大跨度连续梁桥的减隔震和延性抗震分析
|
摘要
采用加强固定盆式支座和墩柱强度的方法来强行保证大跨度连续梁桥在强震作用下的结构安全,固定墩会承受较大的地震力,由此导致设计的不经济性。针对上述现象,采用弹塑性减震耗能装置方案对强震区大跨连续梁桥进行减隔震设计。计算表明,通过合理设置装置的屈服力以及后屈曲刚度比,弹塑性减震耗能装置可以起到明显减小固定墩所受地震力、提高结构抗震性能的效果。对墩柱进行延性抗震设计,并分析比较不同因素对结构延性的影响。结果表明,考虑墩柱的延性可以有效降低墩柱底部弯矩。配箍率和轴压比对墩柱的延性系数影响较明显,而纵向主筋的配筋率减低,屈服和极限曲率均会降低,对延性系数的影响较小。
If the fixed pot bearing and pier of long-span continuous bridge are reinforced to ensure the structure safety under strong earthquake,the bridge pier will suffer from larger seismic load,thus result in uneconomical design.Aimed at the above-mentioned problem,the elasticl-plastic isolation and energy dissipation device was proposed to do the seismic isolation design on the long-span continuous girder bridge in strong earthquake area.The calculation shows that by setting parameters about yield force and post-yielding stiffness ratio,the elastic-plastic isolation and energy dissipation device can significantly reduce seismic force exerted on the fixed pier and improve the seismic performance of the bridge structure.A ductility-based seismic design of the piers was then conducted,and a parametric study was implemented to analyze and compare the effect factor of the ductility.The results show that(1) the bending moment on the bottom of fixed pier can be greatly decreased by considering its ductility;(2)stirrup ratio and axial compression ratio have large influence on ductile coefficient;(3)cross-section yield and ultimate curvatures decrease as longitudinal reinforcement ratio decreases,and the impact of longitudinal reinforcement ratio on ductility is small.
If the fixed pot bearing and pier of long-span continuous bridge are reinforced to ensure the structure safety under strong earthquake,the bridge pier will suffer from larger seismic load,thus result in uneconomical design.Aimed at the above-mentioned problem,the elasticl-plastic isolation and energy dissipation device was proposed to do the seismic isolation design on the long-span continuous girder bridge in strong earthquake area.The calculation shows that by setting parameters about yield force and post-yielding stiffness ratio,the elastic-plastic isolation and energy dissipation device can significantly reduce seismic force exerted on the fixed pier and improve the seismic performance of the bridge structure.A ductility-based seismic design of the piers was then conducted,and a parametric study was implemented to analyze and compare the effect factor of the ductility.The results show that(1) the bending moment on the bottom of fixed pier can be greatly decreased by considering its ductility;(2)stirrup ratio and axial compression ratio have large influence on ductile coefficient;(3)cross-section yield and ultimate curvatures decrease as longitudinal reinforcement ratio decreases,and the impact of longitudinal reinforcement ratio on ductility is small.
引文
[1]JTG/T B02-01-2008,公路桥梁抗震设计细则[S].JTG/T B02-01-2008,Guidelines for Seismic Design ofHighway Bridges[S].
[2]普瑞斯特雷M J N.桥梁抗震设计与加固[M].北京:人民交通出版社,1997.PRIESTLEY M J N.Seismic Design and Retrofit ofBridges[M].Beijing:China Communications Press,1997.
[3]范立础,卓卫东.桥梁延性抗震设计[M].北京:人民交通出版社,2001.FAN Lichu,ZHUO Weidong.Seismic Ductility Design forbridge[M].Beijing:China Communications Press,2001.
[4]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Lichu.Seismic Design for Highway Bridge[M].Shanghai:Tongji University Press,1997.
[5]方海,李升玉,王曙光,等.高烈度区连续梁桥的减震设计方法研究[J].地震工程与工程振动,2005,25(6):178-182.FANG Hai,LI Shengyu,WANG Shuguang,et al.Research on Earthquake-reduction Design Method ofContinuous Girder Bridges in a High-intensity EarthquakeArea[J].Earthquake Engineering and EngineeringVibration,2005,25(6):178-182.
[6]郭磊,李建中,范立础.大跨度连续梁桥减隔震设计研究[J].土木工程学报,2006,39(3):81-85.GUO Lei,LI Jianzhong,FAN Lichu.Research on SeismicIsolation Design for Long-span Continuous Bridges[J].China Civil Engineering Journal,2006,39(3):81-85.
[7]BUCKLE IG,MAYES R L.Seismic Isolation History:Application and Performance:A World Review[J].Earthquake Spectra,1990,6(2):181-201.
[8]李春凤.汶川地震桥梁灾害与延性抗震设计探讨[J].公路交通科技,2009,26(4):98-102.LI Chunfeng.Discussion on Bridge Damage in WenchuanEarthquake and Seismic Ductility Design[J].Journal ofHighway and Transportation Research and Development,2009,26,(4):98-102.
[9]王克海,李茜,韦韩.国内外延性抗震设计的比较[J].地震工程与工程振动,2006,26(3):70-73.WANG Kehai,LI Qian,WEI Han.Comparing Overseasand Inland Specifications for Ductility Seismic Design[J].Earthquake Engineering and Engineering Vibration,2006,26(3):70-73.
[10]李建中,袁万城,范立础.连续梁桥减、隔震体系的优化设计[J.]土木工程学报,1998,31(3):47-54.LI Jianzhong,YUAN Wancheng,FAN Lichu.OptimalDesign of Seismic Isolation System for Continuous Bridges[J].China Civil Engineering Journal,1998,31(3):47-54.
