在分析具有一层以上的预应力筋或普通钢筋的预应力混凝土构件时,使得应力损失和变形的计算更复杂化,特别是含有多层钢筋的组合构件。在这种情况下,用所谓“徐变换算”截面特性值,按准弹性(quasi-elastic)应力分析方法,就能大大地简化分析计算工作。 Computation of stress losses and deformations is more complicated when analyzing prestressed concrete members with more than one layer of prestressed tendons or plain reinforcements, especially composite members with multiple layers of reinforcement. In this case, using the so-called “creep” cross-sectional characteristic values ​​and quasi-elastic stress analysis methods, the analytical work can be greatly simplified.