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1 (. . 1). , (. 2). 1 12 . 1.
1
1 2
, /2 | , /2 | ||
: (h= 0,07, ρ =25,0 /3); | 0,0725,0 = 1,75 1,00 | 1,1 1,2 | 1,925 1,2 |
2,75 | g = 3,125 | ||
5,0 | 1,2 | v = 6,0 | |
7,75 | 9,125 |
. 2. .
1 q = (g + v) γ n = (3,125+6,0)1,0 = 9,125 /; γ n =1,0
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∙;
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ͷ.
h / l 02 = 70/1900 ≈ 1/28 > 1/30, , , 20%, .. 0,8 2,06 = 1,65 ͷ.
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, , 20:
Rb = 11,5 ; Rbt = 0,9 ;
500 αR = 0,376.
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, , :
h 0 =h a= 70 22 = 48 ;
αm = =1,65106 /(11,51000482)=0,062< αR= 0,376.
1 :
RsAs = = 35356 H;
1 33 : c RsAs = 35580 H > 35356 H.
:
h0 = h a = 70 25 = 45 (=25 ); αm = 2,72106 /(11,51000452)= 0,1168 < αR = 0,376; :
64458 .
, 64458 35580 = 28878 ; 2 32 :
RsAs = 30070 > 28878 H.
. , (. 3, ):
l 01 = l c/2 b/2 = 5600 250/2 300/2 = 5325 = 5,325 .
. 3. : ; |
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1 , , 2,1 (. .1).
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3,1252,1=6,56 /;
0,2 (0,4 0,07) 251,1 = 1,815 /.
: g = 6,56+1,815=8,375 /.
: v = 6,02,1 = 12,6 /.
(γ n =1,0)
q= (g + v) γ n = (8,375 + 12,6) 1,0 = 20,975 /.
, (. 3, ), :
:
=54,07 ͷ;
:
= 42,48 ͷ.
: Q = 0,6 ql 01= 0,620,9755,325 = 67 .
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h 0 +a= 253+45=298 <400, .. .
400 (Rs= 350; αR= 0,390)
, , .
(. 4, ) = 54,27 ͷ.
:
70/400 = 0,175 > 0,1 21/6 l 01 + b= 21/65325+200 = 1975 < 2100 ( ) = 1975 .
h 0 = h a = 400 35 = 365 .
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. 4. : ; |
11,5197570 (365 0,570) = 525,7 106 ͷ = 525,7 > 54,07 , , = 1975 . αm= M / (Rbbh 02) = 54,07 106 / (11,5 1975 3652) = 0,0179 < αR= 0,390; :
As = =422 2.
2Ø18 A400 (As= 509 2).
(. 4, ), = 42,48 ͷ.
h 0 = h a = = 400−45=355 ;
αm= M / (Rbbh 0 2) = 42,48 106 / (11,5 200 3552) = 0,147<< αR= 0,391; : = 368 2.
4Ø12A400 (As= 453 2). ( 5 3Ø10 + 2Ø12 As= 236 + 226 = 462 2 > 368 2).
. (. 5).
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. 5. : ; |
Ø5 B500 (Rsw =300, 2 (Asw =40 2).
:
sw = 180 < h 0 / 2 =365/2=182,5 .
Qmax= 67 , q1 = q = 20,975 /.
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0,3 Rb bh 0 = 0,311,5200365 = 215850 H = 215,85 > Qmax = 67 , .. .
qsw=RswAsw /sw = 30040/180 = 67/ (/).
0,372 > 0,25, .. , Mb :
1,50,92003652=35,97106ͷ=35,97 ͷ.
. 0,372 < 2,0 c ; = 1,31 >3 h0 =30,365=1,095 , = 1,095 .
0:
c 0 =c= 1,095 > 2 h0= 20,365=0,730 , c 0 = 0,730 .
Qsw = 0,75 qswc 0 = 0,7567,00,730= 36,7 ;
Qb=Mb / c= 35,97/1,095 = 32,85 ;
Q = Qmax q1 c =67,14 20,9751,095 = 44 .
Qb + Qsw = 32,85 + 36,7 = 69,55 > Q = 44 , . . .
smax= 0,92003652 / (67103) = 358 > sw = 180 .
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380 , :
l 1 = l 3 = 6,30 − 0,25 + 0,50,38 = 6,24 ;
:
= 180 ͷ; (248,5 180)/248,5100 = 27,57 % | | = 180 ͷ > | | = 177,5 ͷ ( γf = 1);
= 180 ͷ (. 6, );
G = 58,7 (. 6, );
G + = 129,26 (. 6, );
6, 6, min, 6, 6, max (. 6, ).
