阐述预应力张拉的模拟方法、预应力的确定原则以及在施工中如何控制张拉。鉴于预应力是使张弦梁结构形成自平衡体系、具备较大刚度和体现结构性能优势的关键。研究和探讨了结构施工各阶段该预应力大小的确定方法,通过一次张拉与二次张拉方案各项指标的比较,选择适当的预应力张拉施工方案。最后通过对国家体育馆的计算分析,提出了一些有意义的建议。 Explain the simulation method of prestressing tension, the principle of prestressing and how to control the tension in the construction. In view of the fact that prestressing is a self-balancing system for the beam string structure, it has the key points of greater rigidity and superior structural performance. The method of determining the prestressing force in various stages of structural construction is researched and explored. Through comparing the indexes of primary tensioning and secondary tensioning, the appropriate prestressing tensioning construction scheme is selected. Finally, through the calculation and analysis of the National Stadium, put forward some meaningful suggestions.