2.1 d:
2.2 d d max, , d > d max; d < d max, .
2.3 N:
.
2.4
1.2.5 f c min N, f c max N , N
| ̳ N | 
|
| N | 
|
| N | 
|
3.
3.
| ϳ | ̳ N | N | N |
| N |
- ,
, .
2.1
2.1.1 nc=3 Qn, = 2 (1,25 ) 
=700.
Qb, S=2500 f.
, , Q :
f max N = f max N + 2f;
f min N =f min N + 2f.
Q = 150 .
Qmax N = Q N*1,1 .
:
Δf (Δf = 500 ).
|
|
|
:
Lt; ճ
1. 0
f c min 53
f c max 62
- 2 max = 1,05.
- .
- :
> max (1,17>1,05) .
- N
.
. , 4 N=4.
- f c min N, f c max N , N
2. , ;
3 ,
