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单层柱面网壳精细化有限元模型具有较好的模拟精度,但由于其建模非常复杂又很耗费计算时间,所以很难应用于工程实际中进行分析.为了简化计算并且保证计算精度,对精细化模型的等效简化模型进行了研究.前面的研究得出了一种精度较好的等效模型建模方法,此等效模型可以在保证分析精度的前提下改善计算效率,计算量与常用模型相当.为了研究矢跨比、长宽比、节点和杆件直径等结构参数变化对等效模型模拟精度的影响,建立了5组单层柱面网壳模型,每组两个模型,即精细化壳单元模型和与之对应的等效简化模型.对5组模型的动力失效分析表明,等效简化模型的模拟精度受长宽比、矢跨比、节点和杆件直径等结构参数的影响很小,可以忽略不计.等效简化模型可以广泛应用于此类网壳的强震失效计算.
The finite element model of single-layer reticulated shell has better simulation accuracy, but it is difficult to apply it to engineering practice because of its complexity and time-consuming modeling.In order to simplify the calculation and ensure the accuracy of calculation, The equivalent simplified model of the refined model is studied.The previous research has come up with a more accurate equivalent model modeling method that can improve the computational efficiency under the premise of ensuring the accuracy of the analysis, Which is equivalent to the common model.In order to study the influence of structural parameters such as ratio of sag, ratio of length to width, node and rod diameter on the simulation accuracy of equivalent model, five groups of single-layer cylindrical reticulated shell model , That is, the refined shell element model and the corresponding equivalent simplified model.Analysis of the failure of the five models shows that the simulation accuracy of the equivalent simplified model is affected by the structure of aspect ratio, pitch-span ratio, node and rod diameter The influence of parameters is small and negligible.The equivalent simplified model can be widely applied to the calculation of strong earthquakes in such shell.