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
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