Question: ( 2 ) 8 0 0 m m 2 , f c k = 4 2 MPa, f y = 4 0 0 MPa .

(2)
800mm2,fck=42MPa,fy=400MPa .
PnbMnb
(SDM).
P-MP=5,000kNMn
.
P-M B .
( 2 ) 8 0 0 m m 2 , f c k = 4 2 MPa, f y = 4 0 0

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