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为研究预应力球面扁网壳结构性能,以“一次张拉二次加载”预应力设计为例,分析了通常设计的预应力及其引入位置对一类柱支承双层球面扁网壳非线性稳定的影响。为了与张拉时扁网壳支座设计情况相符,编写了计算程序。通过对扁网壳具有不同矢跨比和不同布索方案的设计工程的分析,发现预应力可以适当提高屈曲荷载,但提高幅度不大。当预张力相同时沿拉力环域布索的屈曲荷载提高幅度比在扁网壳支座间布索大。预应力没有改变结构的屈曲特征,对荷载位移平衡路径影响也有限。要较大幅度提高这类结构的屈曲荷载只能采取其它途径。
In order to study the structure of prestressed spherical flat reticulated shell, taking the example of prestressed design of “once loading twice”, the influence of prestressing force and its introduction position on the design of a kind of column supported double- The effect of nonlinear stability. In order to be consistent with the design of flat-shell shell support when tensioning, a calculation program has been prepared. Through the analysis of the design engineering of flat reticulated shells with different aspect ratios and different sack lines, it is found that the prestressing can increase the buckling load properly, but the increase is not large. When the pretension is the same, the buckling load of the cable along the tension zone is larger than that of the cable between the flat reticulated shells. Prestress does not change the buckling characteristics of the structure and has a limited impact on the load-displacement balance path. To significantly improve the buckling load of such structures can only take other ways.