圓形截面偏心受壓正截面抗壓承載力與裂縫計算,,,,,,,

圓截面半徑r（m）,0.65,砼強度等級,C30,數(shù)據(jù)輸入部分,,,

縱向鋼筋所在圓周半徑rs(m),0.5875,鋼筋種類,HRB400,,,,

鋼筋直徑(mm),25,結構重要性系數(shù)γ0,1,,,,

鋼筋根數(shù),30,構件長度L（m）,4.200,,,,

l0/r=,5.169,構件計算長度l0（m）,3.360,,,,

l0/h=l0/2r=,2.585,公用數(shù)據(jù),,,,,

有關圓截面鋼筋混凝土偏心受壓構件正截面的承載力計算，僅適用于強度等級C50及以下混凝土制作的構件,,,,,,,

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偏心受壓構件正截面抗壓承載力驗算,,,,,,,

Md(kN·m),1395,Nd(kN),9569,,,,

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最大裂縫計算,,,,,,,

作用長期效應組合內力值Nl=,,3827.76,kN或kN·m,,,,

作用短期效應組合內力值Ns=,,6698.58,kN或kN·m,,,,

作用短期效應組合內力值Ns=,,6698.58,kN,,,,

作用短期效應組合內力值Ms=,,976.29,kN·m,,,,

混凝土保護層厚度C=,,0.05,m,,,,

縱向鋼筋直徑d=,,25,mm,,,,

鋼筋混凝土構件所在的環(huán)境類別：,,Ⅱ類,,,,,

注：1、上表粉色為須填寫的數(shù)據(jù)；2、以下各表紅色為判斷結果；3、請核對以下表格中的藍色數(shù)據(jù)。,,,,,,,

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計算結果部分,,,,,,,

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計算參數(shù),,,,,,,

圓截面半徑r（m）,0.65,鋼筋面積As（m2）,0.0147262,,,,

縱向鋼筋所在圓周半徑rs(m),0.5875,鋼筋種類,HRB400,,,,

截面砼面積A（m2）,1.327,鋼筋強度fsd=fsd'(MPa),330,,,,

截面慣性矩I（m4）,0.140,配筋率ρ=As/πr2,0.011094675,,,,

截面回旋半徑i（m）,0.325,鋼筋彈性模量Es(MPa),200000,,,,

截面有效高度h0=r+rs（m）,1.2375,墩高L（m）,4.200,,,,

g=rs/r,0.903846154,計算墩高l0（m）,3.360,,,,

砼強度等級,C30,l0/r,5.169,,,,

砼強度設計值fcd(MPa),13.8,l0/i,10.33846154,,,,

"砼強度等級fcu,k(MPa)",30,l0/h=l0/2r,2.585,,,,

混凝土極限壓應變εcu,0.0033,結構重要性系數(shù)γ0,1,,,,

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配筋率,,,,,,,

全部縱向鋼筋配筋率=,1.11%,"≥0.5%,滿足規(guī)范要求",,,,,

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偏心受壓構件正截面抗壓承載力驗算,,,,,,,

Md(kN·m),1395,Nd(kN),9569,,,,

ζ1,0.518,e0=Md/Nd,0.146,,,,

ζ2,1.000,ηe0,0.1457,,,,

偏心距增大系數(shù)η,1.000,ξ=x0/2r,0.915,,,,

受壓區(qū)矩形應力分布高度x,0.952,,,,,,

實際受壓區(qū)高度x0（m）,1.189382869,A,2.464073841,,,,

β=x/x0,0.8,B,0.463530778,,,,

θc（弧度）,2.053138992,C,2.003214301,,,,

θsc（弧度）,1.47651447,D,0.868766808,,,,

θst（弧度）,3.141592654,e0(2),0.1458,,,,

γ0Nd,9569.4,滿足規(guī)范要求,公式5.3.9-1,,,,

5.3.9-1右,17465.5,,,,,,

γ0Nde,1394.7,滿足規(guī)范要求,公式5.3.9-2,,,,

5.3.9-2右,2546.2,,,,,,

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,,,,偏差,e0(2)=,0.145786014,"根據(jù)“C.0.2-1的e0=ηe0”用excel菜單

""工具->單變量求解""可快速解得ξ"

,,,,0.0%,e0(2)-ηe0=,0.000040199,

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裂縫寬度計算(JTGD62-2004第6.4.5條),,,,,,,

作用長期效應組合內力值Nl=,,,3827.76,kN或kN·m,,,

作用短期效應組合內力值Ns=,,,6698.58,kN或kN·m,,,

作用短期效應組合內力值Ns=,,,6698.58,kN,,,

作用短期效應組合內力值Ms=,,,976.29,kN·m,,,

構件截面半徑r=,,,0.65,m,,,

縱向受拉鋼筋配筋率ρ=As/πr2=,,,0.011095,,,,

"混凝土立方體抗壓強度標準值fcu,k=",,,30,MPa,,,

偏心距e0=Ms/Ns=,,,0.146,m,,,

使用階段軸向力偏心距增大系數(shù),,,1.0142,,,,

鋼筋應力,,,-106.2,Mpa,鋼筋應力≤24MPa，不必驗算裂縫寬度,,

鋼筋彈性模量Es=,,,200000,Mpa,,,

混凝土保護層厚度C=,,,50,mm,,,

鋼筋表面形狀系數(shù)C1=,,,1.0,,,,

作用長期效應影響系數(shù)=,,,1.286,,,,