【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-θ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。更多还原

【Abstract】 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-θ curves of welded ball joints were obtained,and then the semi-rigid joint model was established.Furthermore,five suspend-dome models consider-ing semi-rigid joints,rigid zone of joints and material damage accumulation respectively were analyzed.The re-sults 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.更多还原