[11]叶爱君,胡世德,范立础.大跨度桥梁抗震设计实用方法[J].土木工程学报,2001,34(1):1-6.YE Aijun,HU Shide,FAN Lichu.A Practical Procedureof Seismic Design for Long Span Bridges[J].China CivilEngineering Journal,2001,34(1):1-6.
[12]柳春光,林皋.桥梁结构push-over方法抗震性能研究[J].大连理工大学学报,2005,45(3):692-697.LIU Chunguang,LIN Gao.Research on Push-over Methodfor Earthquake-resistant Performance of Bridge Structure[J].Journal of Dalian University of Technology,2005,45(3):692-697.
[13]李永学,刘贵位.钢筋混凝土矩形桥墩的延性抗震分析[J].公路,2010(10):20-27.LI Yongxue,LIU Guiwei.Anti-seismic Analysis ofDuctility of Reinforced Concrete Bridge Piers withRectangle Section[J].Highway,2010(10):20-27.
[14]贡金鑫,张勤,王雪婷.从汶川地震中桥梁震害看现行国内外桥梁抗震设计方法(二)[J].公路交通科技,2010,27(10):35-52.GONG Jinxin,ZHANG Qin,WANG Xueting.Comparative Study on Bridge Seismic Design Approachesin Different Specifications Based on Survey of Disaster inWenchuan Earthquake(2)[J].Journal of Highway andTransportation Research and Development,2010,27(10):35-52.
[15]苏虹,胡世德.连续梁桥的抗震性能分析[J].结构工程师,2002(2):36-40.SU Hong,HU Shide.Seismic Analysis of the ContinuousBeam Bridge[J].Structure Engineers,2002(2):36-40.
[2]普瑞斯特雷M J N.桥梁抗震设计与加固[M].北京:人民交通出版社,1997.PRIESTLEY M J N.Seismic Design and Retrofit ofBridges[M].Beijing:China Communications Press,1997.
[3]范立础,卓卫东.桥梁延性抗震设计[M].北京:人民交通出版社,2001.FAN Lichu,ZHUO Weidong.Seismic Ductility Design forbridge[M].Beijing:China Communications Press,2001.
[4]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Lichu.Seismic Design for Highway Bridge[M].Shanghai:Tongji University Press,1997.
[5]方海,李升玉,王曙光,等.高烈度区连续梁桥的减震设计方法研究[J].地震工程与工程振动,2005,25(6):178-182.FANG Hai,LI Shengyu,WANG Shuguang,et al.Research on Earthquake-reduction Design Method ofContinuous Girder Bridges in a High-intensity EarthquakeArea[J].Earthquake Engineering and EngineeringVibration,2005,25(6):178-182.
[6]郭磊,李建中,范立础.大跨度连续梁桥减隔震设计研究[J].土木工程学报,2006,39(3):81-85.GUO Lei,LI Jianzhong,FAN Lichu.Research on SeismicIsolation Design for Long-span Continuous Bridges[J].China Civil Engineering Journal,2006,39(3):81-85.
[7]BUCKLE IG,MAYES R L.Seismic Isolation History:Application and Performance:A World Review[J].Earthquake Spectra,1990,6(2):181-201.
[8]李春凤.汶川地震桥梁灾害与延性抗震设计探讨[J].公路交通科技,2009,26(4):98-102.LI Chunfeng.Discussion on Bridge Damage in WenchuanEarthquake and Seismic Ductility Design[J].Journal ofHighway and Transportation Research and Development,2009,26,(4):98-102.
[9]王克海,李茜,韦韩.国内外延性抗震设计的比较[J].地震工程与工程振动,2006,26(3):70-73.WANG Kehai,LI Qian,WEI Han.Comparing Overseasand Inland Specifications for Ductility Seismic Design[J].Earthquake Engineering and Engineering Vibration,2006,26(3):70-73.
[10]李建中,袁万城,范立础.连续梁桥减、隔震体系的优化设计[J.]土木工程学报,1998,31(3):47-54.LI Jianzhong,YUAN Wancheng,FAN Lichu.OptimalDesign of Seismic Isolation System for Continuous Bridges[J].China Civil Engineering Journal,1998,31(3):47-54.
[11]叶爱君,胡世德,范立础.大跨度桥梁抗震设计实用方法[J].土木工程学报,2001,34(1):1-6.YE Aijun,HU Shide,FAN Lichu.A Practical Procedureof Seismic Design for Long Span Bridges[J].China CivilEngineering Journal,2001,34(1):1-6.
[12]柳春光,林皋.桥梁结构push-over方法抗震性能研究[J].大连理工大学学报,2005,45(3):692-697.LIU Chunguang,LIN Gao.Research on Push-over Methodfor Earthquake-resistant Performance of Bridge Structure[J].Journal of Dalian University of Technology,2005,45(3):692-697.
[13]李永学,刘贵位.钢筋混凝土矩形桥墩的延性抗震分析[J].公路,2010(10):20-27.LI Yongxue,LIU Guiwei.Anti-seismic Analysis ofDuctility of Reinforced Concrete Bridge Piers withRectangle Section[J].Highway,2010(10):20-27.
[14]贡金鑫,张勤,王雪婷.从汶川地震中桥梁震害看现行国内外桥梁抗震设计方法(二)[J].公路交通科技,2010,27(10):35-52.GONG Jinxin,ZHANG Qin,WANG Xueting.Comparative Study on Bridge Seismic Design Approachesin Different Specifications Based on Survey of Disaster inWenchuan Earthquake(2)[J].Journal of Highway andTransportation Research and Development,2010,27(10):35-52.
[15]苏虹,胡世德.连续梁桥的抗震性能分析[J].结构工程师,2002(2):36-40.SU Hong,HU Shide.Seismic Analysis of the ContinuousBeam Bridge[J].Structure Engineers,2002(2):36-40.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心