1＃
屋面板（上人）
1、（5400*5700）混凝土C25，HRB235
1、板厚h=l/40=5400/40=135mm,取h=150mm
2、荷载
恒载Gk7.0
活载Qk2.0
q=1.2*7.0+1.4*2.0=11.20
=L2/L1=5700/5400=1.06,=0.89,=1.4,4=0.027
M1=ql=11.20*5.4*5.4*0.027=8.82kn.m/mAs=375mm10@200(As=393mm)
M2=M1=0.89*8.82=7.85kn.m/mAs=330mm
MI=MI`=M1=1.4*8.82=12.35kn.m/mAs=500mm10@150(As=524mm)
MII=MII`=M2=1.4*7.85=11.00kn.m/mAs=392mm10@200(As=393mm)
板的最小配筋率=0.45c=0.45*1.27/210=0.0027>0.002
故取=0.0027,=bh=0.0027*120*1000=3248@150(As=335mm)
2、（3000*5100）混凝土C25，HPB235
1、板厚h=l/40=3000/40=75mm,取h=120mm
2、荷载
恒载Gk6.25
活载Qk2.0
q=1.2*6.25+1.4*2.0=10.30
=L2/L1=5100/3000=1.7,=0.35,=1.4,4=0.049
M1=ql=10.30*3.0*3.0*0.049=4.54kn.m/mAs=240mm
M2=M1=0.35*4.54=1.60kn.m/mAs=240mm
MI=MI`=M1=1.4*4.54=6.36kn.m/mAs=320mm
MII=MII`=M2=1.4*1.60=2.24kn.m/mAs=240mm
板的最小配筋率=0.45c=0.45*1.27/210=0.0027>0.002
故取=0.0027,=bh=0.0027*120*1000=3248@150(As=335mm)
2#
1、（4300*6800）混凝土C25，HPB235
1、板厚h=l/40=3000/40=75mm,取h=120mm
2、荷载
恒载Gk6.25
活载Qk2.0
q=1.2*6.25+1.4*2.0=10.30
=L2/L1=6800/4300=1.58,=0.40,=1.4,4=0.033
M1=ql=10.30*4.3*4.3*0.033=6.28kn.m/mAs=330mm
M2=M1=0.40*6.28=2.51kn.m/mAs=240mm
MI=MI`=M1=1.4*6.28=8.79kn.m/mAs=360mm10@200(As=393mm)
MII=MII`=M2=1.4*2.51=3.51kn.m/mAs=240mm
板的最小配筋率=0.45c=0.45*1.27/210=0.0027>0.002
故取=0.0027,=bh=0.0027*120*1000=3248@150(As=335mm)
2、（5700*4400）混凝土C25，HPB235
1、板厚h=l/40=3000/40=75mm,取h=120mm
2、荷载
恒载Gk6.25
活载Qk2.0
q=1.2*6.25+1.4*2.0=10.30
=L2/L1=5700/4400=1.30,=0.59,=1.4,1=0.033
M1=ql=10.30*4.4*4.4*0.033=6.58kn.m/mAs=330mm
M2=M1=0.59*6.58=3.88kn.m/mAs=240mm
MI=MI`=M1=1.4*6.58=9.21kn.m/mAs=450mm10@150(As=524mm)
MII=MII`=M2=1.4*3.88=5.43kn.m/mAs=250mm
板的最小配筋率=0.45c=0.45*1.27/210=0.0027>0.002
故取=0.0027,=bh=0.0027*120*1000=3248@150(As=335mm)
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