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单层柱面网壳精细化有限元模型虽有较好的模拟精度,但是由于其建模复杂而且计算费时,所以它难以应用到工程实际进行模拟分析.为了简化计算,对精细化模型的等效简化模型进行了研究.前期已经研究出一种等效模型的方便建模方法.为了研究PGA(地震动峰值加速度)对等效模型模拟精度的影响,建立了四组尺寸不同的单层柱面网壳模型,每组包括两类模型,即精细化壳单元模型和与之对应的等效简化模型.因结构参数不同,输入的地震动峰值加速度也不同.对四组模型进行动力失效分析,选用的加速度值接近结构失稳的临界值.模拟结果显示:随着失效临界加速度值的改变,各组简化模型的等效效果都较好.因此,等效简化模型的精度受地震动加速度的影响较小,可以忽略不计.
Although the finite element model of single-layer reticulated shell has better simulation accuracy, it is difficult to apply to the actual engineering simulation because of its complicated modeling and time-consuming calculation.In order to simplify the calculation, Efficient simplified model.A convenient modeling method of equivalent model has been developed in the past.In order to study the influence of PGA (peak ground motion acceleration) on the simulation accuracy of the equivalent model, four sets of single-layer columns with different sizes The model consists of two models, that is, the refined shell element model and its equivalent simplified model. Because of different structural parameters, the input peak acceleration of ground motion is also different. The dynamic failure analysis of the four models , The selected acceleration value is close to the critical value of structural instability.The simulation results show that the equivalent effect of the simplified model is better with the change of the critical critical acceleration value.Therefore, the accuracy of equivalent simplified model is affected by the acceleration of ground motion The impact is small and negligible.