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该文从车辐式张拉屋盖结构的组成特点出发,提出了一种基于静力位移测量值的索力识别方法。首先通过测量屋盖结构的几何位形,建立有限元模型。然后给真实结构施加特定荷载并测量加载点位移。给有限元模型施加同样的荷载并计算其位移。通过比较计算和实测的位移值,修正并迭代有限元模型中拉索的预应力;当计算位移与实测位移一致时就获得了拉索的真实内力。该方法只需要测量加载的自由度所对应的位移,能够在通用有限元软件ANSYS上进行索力识别,计算结果准确。
In this paper, based on the structural characteristics of vehicle-roofed roof structure, a method of cable force identification based on the measured static displacement is proposed. First, by measuring the geometrical configuration of the roof structure, the finite element model is established. The actual structure is then given a specific load and the displacement of the loading point is measured. Apply the same load to the finite element model and calculate its displacement. By comparing calculated and measured displacement values, the prestressing force of the cable in the finite element model is corrected and iterated. When the calculated displacement is consistent with the measured displacement, the true internal force of the cable is obtained. The method only needs to measure the displacement corresponding to the degree of freedom of loading, and can be used to identify the cable force in the finite element software ANSYS, and the calculation result is accurate.