1. ,
.
3.
n =5;
:
=> : l '= l =5200.
2.
n =4;
.=> : l = 4700,
: l '= 
.
l 2, l 1.
:
l '1=4650; l 1=4700; l '2= l 2 =5200.
3.
hf = l max/30 = 5200/30 = 173 . hf = 170.
4.
hf = 
l2 = 
≈400.
= 
h = 0,4500=200.
:
- hf = 200.
- h = 400.
- = 200.
1. 1 ²
| g f | |||
| /: r = 2500/³, hf = 170 | 1,1 | ||
| / : r = 2200/³, t = 20 | 1,3 | ||
| : r = 1800/³, t = 13 | 1,1 | ||
| , g = 5504 | |||
| 1,2 | |||
| , υ = 7080 |
2. : g n = 0,95
- : g 0,95 = 55040,95 = 5229 /²
- : υ 0,95 = 70800,95 = 6726 /²
: q = g + υ =11955 /².
3.
- :
l 1 = l1 - = 4700-200=4500;
- :
l 2 = l2 - = 5200-200=5000, = 200.
:
< 2 => .
4. :
,
;
:
; 
; 
;
2 = 0,9 1; I = 1,5 1; II = 1,5 2 =0,91,5 1 =1,35 1.
= 
;
;
, = 1:
=(
;
=0,9 
=0,94,683 = 4,215ͷ;
ͷ;
5. :
-
ξ= 0,15, α m= ξ (1-0,5 ξ)=0,15(1-0,50,15)=0,139.
- :
ho = 
- :
hf,crc = 
:
- hf = 140 ;
- ho = h-= 140-25 = 115, =25.
|
|
|
- ( f = 1000)
:
;
ζ= 0,5(1+ 
;
;
5Æ5 500 =98 ²;
(99,82 98)100%/98 = 1,86% < 5%, , .
S= 
;
;
:
;
5Æ5 500 =98 ²;
S = 
;
-
:
;
6Æ6 500 =170 ²;
S = 
;
S = 170 ,
> 159,1 2
:
;
5Æ6 500 =142 ²;
S = 200 . 
