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。
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。
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。
That horizontal member of the portal frame consists of two longitudinal pre-stressed concrete box type beams overpassing the big span.
两个箱型梁水平构件构成了教室与展区的天花板及地板，并在理论教室和展示区的配置考量下而设计成不同的高度。
That horizontal member of the portal frame consists of two longitudinal pre-stressed concrete box type beams overpassing the big span.
两个箱型梁水平构件构成了教室与展区的天花板及地板，并在理论教室和展示区的配置考量下而设计成不同的高度。
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