重力坝设计例题—荷载计算可以考资料.ppt

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1、重力坝设计例题三、计算实例大坝实用剖面图荷载计算简图坝体自重计算静水压力泥沙压力浪压力计算扬压力计算坝体自重计算W1=1/2×24×21×21×0.2×1=1058.4(kN)力臂=28.56/2－2/3×21×0.2=11.48(m)坝顶宽度=(34.8－28.8)×0.7=4.2(m)坝基宽度=34.8×0.7+21×0.2=28.56(m)力矩=1058.4×11.48=12150.432(kN•m)W2=24×4.2×34.8×1=3507.84(kN)力臂=28.56/2－21×0.2－4.2/2=7.98(m)力矩=3507.84×7.98=27992.563(kN•m)W

2、3=1/2×24×28.8×28.8×0.7×1=6967.296(kN)力臂=28.56/2－28.8×0.7×2/3=0.84(m)力矩=－6967.296×0.84=－5852.529(kN•m)回计算简图静水压力计算PH1=1/2×9.81×33×33×1=5341.545(kN)力臂=1/3×33=11.0(m)力矩=－5341.545×11.0=－58756.995(kN•m)PH2=－1/2×9.81×2.1×2.1×1=－21.631(kN)力臂=1/3×2.1=0.7(m)力矩=21.631×0.7=15.142(kN•m)PV1=9.81×(33－21)×21×0.

3、2=494.424(kN)力臂=28.56/2－21×0.2/2=12.18(m)力矩=494.424×12.18=6022.084(kN•m)PV2=1/2×9.81×21×21×0.2=432.621(kN)力臂=28.56/2－21×0.2/3=12.88(m)力矩=432.621×12.88=5572.158(kN•m)PV3=1/2×9.81×2.1×2.1×0.7=15.142(kN)力臂=28.56/2－2.1×0.7/3=13.79(m)力矩=－15.142×13.79=－208.805(kN•m)回计算简图回计算简图泥沙压力计算PsH=1/2×6.5×11.1×11.

4、1×tan2(45－18/2)=211.374(kN)力臂=1/3×11.1=3.7(m)力矩=－211.374×3.7=－782.084(kN•m)PsV=1/2×6.5×11.1×11.1×0.2=80.087(kN)力臂=28.56/2－11.1×0.2/3=13.54(m)力矩=80.087×13.54=1084.378(kN•m)回计算简图浪压力计算计算风速V0=1.5×12=18(m/s)，D=900(m)hL=0.59(m)，Lm=6.88(m)由于gD/V02=27.25，hL=h5%，h1%=1.241h5%=0.737，hZ=0.248。Hcr=0.89，H=33>

5、Hcr，且H>Lm/2，深水波PL=1/4×9.81×6.88×(0.737+0.248)=16.62(kN)力矩=－16.62×33=－548.36(kN•m)回计算简图扬压力计算U1=－9.81×2.1×28.56×1=－588.365(kN)力臂=0(m)力矩=0(kN•m)U2=－9.81×6.9×0.25×(33－2.1)=－522.898(kN)力臂=28.56/2－6.9/2=10.83(m)力矩=－5662.98(kN•m)U3=－9.81×1/2×(28.56－6.9)×0.25×(33－2.1)=－820.722(kN)力臂=2/3×(28.56－6.9)－28.5

6、6/2=0.16(m)力矩=－131.32(kN•m)U4=－9.81×1/2×6.9×(1－0.25)×(33－2.1)=－784.346(kN)力臂=28.56/2－1/3×6.9=11.98(m)力矩=－9487.70(kN•m)荷载作用标准值作用设计值力臂(m)弯矩标准值(kN·m)弯矩设计值(kN·m)垂直荷载(kN)水平荷载(kN)垂直荷载(kN)水平荷载(kN)自重W11058.401058.4011.4812150.4312150.43W23507.843507.847.9827992.5627992.56W36967.306967.30-0.84-5852.53-58

7、52.53水平水压力PH15341.555341.55-11.00-58757.00-58757.00PH2-21.63-21.63-0.7015.1415.14垂直水压力PV1494.42494.4212.186022.086022.08PV2432.62432.6212.885572.165572.16PV315.1415.14-13.79-208.80-208.80泥沙压力Psv80.0980.0913.541084.371084.37P