摩擦摆支座隔震连续梁桥抗震分析的简化计算方法
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摘要
根据摩擦摆系统的简化力学模型,给出了考虑桩土效应、桥墩刚度以及支座非线性的摩擦摆支座减隔震桥梁抗震简化计算方法。对一座预应力混凝土梁拱组合桥的纵桥向减隔震性能开展研究,分析了在不同的支座设计参数下结构的等效刚度、等效阻尼、等效周期等物理参数。建立连续梁桥的等效单自由度振动模型,计算支座设计位移、桥墩剪力、弯矩及轴力。与有限元模型的精细化模拟结果对比可知,本文所提出的简化算法具有较好的计算精度,能够用于研究桥梁纵向的抗震性能。
According to the simplified model offriction pendulum system,a simplified calculation method for seismic analysis offriction pendulum bearing isolated continuous girder bridge was proposed. The longitudinal seismic isolation performance ofa composite bridge with prestressed concrete girder and arch was studied. The equivalent stiffness,equivalent damping and equivalent period ofthe structure under different bearing design parameters were analyzed. The equivalent single degree offreedom vibration model ofcontinuous girder bridge was established,and the design displacement ofbearing,pier shear force,bending moment and axial force were calculated. Compared with the refined simulation results ofthe finite element model,the simplified calculation method proposed in this paper has better calculation accuracy and can be used to study the longitudinal seismic performance ofbridges.
According to the simplified model offriction pendulum system,a simplified calculation method for seismic analysis offriction pendulum bearing isolated continuous girder bridge was proposed. The longitudinal seismic isolation performance ofa composite bridge with prestressed concrete girder and arch was studied. The equivalent stiffness,equivalent damping and equivalent period ofthe structure under different bearing design parameters were analyzed. The equivalent single degree offreedom vibration model ofcontinuous girder bridge was established,and the design displacement ofbearing,pier shear force,bending moment and axial force were calculated. Compared with the refined simulation results ofthe finite element model,the simplified calculation method proposed in this paper has better calculation accuracy and can be used to study the longitudinal seismic performance ofbridges.
引文
[1]周云,龚健.摩擦摆隔震技术研究和应用的回顾与前瞻(Ⅰ)---支座的类型及应用[J].工程抗震与加固改造,2010,32(3):1-10.
[2]IVAN S R,ROBINSON W H,MCVERRY G H.An Introduction to Siemic Isolation[M].Chichbester:John Wiley&Sons,1993.
[3]MARSICO M R.Siesmic Isolation and Energy Dissipation:Theoretical Basis and Applications[D].Napoles:University of Napoles,2008.
[4]ZAYAS V,LOW S,MAHIN S.A Simple Pendulum Technipue for Achieving Seismic Isolation[J].Earthquake Spectre,1990,6:317-334.
[5]周云,龚健.摩擦摆隔震技术研究和应用的回顾与前瞻(Ⅱ)---摩擦摆隔震结构的性能分析及摩擦摆隔震技术的应用[J].工程抗震与加固改造,2010,32(4):1-19.
[6]杨林,常永平,周锡元,等.FPS隔震体系振动台试验与有限元模型对比分析[J].建筑结构学报,2008,29(4):66-72.
[7]焦驰宇,胡世德,管仲国.FPS抗震支座分析模型的比较研究[J].振动与冲击,2007,26(10):113-117,192.
[8]廖平,贾毅,赵人达,等.摩擦摆支座参数对桥梁结构地震响应的影响[J].铁道建筑,2016,56(7):22-25.
[9]中华人民共和国住房与城乡建设部.城市桥梁抗震设计规范:CJJ 166-2011[M].北京:建筑工业出版社,2011.
[2]IVAN S R,ROBINSON W H,MCVERRY G H.An Introduction to Siemic Isolation[M].Chichbester:John Wiley&Sons,1993.
[3]MARSICO M R.Siesmic Isolation and Energy Dissipation:Theoretical Basis and Applications[D].Napoles:University of Napoles,2008.
[4]ZAYAS V,LOW S,MAHIN S.A Simple Pendulum Technipue for Achieving Seismic Isolation[J].Earthquake Spectre,1990,6:317-334.
[5]周云,龚健.摩擦摆隔震技术研究和应用的回顾与前瞻(Ⅱ)---摩擦摆隔震结构的性能分析及摩擦摆隔震技术的应用[J].工程抗震与加固改造,2010,32(4):1-19.
[6]杨林,常永平,周锡元,等.FPS隔震体系振动台试验与有限元模型对比分析[J].建筑结构学报,2008,29(4):66-72.
[7]焦驰宇,胡世德,管仲国.FPS抗震支座分析模型的比较研究[J].振动与冲击,2007,26(10):113-117,192.
[8]廖平,贾毅,赵人达,等.摩擦摆支座参数对桥梁结构地震响应的影响[J].铁道建筑,2016,56(7):22-25.
[9]中华人民共和国住房与城乡建设部.城市桥梁抗震设计规范:CJJ 166-2011[M].北京:建筑工业出版社,2011.