L=6, . 1
= 1* L/2=1*5,8/2=2,9 2 .
( ):
g1n= 8557 /2 ,
g1 = 9426 /2 ;
() pn1cd = 300/2, pn1ld = 700 /2 ;
p1cd = 390 /2
p1ld = 910 /2 .
( ):
g2n= 3606 /2 ,
g2= 3976 /2;
- pn2ld = 1400 /2 ,
pn2d = 600 /2 ,
p2ld = 1820 /2
p2d = 780 /2 .
:
640 - 20 (640+20+20)=680 = 0,68
1. :
N1n= N1+N2= 10,8+13,6=24,4 /.
2. : 0,0 6,36
N2n = h*ρ*H*(1-k0) = 0,68*18000*6,36* 0,32= 24910/
, k0 :
k0 = 0w / w = 2,16*5,14/ (2,7*6) =11,1/16,2 =0,68
0w - :
0w=h*=(2,7-0,9+0,36)*(6,0-0,86)=2,16*5,14 (²)
w - :
w= h*L=2,7*6,0 (²)
3. ℓ =1, 500 /2 ,
N3n = ℓ*H *k0 *500 = 1*6,36*0,68*500 = 2162 /;
4.
N4n = hHρ = 0,6*2,7*24000 = 38880 /,
ρ- / 3
h- ( 24. 6. 6).
5. 1 :
Nn = (q1n+q2nnp+p1n+p2np)A+ N1n+N2n+N3n+N4n= =(8,557+3,606*1+0,64+1,87*1) *2,9+24,4+24,910+2,162+38,880=132,9 /,
np = 1 - :
p1n = pncd φ2 + p1cd φ1 = 0,3*0,9+ 0,39*0,95=0,64 /2 ;
p 2n = p n 2d φ2 + p n 2ld φ1 = 0,6*0,9+1,4*0,95= 1,87 /2 ;
φ1 = 0,95 - φ2 = 0,9 , ( n.112. ).
6.
N=(9,426+3,976*1+1,21+2,43*1)*2,9+24,4*1,1+24,910*1,1+2,162*1,1+38,88*1,1=145,3 /
p1 = 390*0,9+910*0,95=1215,5 /2 = 1,21 /2 ;
p2 = 780*0,9+1820*0,95 = 2431 /2 = 2,43 /2 ;
. R0 = 0,25 .
-L=1, b γn = 0,95
b = Nn * γn / (100*(R0 - γmf*d)) = 132900*0,95/(100*(25-0,02*270))= 64,41,
R0 =25 /2 ;
γmf = 20 /3 = 0,02 /3 ;
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d=2,7=270
b=100 , 200 ,
.
N = 160,7 /; , :
= *²/2=138*0,2²/2 =2,765/,
, = (b-0,6)/2=(1 -0,6)/2=0,2=200
= N γn / (L*b) = 145,3*0,95 / (1*1) =138/²= 0,138<Ro=0,25
h = */(φb2*Rbt* γb2* L)= 0,2(100) *2300/ (0,6*0,85*(100) *0,9*100)= 18400/ 3780 = 10,02 ,
p= 2300/² ;φb2 =0,6 ( . =0,6). Rbt = 0,85, h =10 h0 =10-3,5=6,5 . 10 II
As= M/ (0,9 h0 Rs) = 2,76*105 / (0,9*6,5*280*100) = 1,822 .
200 , 1 4 Ø 10 II, As=3,142.
μ= (As / L*h0 )*100 = 3,14*100/ 100*6,5 = 0,48% > μ min = 0,1%.
.
.
bc * hc = 400 * 400 .
- Ɩ0 = Hf = 2,7 , , Ɩ0 = 0,7 1 =0,7 *2,7 = 1,89 .
:
2- :
Gc2 = bc * hc *Hf * ρ * γf = 0,4*0,4*2,7*25*1,1 = 11,8 .
1- :
Gc1 = bc * hc(Hf + b) ρ * γf = 0,4*0,4(2,7+1,89)25*1,1 =20,2 .
2- = 11,8+20,2= 32 .
4040 . - B15, Rb = 8,5 , Rbt = 0,75 ,
γb2 =0,9. - A-III Rs = 280 ; - -1.
:
1) N1 = Gc1 =20,2 , 1 = 577 *, = /N = 28,6 ;
2) N2 = Gc2 =11,8 , 2 = 210 *, = /N = 17,8 ;
Nn = Nl/γfm = 787/1,15 = 684 , γfm = 1,15 - .
:
1 = 0,125*Rs (a - hc)2 *b= 0,125 * 280*100 (150 - 40) *150 = 577 *.
2 = 0,125*Rs (a - a1)2 *b = 0,125 * 280*100 (150 - 110) *150 = 210 *.
- R0 = 0,3 . 2,86; - γmt = 20 /3.
Af cal = Nn/(R0 - γmt*H1) = 684000/(0,3*106 - (20*2,86)*103)= 2,8 2.
=√ Af cal = √2,8 = 1,67. = 1,5 ( 0,3 ).
ρ`s = N/A = 787/1,5*1,5 = 350 /2 = 35/2;
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h0 = (0,4 + 0,4) /4+0,5 √684/0,9*0,75*103+350 = 0,61.
: = 61+4 = 65 ;
= 1,5hcal +25 = 1,5*40+25= 85 ; Ø 28 -III 20.
= 30d +25 = 30 * 2,8 + 25 = 109 .
110 , h0 = 110 - 4 =106 ; 30 ; 20+5=25; 35 , - 40 .
h01 = 30-4 = 26 :
h01 = 35 > 0,5( - hc - 2h0) ρ`s/ (k1*γb2*Rbt) = 0,5 (300-30-2*106) * 35/(0,6 * 0,9 * 0,75*102) = 25,06
.