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节点位移的控制是折叠网架结构正常使用的关键。根据概率理论和数理统计原理建立二维连续型随机变量位移和荷载的概率预测模型,基于有限的试验数据,进行不同雪荷载工况下节点位移的预测。计算结果表明:100,120,140mm厚雪荷载作用时,节点竖向位移和水平位移预测值与试验测试值吻合较好,所有节点平均预测精度大于或等于97.0%;分析了边跨节点和120mm厚雪荷载作用下的节点位移预测值与实测值偏差较大的原因;120mm厚雪荷载作用时的节点位移应格外关注;相邻两级荷载的比值大于0.8是模型适用的条件。
Node displacement control is the key to the normal use of the folded grid structure. Based on the theory of probability and the principle of mathematical statistics, a two-dimensional probabilistic prediction model of displacement and load of continuous random variables is established. Based on the finite experimental data, the prediction of node displacement under different snow loads is carried out. The calculated results show that the predicted values of vertical displacement and horizontal displacement of the joints agree well with the experimental values when the snow loads are 100, 120 and 140mm thick, and the average prediction accuracy of all nodes is 97.0% or more. The predicted displacement of the node under the action of a large deviation from the measured value; the displacement of the node under the load of 120mm thick snow should pay special attention; the ratio of two adjacent loads greater than 0.8 is the applicable condition of the model.