To do the calculations for the deflection and the flaw width of pre stressed concrete tower drum, the stiffness of the cross sections is essentially basic data.
在预应力混凝土塔筒的挠度和裂缝宽度计算中，截面的刚度是必不可少的基本资料。
After that, the calculation method about double pre-stressed composite structure's bearing capability and deflection are investigated, which provide the consults to future research and design works.
另外通过与常规预应力结构的比较，研究了二次预应力组合结构正截面承载能力和结构变形的计算方法，为今后的设计和研究提供了参考。
Based on analyzing the relations of degree of pre-stress to stress, deflection and crack of concrete beam, a design method is pro-posed.
在详细分析了预应力度同梁的应力、位移、开裂的关系的基础上提出了部分预应力混凝土梁的设计方法。
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