研究表明在膜结构的找形阶段应适当地加大结构的初始预张力，以减小由于支座变形所造成的预应力损失。
It is found that the prestress should be increased to reduce the loss of prestress with the deformation of the support.
张力控制由于材料存在拉伸变形，要得到系统的精确模型比较困难，适合采用PID控制方法。
It is difficult to get a precise system model as the material will elongate, so it is suit to choose PID control in tension control.
基于不变形预张力的基本概念，建立了斜拉桥成桥状态的多目标、多约束的优化模型，并通过有限元程序求解成桥索力。
Based on the basic concept of the un-deformed pretension of cable, the optimization model of finished state with multi-objective and multi-constraint is used.
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