中文摘要：

为准确进行考虑施工过程多因素非线性耦合效应的预应力拉索施工全过程分析，对空间钢结构预应力拉索施工过程中最活跃参数——索力的确定方法进行提炼和拓展。给出拉索等效预张力的具体概念，并指出在整个预应力施工过程中拉索等效预张力相对索力更加稳定。对比直接法和迭代法用于拉索等效预张力确定时的优缺点，得出迭代法更适用于确定非线性较强的空间预应力钢结构拉索等效预张力的结论。推导基于设计初始态确定拉索等效预张力的增量比值法、定量比值法、补偿法和退化补偿法，并给出相应的基本假定和迭代公式。针对比值法易导致迭代法发散和补偿法迭代速度较慢等缺点，提出综合了增量比值法和退化补偿法的混合法，并给出相应的迭代计算流程。最后，通过济南奥体中心体育馆钢屋盖实际算例验证各种方法的准确性和有效性。

英文摘要：

To accurately analyze the prestressed construction process of spatial prestressed steel structure with the multiple-factor non-linear coupling effects considered, the determination methods for the most active parameter--the cable force are compared and improved. The concept of equivalent pre-tension of cable is provided, and it is pointed out that the equivalent pre-tension is more stable compared to the cable force during the whole prestressed construction process. The direct method and iterative method are compared according to their advantages and disadvantages, and the results show that the iterative method is more suitable for strong nonlinear spatial prestressed steel structure. To determine the equivalent pre-tension based on the initial design state, the incremental ratio method, quantitative ratio method, compensation method, and the degradation compensation method are derived, and the corresponding basic assumptions and iteration formulas are also provided. As for iteration divergence problem associated with the ratio method and slow iteration problem associated with the compensation method, a hybrid method of incremental ratio method and degradation compensation method is proposed, and the corresponding iterative process is also given. Finally, based on Jinan Olympic Sports Center Gymnasium steel roof, the accuracy and effectiveness of various methods are verified.