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中文摘要：
为了探索强震下材料损伤累积、节点半刚性及节点刚域对弦支穹顶结构动力性能的影响，通过对承受轴力和弯矩共同作用的焊接球节点的有限元分析，得到考虑材料损伤累积的焊接球节点M-O曲线，建立考虑材料损伤累积的半刚性节点、节点刚域模型，然后对5个分别考虑节点半刚性、节点刚域及材料损伤累积的弦支穹顶模型进行对比分析。结果表明：考虑材料损伤累积、节点半刚性使结构塑性发展充分，结构刚度更趋向均匀，会引起结构破坏位置、失效模式及结构延性的转变。考虑材料损伤累积、节点半刚性及节点刚域等对弦支穹顶的动力性能有较大的影响。
英文摘要：
In order to investigate the effect of material damage accumulation, semi-rigid joints and rigid zone of joints on the dynamic behavior of suspend-dome structures under severe earthquakes, finite element analysis was performed on welded ball joints subjected to axial force and bending. The M-O curves of welded ball joints were obtained, and then the semi-rigid joint model was established. Furthermore, five suspend-dome models considering semi-rigid joints, rigid zone of joints and material damage accumulation respectively were analyzed. The resuits show that： semi-rigid joints and material damage accumulation cause fully-developed structural plasticity and uniform structural stiffness; the structural failure areas, failure modes and the structural ductility are also changed. So the semi-rigid joints, rigid zone of joints and material damage accumulation have a great impact on the dynamic behavior of suspend-dome structures.
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