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-ω_p和ω_s的选择决定于经济的和设计的因素。-预应力度是设计的结果而不是设计的先决条件。-对预应力度无论下什么定义,它是随情况不同而变化的,它不是特征指标。-对设计目的而言,极限承载能力通常是有决定意义的。当然,在营运荷载下的作用(裂缝、变形、疲劳)也同样需要研究考虑;失压作用以后钢筋的应力在这里是一个重要因素。恰当的钢筋布置对裂缝的形成有良好的影响。-精细控制预应力钢筋中的预应力,对营运荷载下的作用来讲是头等重要的事情。为避免意外的预应力损失,应该弄清楚预应力钢筋的摩阻特性。
The choice of -ω_p and ω_s depends on economic and design factors. - Pre-stress is the result of design rather than a prerequisite for design. - No matter what the definition of prestressing force, it varies from situation to situation, it is not a characteristic indicator. For ultimate design purposes, ultimate carrying capacity is usually decisive. Of course, the role of the operating load (cracks, deformation, fatigue) also need to consider the study; loss of pressure after the stress of steel is an important factor here. Proper reinforcement arrangement has a good effect on the formation of cracks. - Fine control of prestressing in prestressed bars is of paramount importance to the role of operating loads. In order to avoid unexpected loss of prestressing, the frictional characteristics of prestressed reinforcement should be clarified.