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计算部分预应力混凝土梁开裂后截面应力时,需求解中和轴高度的三次方程,使计算显得比较复杂。本文将三次方程简化为二次方程,使计算得到很大简化。
When calculating the section stress after cracking of partially prestressed concrete beams, the solution of the cubic equation of neutral axis height is required to make the calculation more complicated. This paper reduces the cubic equation to a quadratic equation, which greatly simplifies the calculation.