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本文引入初内力的概念，提出并建立初内力准则方程式来简化分析计算预应力网架结构。这种简捷计算法在分析各种预应力工况时，只要一次性建立、分解和应用网架的总刚度矩阵，使计算工作量大为简化。当单根杆件施加预应力、多根杆件施加预应力、同一杆件各股分别施加预应力以及分级分批施加预应力时，采用本文提出的方法可方便求得各工况下预加应力全过程的网架内力和变位及其变化规律，并可一次性地完成预应力施加工作。文中附有多个算例，计算结果表明，本文提出的简捷计算法是正确、可靠和有效的。
In this paper, the concept of initial internal force is introduced and the equation of initial internal force criterion is proposed and simplified to simplify the analysis and calculation of prestressed grid structure. This simple calculation method in the analysis of a variety of prestressed conditions, as long as a one-time establishment, decomposition and application of the total stiffness matrix grid, so that the computational workload greatly simplified. When the prestressing force is applied to a single rod and the prestressing force is applied to a plurality of rods, prestressing is applied to each rod of the same rod and the prestressing force is applied in stages and in stages, the method proposed in this paper can be used to obtain prestressing Stress the whole process of grid internal forces and displacement and its variation, and can be a one-time completion of prestressing work. A number of examples are attached to the paper. The calculation results show that the proposed method is correct, reliable and effective.