8.2.23 , :
) , , 8.2.24, 8.2.26;
) , , 8.2.24, 8.2.25 8.2.27.
, [.. (8.116) ] , , .
8.2.32.
8.2.24 , :
(8.140)
0138S10-03623
(8.141)
(8.140):
- .
(8.141):
- , ;
- ;
- .
8.2.25.
8.2.25 1/ r (8.2.24)
, (8.142)
- ( N) , ;
D - ,
D = Eb 1 × Ired, (8.143)
b 1 - , ;
Ired - , .
b 1 Ired 8.2.26 8.2.27 .
8.2.26 D (8.143).
Ired .
Ired = I + Is × α + Is × α, (8.144)
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I - ;
Is, I's - ;
α - ,
(8.145)
I .
Ired .
(8.143), (8.145) :
Eb 1 = 0,85 × Eb; (8.146)
0138S10-03623
(8.147)
φ b,cr - 6.12.
,
8.2.27 :
;
;
;
ψ s.
D (8.143) .
b 1 b,ser, (6.9) Rb,ser ( ).
Ired , α s 1 α s 2
Ired = Ib + Is × α s 2 + I's × α s 1, (8.148)
Ib, Is, I's - , .
Is I's , ( α s 1 α s 2) ( 8.19);
y = x,
- , 8.2.28 ( 8.19).
Ib .
α s 1 α s 2 8.2.30.
8.2.28 ( )
Sb 0 = α s 2 × Ss 0 - as 1 × S's 0,(8.149)
Sb 0, Ss 0 S's 0 - , .
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0138S10-03623
(8.150)
0138S10-03623
(8.151)
( )
0138S10-03623
(8.152)
A'f - .
0138S10-03623
1 -
8.19 - () - ()
( )
0138S10-03623
(8.153)
yN - N, ( ) 0 = M / N;
Ib 0, Is 0, I's 0, Sb 0, Ss 0, S's 0- , .
N
(8.154)
- , (8.149) - (8.152);
Ired, Ared - , ( ).
.
(8.154) , .
8.2.29
D = Es,redAsz (h 0 - xm),(8.155)
z - .
( ) z
(8.156)
, ( ) z 0,8 h 0.
8.2.30 :
(8.157)
(8.158)
Eb,red - , (6.9) , Rb Rb,ser;
Es,red - ,
Es,red = Es /ψ s. (8.159)
ψ s (8.138).
ψ s = 1 , , α s 2 = α s 1. , (8.139) , ψ s, (8.138).
8.2.31 (1/ r) D EI D, , 8.2.25 8.2.29.
8.2.24, D .
D ψ s = 1. D, .. , .
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