -676.7 | -198.5 | -108.4 | -131.5 | -561.1 |
T, ..,B.
.7. .
.8.
.9. :
;
1.4.
. .(), .380.
,,. , ,.
|
|
-(). -,- γ f =1() γ f >1().
-.,.
.0,4, 0,3.-30%,, γ f =1..
-,.-.
- . -,-(..18).
,().
-.
-,.
. 380,:
l 1= l 4=8,00−0,25+0,50,38=7,94; l 2= l 3=8,00.
,() .10.
. 10.:
; ...
,(..7).
-:
=515ͷ;(676,7515)/676,7100=23,9%| | =515ͷ>| | =512,5ͷ( γ f =1);
-
=515ͷ(.11, );
-G=56,63(.11, );
-G=56,63=136,80(.11, );
.11, 11, min, . 11, 11, max(.11, ).
.
:
Q,max= (515190,6)/2,0=352,8;Q,min=(515+216,7)/2,0=149,2.
Q .11, .
-. ,(),.: b × h = 400×400.
|
|
, -:
= +0,5 Q,min h = 515 +0,5149,10,4 = 485,2ͷ., h .
. 11. :
; ; ; ; Q
,, 25(R b = 14,5; R bt = 1,05).400(R s = 350, ξ R =0,533 α R = 0,391).