It is rather complicated to compute the neutral axis in partially pre-stressed concrete beams after cracking, since we have to solve a cubic equation.

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。

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The pre-stressed profiled steel concrete beams used in Shen'guang Institution of Education and Research Project are characterized by big span, small cross-section and complicated technology.

深港产学研基地工程采用预应力型钢混凝土梁，具有跨度大、断面小、技术复杂等特点。

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Following the conventional theory of reinforced concrete, analysis the crack distribution of pre-stressed carbon fiber reinforced concrete beams, put forward corresponding formula for calculation.

沿用传统钢筋混凝土理论，对预应力碳纤维加固梁的裂缝进行分析，提出相应计算公式。

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