-
Ȼ
: .. : 270102 : 270102-070157-10 : 44 : ..
: :
2010
1. .3
1.1. .3
1.2. .4
1.3. .6
2. .9
3. .13
4. .16
5.
.21
.24
1
, 5,7
, 6,8
, \2 4,0
, \2 1,1
15
-III
50%
II
, .. . 250 , 120 . . 20%. .
.1.
:
-
h = (1\12 ¸ 1\20) l = 1\155700 400, b = (0,3 ¸ 0,5) h = 0,5400 = 200 ;
-
h = (1\8 ¸ 1\15) l = 1\106800 700 , b = 350 ;
- 80 2300 .
.1. .
I.2.
. .1 2 :
|
|
l 01 = l b \2 c + a\2 = 2300 200/2 250 + 120/2 = 2010 ;
l 02 = l b = 2300 200 = 2100 ;
l 0 = l b =5700 350=5650 ;
5650/2200 = 2,57 > 2 - .
. 2. :
- ; - ; - ; - .
1 (.1) , . 1 1 2 . . 1.
/2 | g f | /2 | |
: - | |||
h =0,08 (r=25/3) | 0,0825=2,00 | 1,1 | 2,2 |
- | 1,1 | 1,2 | 1,32 |
: | 3,1 | - | q = 3,52 |
4,0 | 1,2 | v =4,8 | |
: | 7,1 | 8,32 |
(g n =0,95) 1 q = (g + v)g n = 8,320,95=7,9 /.
:
= q l 202/16 = 7,9 2,12/16 = 2,177 [ͷ];
= q l 201/11 = 7,9 1,7102/11 = 2,9 [ͷ].
h / l 02 = 80/2100 = 1/28 > 1/30, , , 20%, .. 2,1770,8=1,74 [ͷ].
[2] [3] .
-, , 15, 50%:
g b 2 = 0,9; Rb = 8,50,9 = 7,65 []; Rbt = 0,750,9 =0,675 []; Eb = 23000 [].
.
.
h 0 = h - a =80 12,5 = 67,5 ,
a m = /(Rb b h 20) = 1,74106/(7,65100067,52) = 0,049
[I, 2] : x = 0,05 < x R = 0,654; z=0,975
RsAs = M /(z h 0) = 1,74106/(0,97567,5) = 26438,75 ;
[7] 1 47
RsAs = 36800 > 32586 .
h 0 = h - a = 80 16,5 = 63,5 ;
a m = 2,96106/(13,05100063,52) = 0,056
x = 0,0578 < x R= 0,597; z = 0,971;
RSAS = 2,96103/(0,97163,5) = 48006 ;
. . 1, 48006 36800= 11206 .
2 31
RsAs = 18110 > 11206
I.3
.3. . 6 -I, -I.
|
|
.
() , (.3)
l 01 = l - c /2 - b /2 = 5900 - 250/2 - 250/2 = 5650 = 5,65.
1 . , .
:
- 3,42,4=8,16 /
- (0,4 - 0,08)0,2251,1=1,76 /
g = 9,92 /
: v = 6,02,4=14,4 /
q = (g+v) gn = (9,92 + 14,4) 0,95 = 23,104 /.
- = ql201/11 = 23,1045,652/11 = 67,05 ͷ;
- = ql201/14 = 23,1045,652/14 = 52,68 ͷ.
.3
- ; - .
( )
Q = 0,6 q l 01 = 0,623,1045,65=78,32 .
-I (RS =225 ).
:
h = h 0 + a = 265 + 35 = 300 < 400 , .. .