( 500500), 640, , 200.
1 = / =6,4/3=2,13
1 = / = 6,4/4=1,6 ,
=6,4
= 3÷4
, 2,7 ÷ 1,7 → 2,13 , .
h = 1/20 ÷ 1/45 = 2130/20 ÷ 2130/45 =106,65 ÷ 47,4
h = 70
h1 = l1/12 ÷ l1/15 = 5600/12 ÷5600/15 = 466,66 ÷ 373,33
l 1
( 5 ) h 2= 400
b. = h./2 ÷ h./3= 400/2 ÷ 400/3 = 200 ÷ 133
b. = 200
: 400(h) × 200 (b)
h1 = la/8 ÷ la/12 = 6400/8 ÷ 6400/12 = 800 ÷ 533
la 6400
h1 = 700
b1 = h1/2 ÷ h1/3 = 700/2 ÷ 700/3 = 350 ÷ 233
b1 = 250
.
. 
1.
2. -
3.
4.
5.
: R bt = 0.75 ().
: g b2 = 0.9, E b = 2310-3 (M).
: R b = 8,5 ().
l01 = l - b./2 +/2 = 2130 200/2 200 + 120/2 = 1890
l02 = l - b. = 2130 - 200 = 1930
1 Q
| / | (h, p ) | /2 | ˠf | /2 |
| : h =20 , = 16 /3 | 0,02 ×16 = 0,32 | 1,2 | 0,384 | |
| - : h = 30 , = 18 /3 | 0,03 × 18 = 0,54 | 1,3 | 0,702 | |
| : h = 100 , = 6 /3 | 0,1× 6 = 0,6 | 1,3 | 0,78 | |
| 0,05 | 1,2 | 0,06 | ||
| : h = 70 , = 25 /3 | 1,75 | 1,1 | 1,925 | |
| 0,5 | 1,2 | 0,6 | ||
| 4,451 |
V
V = G ×γf = 8 × 1,2 = 9,6 /2
q = (V+Q) ×1 = (9,6 + 4,451)×1 = 14,051
1 = - b = 
= 
=4,54
2 = - = 
= 
= 3,25
|
|
|
15:
Rb = 8.5
Rs = 355 III, Ø 6÷8
375 BpI Ø3
365 BpI Ø4
360 BpI Ø5
1)
( ).
, h0 , .
= .
2) :
H0 = 
= 
= 0.045 = 4.5 c
Hmp = h0 + a = 4,5 + 1,5 = 6,00
6 , 1.5 , 7 ( 1 ).
3)
III 
R s = 355 (). , 4- .
αm = 
= 
= 0,141
38, αm = 0.141 ξ = 0,154 ζ = 0,923
:
As = 
= 
= 1.803 2
As = 1.803 ≤ 1.96
3 
, 1.96 2/
Amp =1.96 2/
4)
αm = 
= 
= 0.196
38, αm =0,196 ξ = 0,22 ζ = 0,89
:
As = 
= 
=0,000261 = 2,61 2
= 2,61 1,96 = 0,65 2
0,65 2
