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本文导出了最一般的双筋T形或工形截面部分预应力砼梁开裂后截面中和轴高度的基本方程,并对其作了分析讨论。为简化三次方程的求解,且保证有足够的计算精度,文中给出了三次逼近式。此法不仅可简便地计算各种截面的部分预应力砼梁,而且也适用于钢筋砼偏心受力构件的受压区高度计算。文末附有计算实例。
In this paper, the basic equations for the neutral section height of cracked section of prestressed concrete beams with the most general double-bar T-shaped or I-shaped section are derived and analyzed. In order to simplify the solution of the cubic equation and ensure sufficient calculation accuracy, three approximation formulas are given in this paper. This method can not only easily calculate the partial prestressed truss girders of various sections, but also applies to the calculation of the height of the compression zone of the reinforced concrete eccentrically loaded members. At the end of the text, there are calculation examples.