8.44 . - , - , ( 8.1), .
8.1 - ,
8.45 , , , 0,2σ x, (h, hw) (bf, bh,) (t, tw, tf, th) ( α - , σ x, σ x , cr , ef ).
α :
bh, h, ( 8.1, - e), -
(8.55) |
hw, bf, ( 8.1, a, , ), -
(8.56) |
(8.55) (8.56):
- , 8.22;
ξ - , ( )
(8.57) |
σ , - , , (8.4) - (8.25) , æ, æ x, æ y, ψ, ψ x, ψ y, 1,0.
8.22
bh / h | ||||
0,067 | 0,5 | |||
( 4.1, ) | ||||
( 4.1, ) | ||||
( 4.1, ) | ||||
( 4.1, ) | ||||
h ( 4.1, ) | ||||
( 4.1, ) | ||||
, 8.22: 1 8.22, . 2 bh / h. 8.22. , , bh / h = 1 100. |
σ , cr , f 8.23 σ , cr , f σ x / m ( m - , 8.15).
8.23
σ x , cr, | σ , cr , f . | |
235 | 176 | 1,111σ x , cr |
176 205 | ||
205 | ||
325 - 345 | 186 | 1,111σ x , cr |
186 284 | ||
284 | ||
390 | 206 | 1,111σ x , cr |
206 343 | ||
343 |
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