() , , , :
, (11)
- (. 6);
mn - , mn = 0,9 ( )
(12)
(13)
S= × × × , S= × × × , - , 2; Sn - , 2; t - t = 0,5; h- (. 7); h- , (. 8); r1 , , (r1 = 1,5-3,0); r2 , ( r2= 1,5; r2 = 1,35; r2 =1,15); , ( = 1,4); - (=1,3); - , (= 1,2-1,4).
(14)
- ; - .
³ . , - .
:
- 6 IV : .
2. : S= × × × =82×3×2×2=9842
: Sn=82×36=2952 2
3. =/2=36/2=18 , /h1=18/4=4.5; Ln/B=82/18=4.5
4. 7: /h1 Ln/B h0= 9.5
5. (12) ,
=1.45%
6. : S= × × × =
82×2×2×2=492 2; : Sn=82×36=2952 2
7. r2=1.35
8. h 8. 82/36=2.3
h=5.1
9. : (13) :
=1.63%
10. :
= 1.45+ 1.63 = 3.05% < 3.6%
: ³ . - .
7