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本文将拉索预应力空间网格结构中产生预应力的本质归纳为拉索的初始缺陷长度。并从初始缺陷长度的角度出发，提出了拉索预应力空间网格结构的计算分析方法。证明了该方法与将拉索张力作为外力分析方法的一致性。特别对该结构施工阶段的力学问题作了详细的分析，提出了初始缺陷不变的特点，解决由于拉索分级分批张拉所造成的预应力损失量计算的关键问题。通过文中的两个算例，验证了以上方法的正确性和有效性。
This paper summarizes the nature of the prestress generated in the prestressed spatial grid structure of the cable as the initial defect length of the cable. From the point of view of the initial defect length, a calculation and analysis method for the prestressed space grid structure of cable is proposed. It is proved that the method is consistent with the cable tension as an external force analysis method. Especially, the mechanical problems in the construction stage of the structure are analyzed in detail, and the characteristics of the original defects are invariable. The key problems in the calculation of the loss of prestress caused by the grading and batching of cables are solved. Two examples in the paper verify the correctness and effectiveness of the above methods.