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Q 6, .
b × h = 400×400
.6. :
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Q
, , 20 (Rb = 11,5 ; Rbt = 0,9 ). 400 (Rs= 355 , ξR =0,531 αR= 0,390).
, .
(. 7, ), = 207,5 ͷ.
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. 7. : ; |
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bf = b + 2 1/6 l 01 = 0,3 +2 1/6 6,24 = 2,38 = 2380 .
h 0 = h a = 750 75 = 675 , a= 75 Ø25 Ø32 .
Rb bf hf (h0 0,5 hf)= 11,5238070 (675 0,570) = 1226,2106 ͷ= =1226,2 > M = 268,8 ͷ, b =bf = 2380 . :
207,5106 / (11,523806752)= 0,01664 < αR= 0,390.
:
873,4 2.
2Ø16 A400+2Ø18A400 (As= 402+509 = 911 2).
(. 7, ), = 180 ͷ.
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h 0 =h a= = 750 75 = 675 .
αm= 180106 / (11,53006752) = 0,1145 < αR= 0,390. :
799,9 2.
2Ø14A400 + 2Ø18A400 (As= 308+509=817 2).
2Ø12A400 (As= 226 2).
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. Q = Q ,max= 156,1 .
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. 8. : ; |
, = 1900 . α = = /h 0 = 1900/721 = 2,635 <3; α 0 = α = 635 > 2, α 0=2.
ε ε :
ε= 0,8< ε= 0.944, :
/.
Æ5 500 (Rsw =300 ); 4 (. .8,) Asw = 78,5 2; :
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0,5 h 0 =0,5721 = 360,5 300 .
:
sw.max = Rbt bh 02 / Qmax = 0,93007212 / (156,1103) = 899 .
sw= 295 , qsw = Rsw Asw / sw = 300 78,5 / 295 = 79,83 / > 79,65 /.
:
0,3 Rbbh 0 = 0,311,5300721 = 746,2103 H = 746,2 > Qmax= 156,1 ,
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2Æ18A400 (. 9, ),
As = 509 2; b = bf x = Rs As / (Rb b) = 355509 /(11,52380) = 6,6 < hf= =70 ,
Mult = Rs As (h 0 0,5 x) = 355509 (723 0,56,6) =
130106 ͷ = 130 ͷ.
2Æ18A400+2Æ16A400 (. 9, ), a= (509·29 + 402·99) / (509 + 402) = 59,9 ; h 0 = h a = = 750 60 = =690 ;
As = 911 2; x = 355911 / (11,52380) = 11,82 < hf= 70 ,
Mult = 355911 (690 0,511,82) = 221,2106 ͷ = 221,2 ͷ.
2Æ12 A400 (. 9, ), As = 226 2;
x = 355226 / (11,5300) =23,3 ,
Mult = 355 226(721 0,523,3) = 56,9 106 ͷ = 56,9 ͷ.
2Æ18A400 (. 9, ),
As =509 2; x = 355509 / (11,5300) = 52,4 ,
ult =355509(721 0,552,4) = 125,5106 ͷ = 125,5 ͷ.
. 9. Q ; ... |
2Æ18 A400+2Æ14400 (. 9, ), a= (509·29 + 308·99) / (509 +308) = 55,4 ;
h 0 = 750-55,4=694,6;
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As =509+308=8172;
x= 355817/(11,5300)=84,1 ,
ξ=x/h 0= =84,1/694,6 = 0,121 < ξR = 0,531, ult =355817(694,6 0,584,1) = =189,3106 ͷ = 189,3 ͷ.
:
Æ16 Q = 101,7 qsw= 79,83 /; Q/ (2 qsw)=101,7103/(279,83)= 637< h 0=723 , :
w = Q / (2 qsw) + 5 d = 101,7103 / (279,83) + 516 = 717 >15d=240 .
Æ14 Q = 86,2 w =86,2103 / (279,83) + 514 = 610 > 15d=210 .
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. 10. |
αm = 0,147, , , :
hs = h 0 h + 0,5 x = 690 400 +0,556,7 = 318,4
a = 2 hs+b= 2318,4 + 200 = 836,8 .
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F = G + P = 129,26
∑ Asw= F (1 hs / h0) / Rsw = 129,26103 ×(1 318,4 / 690) / 285 = 244 2, Rsw = 285 A400.
5Ø6A400 , 10Ø6A400 (∑ Asw = 283 2 ).
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