σ [14]:
σ lim b , [14]:
σ lim b = 2 + 70;
σ lim b 1 = 2 HB 1 + 70 = 2 310 + 70 = 690 ;
σ lim b 2 = 2 HB 2 + 70 = 2 290 + 70 = 650 ;
SH , SH = 1,1 [14];
ZN :
NH lim , ,
NH lim1 = 30 ( )2,4;
NK , ,
NK = 60 n Lh,
=1 , ;
Lh , 10 000 (. );
n ;
m , : m = 20, NH lim < NK, m = 6, NH lim ≥ NK.
NH lim ≥ NK, 2,6 1,8 , NH lim < NK 0,75 [14].
NH lim1 = 30 (HB 1)2,4 = 30 (310)2,4 = 2,86 107 ;
NH lim1 = 30 (HB 2)2,4 = 30 (290)2,4 = 2,437 107 .
:
NK 1 = 60 n 1 Lh = 60 1 ∙ 949 ∙ 10000 = 56,94 107 ;
N 2 = 60 n 2 Lh = 60 1 ∙ 301,27 10000 = 18,08 107 .
NH lim1 < NK 1 NH lim2 < NK 2,
σ 2 = 481,3 .
σ FP [14]:
σ F lim b , [14]:
σ lim b = 1,75 HB;
σ lim b 1 = 1,75 HB 1 = 1,75 310 = 542,5 ;
σ lim b 2 = 1,75 HB 2 = 1,75 290 = 507,5 ;
SF , SF = 1,41,7 [14], , ;
YA , , ( ) YA = 1 [14], YA = 0,70,8;
YR , ; YR =
= 1,2; YR = 1,0;
YN ( 1) [14]:
NF lim ; NF lim = 4 106 [14];
|
|
NK [14]:
NK = 60 n Lh;
NK 1 = 60 n 1 Lh = 60 1 949 10000 = 569,4 106 ;
NK 2 = 60 n 2 Lh = 60 1 301,27 10000 = 180,8 106 ;
qF ; , , qF = 6; qF = 9 HB > 350 [6, . 343].
NF lim < NK 1, NF lim < NK 2, YN 1 = YN 2 = 1.
σ FP 1 = 542,5 1 1 1 / 1,7 = 319,12 ;
σ FP 2 = 507,5 1 1 1 / 1,7 = 298,53 .