焊接球节点单层球面网壳精细化动力分析

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摘要单层球面网壳几何非线性影响较为明显，强烈地震作用下有发生动力失稳破坏的可能，节点和杆件在强震作用下会发生较大塑性变形和损坏，从而影响整体结构的抗震能力，因此网壳结构引入节点建模的精细化动力分析尤为重要。而传统单层网壳的分析常把焊接球节点假设为完全刚性节点，未考虑节点弯曲刚度、轴向刚度以及扭转刚度的影响，会过高的估计结构抗震承载力，使结果偏于不安全。本文采用ANSYS软件中的 SHELL181壳单元建立了一个跨度为6m的K6(2)型包含焊接空心球节点的精细化网壳模型，研究了网壳的频谱特性、水平和三向地震作用下的承载力，以及节点壁厚变化对动力极限承载力的影响。结果表明，节点的塑性发展会影响网壳的动力稳定性，在满足节点壁厚与杆件壁厚比大于1.5时，节点刚度变化对动力极限承载力影响较小。

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关键词 ：网壳精细化分析, 动力极限承载力, 破坏机理, 频谱特性

Abstract：Latticed domes have obvious geometric nonlinear effects and rather high probability of dynamic instability failure under strong earthquakes. Larger plastic deformations may occur both in the nodes and bars which are likely to affect the seismic performance of the overall structure. It is particularly important to take weld joints into consideration in the studying of the seismic performance of reticulated domes. However, the nodes are assumed to be completely rigid in the traditional analysis. Actually, the nodes have bending, axial and torsional stiffnesses, so, the earthquake analysis results may be unsafe when calculating under this traditional assumption. In the paper, SHELL181 elements in ANSYS were used to build a K6(2) dome model, including hollow spherical joints, with a span of 6 m. The spectral properties of the reticulated dome, the refined dynamic bearing capacity and the effects of joints’ thickness on the bearing capacity were studied. The results show that the joint’s plastic developing will influence the dynamic bearing capacity of the dome. When the ratio of ball thickness to steel tube thickness is above 1.5, the joint can be considered as a rigid connection, the joint rigidity has little influence on the dynamic limit load.

Key words： refined analysis of reticulated dome, dynamic bearing capacity, failure mechanism spectrum characteristic

收稿日期: 2016-11-25 出版日期: 2018-07-15

引用本文:

顾磊1.2 张阳2. 焊接球节点单层球面网壳精细化动力分析[J]. 振动与冲击, 2018, 37(14): 130-140.
GU Lei1,2,ZHANG Yang2. Refined dynamic analysis of a single layer reticulated dome with welded spherical joints. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(14): 130-140.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I14/130

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