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部分预应力砼梁裂缝宽度计算或疲劳验算以及钢筋砼小偏压构件正截面强度计算,均需求算关于截面受压区相对高度系数ξ的三次方程。本文用常用的数学方法给出ξ的精确解。文中给出了文献[5]、[6]中例题的本文解法。
For the calculation of the crack width of some prestressed truss beams or the calculation of the fatigue strength and the calculation of the strength of the normal section of the small eccentrically biased member of the reinforced concrete, the cubic equation of the relative height coefficient ξ of the compression zone of the section needs to be calculated. This article uses the commonly used mathematical methods to give the exact solution of ξ. In this paper, we give the solutions of the examples in [5] and [6].