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{"sheet":"正三角形截面性质","index":0,"n_rows":15,"n_cols":4,"rows_kept":15,"merged":[[0,0,0,3]],"flags":["formulas_cached_only"]}
["正三角形截面性质计算"]
["b＝",20,"(mm)","正三角形边长 b"]
["h＝",{"v":17.320508063722798,"d":"17.32"},"(mm)","正三角形高 h=b*sin(Pi/3)"]
["A＝",{"v":173.20508063722798,"d":"173.21"},"(mm)","截面面积 A=b*h/2"]
["Ix＝",{"v":2886.7513399651416,"d":"2.8868E+03"},"(mm4)","惯性矩 Ix=b*h^3/36"]
["Ix0＝",{"v":8660.254019895423,"d":"8.6603E+03"},"(mm4)","截面对下边缘惯性矩 Ix0=Ix+(b*h/2)*(h/3)^2"]
["Iy＝",{"v":2886.7513439537997,"d":"2.8868E+03"},"(mm4)","惯性矩 Iy=2*(h*(b/2)^3/36+(b*h/4)*(b/6)^2)"]
["ix＝",{"v":4.0824829018182225,"d":"4.0825E+00"},"(mm)","回转半径 ix=sqrt(Ix/A)"]
["ix0＝",{"v":7.071067806980386,"d":"7.0711E+00"},"(mm)","截面对下边缘回转半径 ix0=sqrt(Ix0/A)"]
["iy＝",{"v":4.08248290463863,"d":"4.0825E+00"},"(mm)","回转半径 iy=sqrt(Iy/A)"]
["Wx＝",{"v":249.9999996545721,"d":"2.5000E+02"},"(mm3)","截面抵抗矩 Wx=Ix/(h*2/3)"]
["Wx0＝",{"v":499.9999993091442,"d":"5.0000E+02"},"(mm3)","截面抵抗矩 Wx0=Ix/(h/3)"]
["Wy＝",{"v":288.67513439538,"d":"2.8868E+02"},"(mm3)","截面抵抗矩 Wy=Iy/(b/2)"]
["γ=",78.5,"(kN/m3)","材料重度 γ(钢材为78.5kN/m3)"]
["G＝",{"v":0.013596598830022396,"d":"0.0136"},"(kN/m)","每延米自重 G=Aγ"]