. 䳿 . , . , , , , .
. 23.6, , 1. . 䳿 .
Fn , , αn . Fn 쳭 Fr F0, . Fr , F0 . F0 Ft Fa.
, Fn Ft, Fa Fr, , , , .
Ft, , 䳿 1 .
Ft = 21/d1.(23.15)
Fa, , . Ft β Fa = Ft tgβ. (23.16)
Fr 䳺 , . Fr F0 = Ft /cos β, (. . 23.6, )
Fr = F0 tg αn = Ft tg βn /cosβ. (23.17)
Fn Ft, Fa Fr.
Fn = F0/cos αn = Ft / (cosαn cos β), Fn = 2T1/(d1 cosαn cos β). (23.18)
(β = 0) Ft = 21/d1, F= 0, Fr = Ft tgα.(23.19)
Fa , , β (F β). , (. 23.6, ), . . Ft = 21/d1 Fr = F0 tg αn = = Ft tg βn /cosβ.
|
|
. ,
q = (Fn/lΣ) Kα β ν = [Ft/(b ε εα / cosαn)] Kα β ν. (23.20)
Fn lΣ (23.18) (23.14), Kαβ , ; ν , .
Kαβ ν . : Hα, Hβ, KHv ; Fα, Fβ, KFv .
:
WH t= (FHt/ b) Hα, Hβ, KHv, WF t= (FFt/ b) Fα, Fβ, KFv. (23.21)
(23.20) :
q = WH t /(ε εα / cosαn); (23.22)
qF = WF t /(ε εα / cosαn); (23.23)
FHt FFt (23.21) (23.15):
FHt = 2T1H/d1, FFt = 2T1F/d1. (23.24)
T1H = T1F , T1 (. 2.2).
. εβ ≤ 1 . , , Hα = Fα = 1.
. . Hα Fα. Hα, . 23.3, Fα
Fα = [4 + (εα 1) (nCT 5)] / (4εα), (23.25)
nCT . nCT > 9,
nCT = 9 , nCT < 5, nCT = 5.
23.3. Hα | |||||
v, / | Hα | ||||
2,5 | 1,01 | 1,03 | 1,05 | 1,13 | |
1,02 | 1,05 | 1,09 | 1,16 | ||
1,01 | 1,03 | 1,07 | 1,13 | ||
1,01 | 1,04 | 1,09 | |||
1,02 | 1,05 | 1,12 | |||
1,02 | 1,06 |
. , . (. 23.7, ).
|
|
, . 23.7, . . (. q . 23.7, ).
b Kβ, qmax q.
, . .
, , ≤ 350 , ν ≤ 15 /. > 350 v > 15 / . v > 15 / , .
, . ' . .
, , , : ; ; ; , ( , ). , , ψbd = b/d1.
Kβ , . , .
. . 23.8 Hβ Fβ, . 17 17 , ψbd. v< 15 /. , < 350 v < 15 / Hβ=Fβ=1.
23.8, KHβ KFβ
. , . b .
, . , , . , .
|
|
HV KFV. HV KFV. v = 0.5ω1d1