柔性横系梁钢管混凝土双柱墩抗震性能分析
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摘要
基于Pushover分析方法与滞回分析,探索柔性横系梁对钢管混凝土双柱式桥墩抗震性能的影响,采用非线性纤维梁柱单元,建立单柱墩、柔性横系梁双柱墩和刚性横系梁双柱墩模型,并进行计算对比分析,研究横系梁刚度的变化对墩顶位移能力、位移延性系数及滞回性能的影响。结果显示,随横系梁刚度增大,墩顶的位移延性能力减小,位移延性系数增大,桥墩水平承载能力提高,同时滞回耗能性能提高。
Based on pushover analysis and hysteretic analysis method, this paper explored effect of link beam on seismic performance of circular concrete-filled steel tube double-column bent. The non-linear fiber beam column element was applied to construction of three respective models: single-column bent model, link beam double-column model and rigid link beam doublecolumn model. It studied the difference of capacity on the top pier, displacement ductility factor and hysteretic behavior by changing the stiffness of link beam. The results indicated that with the increasing stiffness of link beam, displacement ductility factor capacity on the top pier decreased, while displacement ductility factor, load-carrying capacity of piers and the hysteretic behavior gradually increased.
Based on pushover analysis and hysteretic analysis method, this paper explored effect of link beam on seismic performance of circular concrete-filled steel tube double-column bent. The non-linear fiber beam column element was applied to construction of three respective models: single-column bent model, link beam double-column model and rigid link beam doublecolumn model. It studied the difference of capacity on the top pier, displacement ductility factor and hysteretic behavior by changing the stiffness of link beam. The results indicated that with the increasing stiffness of link beam, displacement ductility factor capacity on the top pier decreased, while displacement ductility factor, load-carrying capacity of piers and the hysteretic behavior gradually increased.
引文
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[2]解琳琳,叶献国,种迅,等.Open SEES中混凝土框架结构节点模型关键问题的研究与验证[J].工程力学,2014,31(3):116-121.
[3]鲍飞宇.基于Opensees的铁路空心高墩地震反应研究[J].铁道标准设计,2014,58(1):64-68.
[4]Hui Liu,Minghua He,Yuqi Luan,et al.Modified constitutive model for FRP confined concretein circular sections and its implementation with Open Sees programming[J].Journal of Zhejiang University-Science A(Applied Physics&Engineering),2013(12):856-866.
[5]Priestley M J N.,Seible F.,Calvi G.M.Seismic Design and Retrofit of Bridges[M].John Wiley&Sons,Inc.1996.
[6]Freeman S A,Nicoletti J P,Tyrell J V.Evaluations of existing buildings for seismic risk-A case study of Puget Sound Naval Shipyard[C]∥Proceedings of 1st United States National Conference on Earthquake Engineering,1975:113-122.
[7]韩林海,陶忠,刘威.钢管混凝土结构理论与实践[J].福州大学学报(自然科学版),2001,29(6):24-34.
[8]韩林海.钢管混凝土结构-理论与实践[M].北京:科学出版社,2004.
[9]BS5400,Part5.Steel Concrete and Composite Bridges[S].1979.
[10]胡伟红.CFRP加固钢筋混凝土柱受剪承载力分析及抗震性能试验研究[D].北京:清华大学,2004.
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