基于性能的钢筋混凝土桥墩抗震变形能力的设计研究
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摘要
在假设位移延性系数的基础上,从约束混凝土本构关系出发,采用基于Park-Ang模型的改进损伤评估模型,得出不同预期性能下的结构等效变形延性系数,进而推导出工程中常用轴压比下的矩形及圆形截面配箍率计算公式,即变形能力公式。通过范立础所做的试验验证实际工程中常用位移延性系数(4～6.5)时变形能力公司的正确性和有效性。并在此基础上总结了钢筋混凝土桥墩的抗震性能化设计的一般步骤,并给出了设计实例。
From the perspective of constitutive model of confined concrete and on the basis of hypothetic displacement ductility index,the equivalent displacement ductility index of different expected performances is acquired with the improved damage assessment model based on Park-Ang model employed,and furthermore,computational formula of stirrups ratio of rectangle and circular section under axial compression ratio of general engineering,that is,deformability formula is deduced,and moreover,its correctness and universality is validated with usual displacement ductility index 4~6.5 in practical engineering through the experimentation of professor Fan Lichu.On this basis,the general procedures of performance-based seismic design of RC bridge piers are concluded and design examples are also enumerated.
From the perspective of constitutive model of confined concrete and on the basis of hypothetic displacement ductility index,the equivalent displacement ductility index of different expected performances is acquired with the improved damage assessment model based on Park-Ang model employed,and furthermore,computational formula of stirrups ratio of rectangle and circular section under axial compression ratio of general engineering,that is,deformability formula is deduced,and moreover,its correctness and universality is validated with usual displacement ductility index 4~6.5 in practical engineering through the experimentation of professor Fan Lichu.On this basis,the general procedures of performance-based seismic design of RC bridge piers are concluded and design examples are also enumerated.
引文
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[6]Park Y.J.,Ang A.H.S.,Seismic damage analysis of reinforcedconcrete buildings[J].Journal of Structural Engineering,ASCE,Vol.111,No.4,1985,740～757.
[7]Luis D.Decanini,Fabrizio Mollaioli.An energy-basedmethodology for the assessment of seismic demand[J].SoilDynamics and Earthquake Engineering,2001,113～137.
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[9]过镇海时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003.
[2]CEB-FIP mode code[S].1990.1993.Thomas Telford.London.
[3]范立础.桥梁延性抗震设计[M].上海:同济大学出版社,2001.
[4]江辉,朱晞.近断层地震地面运动的能量与位移延性需求[J].工程抗震与加固改造,Vol.27,No.4.Aug.2005.
[5]江辉,朱晞.近断层区输入能量设计谱及其在基于能量抗震设计中的运用[J].地震工程与工程振动,Vol.26,No.5.Oct.2006.
[6]Park Y.J.,Ang A.H.S.,Seismic damage analysis of reinforcedconcrete buildings[J].Journal of Structural Engineering,ASCE,Vol.111,No.4,1985,740～757.
[7]Luis D.Decanini,Fabrizio Mollaioli.An energy-basedmethodology for the assessment of seismic demand[J].SoilDynamics and Earthquake Engineering,2001,113～137.
[8]Kowalsky M J,Priestley M J N,Macrae G A.Displacement-baseddesign of RC bridge columns in seismic regions[J].EarthquakeEng.Stru.Dyn.,1995,24:1623～1643.
[9]过镇海时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003.
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