强震下弦支穹顶结构的动力性状精细化研究
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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。
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.
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.
引文
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[2]Attiogbe G,Morris G.Moment-rotation functions forsteel connections[J].Journal of Civil Engineering,ASCE,1991,117(7):1703―1718.
[3]Kishi N,Chen W F.Moment-rotation relation ofsemi-rigid connections with angles[J].Journal of Struc-tural Engineering,ASCE,1990,116(7):1813―1834.
[4]范峰,曹正罡,崔美艳.半刚性节点单层球面网壳的弹塑性稳定性分析[J].哈尔滨工业大学学报,2009,41(4):1―6.Fan Feng,Cao Zhenggang,Cui Meiyan.Elasto-plasticstability of semi-rigidity joint single-layer reticulateddomes[J].Journal of Harbin Institute of Technology,2009,41(4):1―6.(in Chinese)
[5]陈志华,李阳,康文江.联方型弦支穹顶结构研究[J].土木工程学报,2005,38(5):34―40.Chen Zhihua,Li Yang,Kang Wenjiang.Analysis oflamelia suspend dome systems[J].China Civil Engi-neering Journal,2005,38(5):34―40.(in Chinese)
[6]Jean L.损伤力学基础[M].倪金刚,陶春虎,译.北京:科学出版社,1996.Jean L.The basis of damage mechanics[M].Translatedby Ni Jingang,Tao Chunhu.Beijing:Science Press,1996.(in Chinese)
[7]Shen Zuyan,Dong Bao.An experiment-based cumula-tive damage mechanics model of steel under cyclic load-ing[J].Advances in Structural Engineering,1997,1(1):79―87.
[8]张增军,马人乐,张哲.弦支穹顶结构动力反应分析[J].世界地震工程,2006,22(4):89―94.Zhang Zengjun,Ma Renle,Zhang Zhe.Dynamic analysisof suspend-dome structures[J].World Earthquake Engi-neering,2006,22(4):89―94.(in Chinese)
[9]王秀丽,孙晓骥,赵玉慧.地震作用下弦支穹顶结构动力稳定性参数分析[J].空间结构,2008,14(3):22―27.Wang Xiuli,Sun Xiaoji,Zhao Yuhui.Parametric study ofdynamic stability of suspend domes under earthquake[J].Spatial Structures,2008,14(3):22―27.(in Chinese)
[10]张爱林,张庆亮,王冬梅.2008奥运羽毛球馆弦支穹顶结构整体稳定及动力性能研究[J].钢结构,2008,23(6):1―6.Zhang Ailin,Zhang Qingliang,Wang Dongmei.Theresearch of overall stability and dynamical capability tothe suspen-dome structures of the badminton arena for2008 Olympic Games[J].Steel Construction,2008,23(6):1―6.(in Chinese)
[11]付志强.弦支穹顶结构动力灾变研究[D].杭州:浙江大学,2007.Fu Zhiqiang.Research on dynamic failure of suspen-dome structure[D].Hangzhou:Zhejiang University,2007.(in Chinese)
[12]丁阳,郭峰,李忠献.地震作用下空间网架结构考虑损伤累积效应的弹塑性分析[J].工程力学,2005,22(1):54―58.Ding Yang,Guo Feng,Li Zhongxian.Elasto-plasticanalysis of spatial trusses under earthquake excitationsconsidering damage accumulation effect[J].EngineeringMechanics,2005,22(1):54―58.(in Chinese)
[13]沈祖炎,沈苏.高层钢结构考虑损伤累积及裂纹效应的抗震分析[J].同济大学学报,2002,30(4):393―398.Shen Zuyan,Shen Su.Seismic analysis of tall steel struc-tures with damage accumulation and fracture effects[J].Journal of Tongji University,2002,30(4):393―398.(inChinese)
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