- 1
:
0
..
_____________ ______________
201
1 . 3
2 . 5
3 . 7
4 . 8
5 .. 9
6 . 11
. 15
, . 1 .
1-
(B x D),2 | h1 | - | |||
IV | I | 12x18 | 2,0 | 0,3 |
.
1.1 . .1 , III III .
III = 1,5%
1.2 ,(%)
= eIII mc,
m- - , .2 ; c- . I, II, III c=1, IV c=0,9.
m = 1,2, c=1, III = 1,5 => = 1,5*1,2*1 = 1
1.3 B h1 D B. . .3 .
D/B=18/12=1.5
=> 19
B/h1=12/2.0=6
1.4 ..4 r, . . . , . 1 , .
= 2,6
D/B=18/12=1.5 => 19
B/h1=12/2.0=6
1.5 , . . . , (2)
S0=(e 0Sk)/(100 0 r)
- . . ., %; 0- ; S- , 2; k- , , k =1; 0- , 0 =0,38; r-, .
S0=(1,8*19*12*18*1)/(100*0,38*2,6) = 74,77
74,77/6=75
1.6 :
|
|
, , .
2 -
(B x D), 2 | , | - | - | ||||
I | 12x18 | 70,50 |
2.1 , ( ), , E . .5 .
1500.
2.2 i
i=S/(H (D+B));
S- , 2; H , H=2,5 ; D , ; B , .
i = 12*18/2.5*(12+18) = 2,88
2.3 , ..6 .
0,67
2.4 . .8 .
= 18600
2.5 n, ,
n=(ESkz)/( ),
E , ; S , 2; k , , , ( k=1,8); z- , ( z=1,1); , ; - .
n = (1500*12*18*1.8*1.1)/18600*0.67=52
2.6 :