考虑钢筋腐蚀影响的隔震连续梁桥地震易损性分析
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摘要
采用钢筋面积腐蚀的老化模型,基于云图法对不同时间节点的桥梁老化模型进行地震易损性分析,并采用拉丁超立方抽样(LHS)考虑结构材料的不确定性,从而得到在不同时间节点的地震易损性曲线。文中以一座隔震连续梁桥为分析对象,通过Open Sees平台建立有限元模型,研究随着时间推移隔震连续梁桥地震易损性的变化。研究结论可以为文中的既有隔震连续梁桥的全寿命周期地震易损性分析提供理论参考。
By using the aging model of steel corrosion,the seismic vulnerability analysis of the isolated continuous girder bridge with a consideration of material aging at different time nodes is based on cloud method,and through taking the Latin Hypercube Sampling( LHS) approach,uncertainties of the material is considered. So we obtain seismic vulnerability curves at different points in time. In this paper,the isolated continuous girder bridge is acted as analysis of the object. By using Open Sees to form the finite element model,the change of seismic vulnerability is illustrated in detail as time pass. These achievements will provide theoretical reference and analysis support for the seismic vulnerability analysis of the isolated continuous girder bridge's life cycle.
By using the aging model of steel corrosion,the seismic vulnerability analysis of the isolated continuous girder bridge with a consideration of material aging at different time nodes is based on cloud method,and through taking the Latin Hypercube Sampling( LHS) approach,uncertainties of the material is considered. So we obtain seismic vulnerability curves at different points in time. In this paper,the isolated continuous girder bridge is acted as analysis of the object. By using Open Sees to form the finite element model,the change of seismic vulnerability is illustrated in detail as time pass. These achievements will provide theoretical reference and analysis support for the seismic vulnerability analysis of the isolated continuous girder bridge's life cycle.
引文
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[2]Choe D E,Gardoni P,Rosowsky D,et al.Probabilistic capacity models and seismic fragility estimates for RC columns subject to corrosion[J].Reliability Engineering&System Safety,2008,93(3):383-393.
[3]庞于涛,袁万城,党新志,等.考虑材料劣变过程的桥梁地震易损性分析[J].同济大学学报:自然科学版,2013(3):348-354.PANG Yutong,YUAN Wancheng,DANG Xinzhi,et al.Stochatic fragility analysis of bridge with a consideration of material deterioration[J].Journal of Tongji University:Natural Science Version,2013(3):348-354.(in Chinese)
[4]Enright M P,Frangopol D M.Probabilistic analysis of resistance degradation of reinforced concrete bridge beams under corrosion[J].Engineering Structures,1998,20(11):960-971.
[5]Thoft-Christensen P,Jensen F M,Middleton C R,et al.Assessment of the reliability of concrete slab bridges[R].Dept.of Building Technology and Structural Engineering,1996.
[6]Whiting D,Nagi M.Condition of prestressed concrete bridge components:technology review and field surveys[M].Federal Highway Administration,1993.
[7]Choi E,DesRoches R,Nielson B.Seismic fragility of typical bridges in moderate seismic zones[J].Engineering Structures,2004,26(2):187-199.
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