早期大跨径连续梁桥改造中的抗震方案比选
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摘要
以位于强震区、建于20世纪70年代的一座大跨径连续梁桥改造工程为背景,分析比较了常规设计方案以及常用的减震和隔震技术方案的抗震可行性.结果表明:常规设计方案难以满足抗震要求;采用Lock-up装置的减震方案不适用于纵桥向自振基本周期较短的改建桥梁;在合理的参数设计下,粘滞阻尼器减震方案可在一定程度上降低下部结构的地震需求;固定-滑动型支座隔震方案可显著降低下部结构的地震需求,然而有上部结构无法复位的缺陷;摩擦摆式支座隔震方案既可显著降低下部结构的地震需求,又可有效控制上部结构的位移反应,是理想的抗震方案.
Based on the reconstruction project of a long-span continuous girder bridge built in the early 1970s,which located in a strong seismic region,the seismic feasibility of conventional design scheme and commonly used seismic mitigation and isolation technique schemes are compared.It is found that: the conventional design scheme is difficult to satisfy the seismic requirements;the lock-up technology is not suitable for those reconstruction bridges with short longitudinal natural periods;the viscous damping technology with reasonable parameters selected can partly reduce the seismic demands of the substructure;the sliding isolation technology can largely reduce the seismic demands of the substructure,but with the defect of unrecoverable displacement of the superstructure;the friction pendulum seismic isolation technology is the best choice for the seismic demands of the substructure can be largely reduced and the displacement response of the superstructure can be effectively controlled.
Based on the reconstruction project of a long-span continuous girder bridge built in the early 1970s,which located in a strong seismic region,the seismic feasibility of conventional design scheme and commonly used seismic mitigation and isolation technique schemes are compared.It is found that: the conventional design scheme is difficult to satisfy the seismic requirements;the lock-up technology is not suitable for those reconstruction bridges with short longitudinal natural periods;the viscous damping technology with reasonable parameters selected can partly reduce the seismic demands of the substructure;the sliding isolation technology can largely reduce the seismic demands of the substructure,but with the defect of unrecoverable displacement of the superstructure;the friction pendulum seismic isolation technology is the best choice for the seismic demands of the substructure can be largely reduced and the displacement response of the superstructure can be effectively controlled.
引文
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[5]陈永祁,耿瑞琦,马良喆.桥梁用液体黏滞阻尼器的减振设计和类型选择[J].土木工程学报,2007,40(7):55-61.
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[8]张国振.公路桥梁考虑支承耐震性能之研讨[C]//房贞政,等.第四届全国防震减灾工程学术研讨会议论文集.北京:中国建筑工业出版社,2009:686-692.
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[10]龚健,周云.摩擦摆隔震技术研究和应用的回顾与前瞻:I[J].工程抗震与加固改造,2010,32(3):1-10.
[11]周云,龚健.摩擦摆隔震技术研究和应用的回顾与前瞻:II[J].工程抗震与加固改造,2010,32(4):1-19.
[12]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.
[13]吴陶晶,李建中,管仲国.减隔震装置作用机理及其在大跨度连续梁桥中的应用[J].结构工程师,2009,25(4):102-107.
[14]杨喜文,李建中,雷昕弋.多孔大跨径连续梁桥减隔震技术应用研究[J].中国公路学报,2011,23(6):58-65.
[15]徐秀丽,段好安,郎冬梅,等.预应力混凝土大跨连续梁桥隔震设计[J].公路交通科技,2009,26(8):46-50;56.
[2]龚一琼,胡勃,袁万城,等.连续梁桥的减隔震设计[J].同济大学学报,2001,29(1):94-98.
[3]郭磊,李建中,范立础.大跨径连续梁桥减隔震设计研究[J].土木工程学报,2006,39(3):81-85.
[4]卓卫东,孙颖,谷音.长大公路混凝土连续梁桥抗震方案比选[J].土木工程与管理学报,2011,28(9):313-320.
[5]陈永祁,耿瑞琦,马良喆.桥梁用液体黏滞阻尼器的减振设计和类型选择[J].土木工程学报,2007,40(7):55-61.
[6]王磊,刘寒冰,吴斌暄,等.新型地震结构保护系统的大跨径桥梁抗震分析[J].哈尔滨工业大学学报,2004,36(12):1 665-1 667;1 728.
[7]王志强,葛继平.粘滞阻尼器和Lock-up装置在连续梁桥抗震中应用[J].石家庄铁道学院学报,2006,19(1):5-9.
[8]张国振.公路桥梁考虑支承耐震性能之研讨[C]//房贞政,等.第四届全国防震减灾工程学术研讨会议论文集.北京:中国建筑工业出版社,2009:686-692.
[9]Yuan Wan-cheng,Wang Bin-bin,Cheung P,et al.Seismic performance of cable-sliding friction bearing system for isolatedbridges[J].Earthquake Engineering and Engineering Vibration,2012,11(2):173-182.
[10]龚健,周云.摩擦摆隔震技术研究和应用的回顾与前瞻:I[J].工程抗震与加固改造,2010,32(3):1-10.
[11]周云,龚健.摩擦摆隔震技术研究和应用的回顾与前瞻:II[J].工程抗震与加固改造,2010,32(4):1-19.
[12]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.
[13]吴陶晶,李建中,管仲国.减隔震装置作用机理及其在大跨度连续梁桥中的应用[J].结构工程师,2009,25(4):102-107.
[14]杨喜文,李建中,雷昕弋.多孔大跨径连续梁桥减隔震技术应用研究[J].中国公路学报,2011,23(6):58-65.
[15]徐秀丽,段好安,郎冬梅,等.预应力混凝土大跨连续梁桥隔震设计[J].公路交通科技,2009,26(8):46-50;56.
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