1.?2.?3.? 4.?? 6

5.?6.ea7.ei=0.3h0?8.?

9.?10.? 11.?12.Nu-Mu?

?

?

?? 12

? M/NM/NMNNM

eaea12 fc;fc

ei=0.3h0?b,>b fy fcminmine0b/b0.3,0.3e0b,min=0.3h0 ei e0b,min= 0.3h0ei> e0b,min= 0.3h0

? 1 2:

? 12

? NMAsAsei>0.3h0 ei0.3h0AsA sAsA sxxxbxxb AsA sAs+A sbh05%

? =N/ fcbh0b0.3h0NbNb= 1 fc bh0bei>0.3h0NNbei0.3h0ei>0.3h0NNb

Nu-Mu?1 Mu=0 Nu Nu=0 Mu Mu2 NuMu NuMu3NuNu-Mu

6-1N3000kN4.2m400mmC35HRB335HPB2352A's6

,828 As' 4926mm2 = As/A =4926/125600=3.92%

6-2N1000kNM430kNmbh =400mm500mml05.0mC30HRB335AsA's1e0ei2h

3

45

5

6-36-2As' 2463mm2AsN=Nu , M= Nu e

6-4N1200kNbh =400mm600mmaa'45mml04mC40HRB400As' 1520mm2 As1256mm2 h

l0/h4000/6006.67h1.0ei423mmea20mme0 ei ea42320403mmM=N e0=12000000.403=483.6kNmhM = 483.6kNm

6-5N5280kNM24.2kNmbh =400mm600mmaa'45mml03mC35HRB400AsA's Nu = N, MuM= Nu e0 e0=M/N=4.58mmea=600/30=20mmei e0 +ea4.58+2024.58mm1e0ei2h

3

4AsA's10.8 Asminbh00.002400555444mm =1.212>h/h0=1.081

Ase'=0.5h-a'-e0-ea h'0=h-a' As 2210mm225mm, As2454mm2, A's2945mm2,

5

6-66-2,AsA's14AsA's