7.77 ,
Q ≤ 0,3 φw 1 φb 1 Rb bh 0. | (7.58) |
(7.58):
Q - h 0 ;
φ w 1 = 1 + η n 1μ w, φw 1 ≤ 1,3,
η = 5 - , ;
η = 10 - , 45;
n 1 - , 7.48;
(7.59) |
Asw - , ;
Sw - ;
b - ();
h 0 - .
φb 1
φb 1 = 1 - 0,01 Rb, | (7.60) |
Rb .
7.78 ( 7.6) :
(7.61) |
. | (7.62) |
- ; -
7.6 - , ,
(7.61) (7.62):
Q - , ;
Σ RswAsi sinα, Σ RswAsw - ( ) , 2 h 0;
Σ RpwApi sinα, Σ RpwApw - , , ( , Rpw σpw 1 );
Rsw, Rpw - m 4 mp 4, 7.40;
α - () ;
Qb - ,
(7.63) |
b, h 0 - () , ;
- , 7.79;
m - ,
(7.64) |
1,3 2,5,
Rb,sh - ;
τq - ;
|
|
τq ≤ 0,25 Rb,sh - , τq > Rb,sh - ;
- , ,
Qrw = 1000 Arw K, | (7.65) |
Arw - , , β, .
(7.66) |
, , β = 90
Qrw = 1000 Arw. | (7.67) |
7.79 , . 2 h 0 () 45 60 - . .
7.80
(7.68) |
σmt - ;
τb - .
7.81 ,
Q ≤ Qb + Qrw. | (7.69) |
7.82 Q .
Qb, (7.63), kt,
(7.70) |
0,2 (N - ).