矮墩大跨连续梁体系桥纵向减隔震设计
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摘要
以上海大治河桥为实例,分析了矮墩、大跨连续梁体系桥的结构动力特性与地震易损性一般规律。重点探讨了矮墩、大跨连续梁体系桥的纵向地震响应规律与合理抗震设计,并指出了该类桥梁不适宜按延性抗震进行设计。按结构纵向约束要求,提出了采用E型软钢阻尼器组的减隔震设计方案,并给出了具体的设计参数。从非减隔震设计与减隔震设计方案的结构抗震性能对比分析结果可以看出,减隔震设计体系可以有效缓解纵向固定墩支座、墩身以及基础地震惯性力大、构件能力匹配关系难以满足能力保护设计的特点,是矮墩、大跨连续梁体系桥纵向抗震体系的理想解决方案。
Taking Shanghai Dazhi River Bridge for example,structural dynamic characteristics of large-span continuous girder bridge with low piers and general rules of seismic fragility are analyzed in this paper.And longitudinal seismic response of this type bridge and reasonable seismic design are discussed and stressed.It shows that ductility seismic theory is not suitable for this type bridge.According to structure longitudinal constraint requirements,a seismic isolation & reduction plan with E-typed mild steel damper is proposed,and moreover,detailed design parameters are given.Based on the structure seismic performance comparison analysis on seismic non-isolation & reduction design plan and seismic isolation & reduction one,the seismic isolation & reduction design system can reduce greatly the inertia forces transferred to the longitudinal fixed bearings,the pier columns and the pile foundations(matching relationship of members’ capability cannot protect the design).In a word,this seismic isolation & reduction plan discussed hereby is regarded as the ideal anti-seismic solution one for largespan continuous girder bridge with low piers in longitudinal direction.
Taking Shanghai Dazhi River Bridge for example,structural dynamic characteristics of large-span continuous girder bridge with low piers and general rules of seismic fragility are analyzed in this paper.And longitudinal seismic response of this type bridge and reasonable seismic design are discussed and stressed.It shows that ductility seismic theory is not suitable for this type bridge.According to structure longitudinal constraint requirements,a seismic isolation & reduction plan with E-typed mild steel damper is proposed,and moreover,detailed design parameters are given.Based on the structure seismic performance comparison analysis on seismic non-isolation & reduction design plan and seismic isolation & reduction one,the seismic isolation & reduction design system can reduce greatly the inertia forces transferred to the longitudinal fixed bearings,the pier columns and the pile foundations(matching relationship of members’ capability cannot protect the design).In a word,this seismic isolation & reduction plan discussed hereby is regarded as the ideal anti-seismic solution one for largespan continuous girder bridge with low piers in longitudinal direction.
引文
[1]刘健新,赵国辉,李加武.汶川地震及中国公路桥梁抗震设计规范的变迁[J].交通科学与工程,2009,25(1):21-25.
[2]艾庆华,李宏男,王东升,等.基于位移设计的钢筋混凝土桥墩抗震性能试验研究(Ⅱ):振动台试验[J].地震工程与工程振动,2008,28(3):39-46.
[3]JANGID,R.S.Stochastic response of bridges seismically isolatedby friction pendulum system[J].Journal of Bridge Engineering,2008,13(4):319-330.
[4]KUNDE M C,JANGID R S.Seismic behavior of isolated bridges:A-state-of-the-art review[J].Electronic Journal of StructuralEngineering,2003(3):140-170.
[5]冯凌云,叶爱君.多跨连续梁桥的减隔震应用研究[J].桥梁建设,2005(6):5-7.
[6]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.
[7]管仲国,李建中.城市高架桥合理抗震体系选择与经济性对比[J].地震工程与工程振动,2011,31(3):91-98.
[8]NAJM H,PATEL R,NASSIF H.Evaluation of laminated circularelastomeric bearings[J].Journal of Bridge Engineering,2007,12(1):89-97.
[9]MOKHA A,CONSTANTINOU M C,REINHORN A M,et al.Experimental study of friction-pendulum isolation system[J].J.Struct.Eng.,1991,117(4):1201-1217.
[10]GUAN Z,LI J Z,XU Y.Performance test of energy dissipationbearing and its application in seismic control of a long-span bridge[J].Journal of Bridge Engineering(ASCE),2010,15(6):622-630.
[2]艾庆华,李宏男,王东升,等.基于位移设计的钢筋混凝土桥墩抗震性能试验研究(Ⅱ):振动台试验[J].地震工程与工程振动,2008,28(3):39-46.
[3]JANGID,R.S.Stochastic response of bridges seismically isolatedby friction pendulum system[J].Journal of Bridge Engineering,2008,13(4):319-330.
[4]KUNDE M C,JANGID R S.Seismic behavior of isolated bridges:A-state-of-the-art review[J].Electronic Journal of StructuralEngineering,2003(3):140-170.
[5]冯凌云,叶爱君.多跨连续梁桥的减隔震应用研究[J].桥梁建设,2005(6):5-7.
[6]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001.
[7]管仲国,李建中.城市高架桥合理抗震体系选择与经济性对比[J].地震工程与工程振动,2011,31(3):91-98.
[8]NAJM H,PATEL R,NASSIF H.Evaluation of laminated circularelastomeric bearings[J].Journal of Bridge Engineering,2007,12(1):89-97.
[9]MOKHA A,CONSTANTINOU M C,REINHORN A M,et al.Experimental study of friction-pendulum isolation system[J].J.Struct.Eng.,1991,117(4):1201-1217.
[10]GUAN Z,LI J Z,XU Y.Performance test of energy dissipationbearing and its application in seismic control of a long-span bridge[J].Journal of Bridge Engineering(ASCE),2010,15(6):622-630.
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