9.2.10 ,
Np = (σ sp - 330) A'sp + σ sp × Asp, (9.17)
A'sp Asp - , ( ) ;
σ 'sp σ sp - γ sp = 1,1 'sp Asp.
9.2.11
Np × ep £ Rb × b × x (h 0 - 0,5 x) + Rsc × A's (h 0 - a'), (9.18)
- Np , ( ), ( ) ( 9.1),
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, (9.19)
- Np ;
Rb - , ( 6.8) , Rbp;
Rsc - , 330 ;
A's - , .
ξ R, (8.1) es,l = Rs / Es, Rs - As, ε b,ult = 0,003:
) ξ = x / h 0 £ ξ R ( 9.1)
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(9.20)
) ξ = x / h 0 > ξR ( - . 9.1)
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(9.21)
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9.1 - ,
9.2.12 :
) ( 8.2, ), ..
Np £ Rb × b'fh'f - RsAs + RscA's, (9.22)
b'f 9.2.11;
) ( 8.2, ), .. (9.22) ,
Np × ep = Rb × b × (h 0 - 0,5 ) + Rb (b'f - b) × h'f (h 0 - 0,5 h'f) + RscA's (h0 - a'),(9.23)
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; eop - . 9.2.11;
zs - ( ) .
|
|
:
) ξ = x / h 0 £ ξ R (ξ R - . 9.2.11)
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(9.24)
) ξ = x / h 0 > ξ R
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(9.25)