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首先提出一种合理的新型单弦杆平板网架结构模型,通过张拉带有预留缝隙的下弦杆中的内穿钢索,使平板网架整体张拉成空间球面网壳。然后推导出预测成形形状的理论公式,并利用有限元计算程序ANSYS11.0,对不同有限元模型模拟其张拉成形过程。分析表明:理论公式可以很好的预测网壳成形形状,与有限元计算结果吻合较好。其成形形状仅与预留缝隙值大小有关,可以忽略不同节点连接形式对成形形状的影响。最后,对张拉成形前后同一环向各节点的位移情况进行研究,结果表明:位移误差随着预留缝隙值的增大而增大,但并不影响整体成形。
Firstly, a reasonable new single-chord slab truss structure model is proposed. Through the tensioning of the inner wear ropes in the lower chord with the reserved gap, the flat truss is tensioned into a space spherical reticulated shell. Then the theoretical formula of predicted shape is deduced, and the finite element program ANSYS11.0 is used to simulate the tension forming process of different finite element models. The analysis shows that the theoretical formula can well predict the shape of the shell, which is in good agreement with the finite element method. The forming shape is only related to the size of the reserved gap, which can ignore the influence of different node connection forms on the forming shape. Finally, the displacement of each node in the same ring before and after the tensioning is studied. The results show that the displacement error increases with the increase of the reserved gap, but it does not affect the overall forming.