大跨度张弦立体桁架结构是一种新型的预应力空间结构形式。
Long-span spatial truss string structure is a new form of prestressed spatial structure.
对立体桁架进行了特征值屈曲分析和非线性屈曲分析，研究其屈曲过程。
In order to research the buckling process of three-dimensional trusses, the eigenvalue buckling analysis and non-linear flection analysis are carried out.
空间立体桁架的多对口对接、平面桁架的翻身过程稳定性是该分项工程的重点和难点。
Therefore, the multiport-butt of 3-D truss, as well as the stability of turning over 2-D truss were the difficulties of the lifting project.
通过计算，找到了立体桁架在强震作用下的薄弱部位，并对弹性和弹塑性计算结果作了对比，其结论可供工程设计人员在设计时参考。
Weak locations of space truss can be found. Through comparing the results of elastic and elastoplastic analysis, some conclusion can be drawn for reference to engineers.
对于相对较小的荷载，可以找到立体钢桁架及立体预应力钢桁架的经济高跨比范围。
For the relatively smaller loads, the economical height-to-span ratio scopes of space steel trusses and space prestressed steel trusses can be found.
通过对大量计算结果的研究，得出了几种跨度下立体钢桁架及立体预应力钢桁架的最优高度。
By study of large amount of computational results, the optimal heights of space steel trusses and space prestressed steel trusses of several spans are got.
通过对大量计算结果的研究，得出了几种跨度下立体钢桁架及立体预应力钢桁架的最优高度。
By study of large amount of computational results, the optimal heights of space steel trusses and space prestressed steel trusses of several spans are got.
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