单层柱面网壳强震失稳分析中考虑节点刚度影响的简化模型研究

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (16) : 106-111.

论文

单层柱面网壳强震失稳分析中考虑节点刚度影响的简化模型研究

薛素铎1,2，王宁1,2，李雄彦1,2

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Study on Simple Model of Single-layer Cylindrical Reticulated Shell Considering the effect of Joint Stiffness in stability analysis under Strong Earthquake

XUE Suduo1,2, WANG Ning1,2, LI Xiongyan1,2

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文章历史 +

摘要

在进行单层柱面网壳强震失稳分析时，采用能考虑球节点轴向刚度和弯曲刚度耦合的壳单元精细化模型固然好，但是壳单元模型的单元数目太多，相对于一般的梁单元简化模型的计算量是非常大的。然而，一般简化模型由于不考虑节点刚度的影响，强震下地震响应分析的结果误差又较大。因此，在简化网壳模型的基础上建立了能等效精细化网壳模型的相对简化模型，此模型在节点区域用梁单元代替空心球节点，通过减小节点区杆件的刚度，可以明显改善模型的分析精度，而且采用模型后计算量增加不大，所以此模型更适合进行此类结构的强震失稳分析。

Abstract

The couple of hollow spherical joint axial and bending stiffness can be considered in the shell element model. In dynamic stability analysis, it can obtain more accurate results than the common beam element model in which the joint stiffness is not considered. However, this shell element model can’t be used in the simulation commonly, because of its huge quantity of elements. It will cost much more time in computing these tasks than the common model. On the other hand, the common beam element model has fewer elements, but the error of the result in using this model is obvious in dynamic analysis. Accordingly, a new model is put forward, which is based on the common used simple model. The only difference between them is the new one can consider the joint stiffness by using beam element in the spherical joint zone. The precision in simulation can be improved clearly by decreasing the stiffness of tubes in the joint zone, and the computing time didn’t increase much. Therefore, this model is fit for the dynamic stability analysis of such structure.

导出引用

薛素铎;王宁;李雄彦;. 单层柱面网壳强震失稳分析中考虑节点刚度影响的简化模型研究[J]. 振动与冲击, 2013, 32(16): 106-111

XUE Suduo;WANG Ning;LI Xiongyan;. Study on Simple Model of Single-layer Cylindrical Reticulated Shell Considering the effect of Joint Stiffness in stability analysis under Strong Earthquake[J]. Journal of Vibration and Shock, 2013, 32(16): 106-111