弹性索和阻尼器对斜拉桥横向抗震性能的影响
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摘要
依据减隔震原理,分别在主梁与索塔连接处设置横向弹性索、在主梁与过渡墩连接处设置横向液体粘滞阻尼器,采用非线性时程分析方法,研究其对斜拉桥横向抗震性能的影响。分析发现:合理选用弹性索,可适当降低控制截面的地震响应;限位体系和滑动体系对于横向均非理想的抗震体系,当与阻尼器共同使用时则可有效提高过渡墩及其桩基的抗震性能,但阻尼器+滑动体系会增大索塔及其桩基的地震响应,同时还会产生梁端与过渡墩顶的相对位移。
Based on seismic isolation principles,lateral elastic cables are set on the joint of girder and tower,and the lateral fluid viscous dampers are set on the joint of girder and abutment.The effects of lateral cables and dampers on cable-stayed bridge are studied afterwards by using the nonlinear time-history analysis method.The results indicate that seismic responses of key sections could be properly reduced by rationally choosing elastic cables.Neither of fixed system and sliding system is an appropriate lateral anti-seismic system.Seismic performance of abutments and its pile foundations could be improved with dampers.However,seismic responses of towers and its pile foundations could be increased,and relative displacements between girder-end and abutment-top would appear by using sliding system with dampers.
Based on seismic isolation principles,lateral elastic cables are set on the joint of girder and tower,and the lateral fluid viscous dampers are set on the joint of girder and abutment.The effects of lateral cables and dampers on cable-stayed bridge are studied afterwards by using the nonlinear time-history analysis method.The results indicate that seismic responses of key sections could be properly reduced by rationally choosing elastic cables.Neither of fixed system and sliding system is an appropriate lateral anti-seismic system.Seismic performance of abutments and its pile foundations could be improved with dampers.However,seismic responses of towers and its pile foundations could be increased,and relative displacements between girder-end and abutment-top would appear by using sliding system with dampers.
引文
[1]叶爱君,范立础.超大跨度斜拉桥的横向约束体系[J].中国公路学报,2007,20(2):63~67Ye Ai-jun,Fan Li-chu.Lateral Constraint Systems forSuper-long-span Cable-stayed Bridge[J].China Journal ofHighway and Transport,2007,20(2):63~67(inChinese)
[2]杨玉民,袁万城,范立础.大跨度斜拉桥横向地震反应及其分形特征[J].同济大学学报,2001,29(1):15~19Yang Yu-min,Yuan Wan-cheng,Fan Li-chu.TransverseSeismic Response of Long-span Cable-stayed Bridges andTheir Fractal Characteristic[J].Journal of TongjiUniversity,2001,29(1):15~19(in Chinese)
[3]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001Fan Li-chu,Wang Zhi-qiang.Bridge Seismic-isolatedDesign[M].Beijing:China Communications Press,2001(in Chinese)
[4]王志强,胡世德,范立础.东海大桥粘滞阻尼器参数研究[J].中国公路学报,2005,18(3):37~42Wang Zhi-qiang,Hu Shi-de,Fan Li-chu.Research onViscous Damper Parameters of Donghai Bridge[J].ChinaJournal of Highway and Transport,2005,18(3):37~42(in Chinese)
[2]杨玉民,袁万城,范立础.大跨度斜拉桥横向地震反应及其分形特征[J].同济大学学报,2001,29(1):15~19Yang Yu-min,Yuan Wan-cheng,Fan Li-chu.TransverseSeismic Response of Long-span Cable-stayed Bridges andTheir Fractal Characteristic[J].Journal of TongjiUniversity,2001,29(1):15~19(in Chinese)
[3]范立础,王志强.桥梁减隔震设计[M].北京:人民交通出版社,2001Fan Li-chu,Wang Zhi-qiang.Bridge Seismic-isolatedDesign[M].Beijing:China Communications Press,2001(in Chinese)
[4]王志强,胡世德,范立础.东海大桥粘滞阻尼器参数研究[J].中国公路学报,2005,18(3):37~42Wang Zhi-qiang,Hu Shi-de,Fan Li-chu.Research onViscous Damper Parameters of Donghai Bridge[J].ChinaJournal of Highway and Transport,2005,18(3):37~42(in Chinese)
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