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矩形截面钢筋砼构件对称配筋小偏心受压的截而设计．诵常要求解一个关于ζ的三次方程往常为了避免解三次方程，用简化公式计算ζ。图算法不用简化公式，减少了误差。图算依据：将上述三次方程化成根据规范取设代入三次方程得ζ－2．5044ζ2＋Bζ＋C＝0，见图1即由此式所作成。
2. The rectangular section reinforced concrete member is designed to be designed with small eccentric compression of symmetrical bar. Often asked to solve a cubic equation about helium. To avoid solving the cubic equation, use the simplified formula to calculate ζ. The graph algorithm does not simplify the formula, reducing the error. Calculation basis: The above cubic equation is converted into a cubic equation according to the specification. ζ-2.5044 ζ2+Bζ+C=0, see Fig.1.