考虑地基柔性和侧向力分布模式的桥墩推倒分析
|
摘要
考虑地基柔性的影响,使用SAP2000有限元程序分别建立了墩底固结和墩底六弹簧约束的桥墩模型,采用均匀加速度、第一阶振型和前三阶振型组合等3种水平侧向力加载模式分别对模型进行了推倒分析,并对比分析了不同墩高对计算结果的影响。通过对模型动力特性和推倒分析结果的对比分析表明,地基柔性不但延长了桥墩的自振周期,还对其振型和推倒曲线有着重要影响;对梁式桥梁结构进行推倒分析时不宜采用一阶模态向量分布加载模式;对于墩高较低、由第一阶振型控制的桥墩可采用均匀加速度和按一阶振型计算出的水平地震力分布模式进行推倒分析,墩高较高时,采用振型组合的加载模式更为合理。
Considering the influence of foundation flexible,two sorts of pier model with various bottom constraints are established using SAP2000 finite element program.One model is fixed in the bottom and the other is restrained with six springs.Three different lateral load patterns,such as uniform acceleration,the first order mode and combination of top three modes are adopted in pushover analysis.The influence of different height of the pier on the calculated results is analyzed.The comparative analysis results show that flexible foundation not only extends the natural vibration period but also affects the vibration model and pushover curve notably.Using the first order mode is not recommended in pushover analysis for girder-type bridge structures.Uniform acceleration and the first mode of horizontal seismic force patterns can be used in pushover analysis for lower piers.And it is more reasonable to use multi-mode combination lateral load patterns for higher piers.
Considering the influence of foundation flexible,two sorts of pier model with various bottom constraints are established using SAP2000 finite element program.One model is fixed in the bottom and the other is restrained with six springs.Three different lateral load patterns,such as uniform acceleration,the first order mode and combination of top three modes are adopted in pushover analysis.The influence of different height of the pier on the calculated results is analyzed.The comparative analysis results show that flexible foundation not only extends the natural vibration period but also affects the vibration model and pushover curve notably.Using the first order mode is not recommended in pushover analysis for girder-type bridge structures.Uniform acceleration and the first mode of horizontal seismic force patterns can be used in pushover analysis for lower piers.And it is more reasonable to use multi-mode combination lateral load patterns for higher piers.
引文
[1]潘龙.基于推倒分析方法的桥梁结构地震损伤分析与性能设计[D].上海:同济大学,2001Pan Long.Seismic Damage Analysis and PerformanceDesign of Bridge Structure Based Pushover AnalysisMethod[D].Shanghai:Tongji University,2001(inChinese)
[2]江大绥,贺军利,张凤新.静力弹塑性分析(PushoverAnalysis)的基本原理和计算实例[J].世界地震工程,2004,20(1):45～53Wang Da-sui,He Jun-li,Zhang Feng-xin.The BasicPrinciple and a Case Study of the Static ElastoplasticAnalysis(Pushover Analysis)[J].World EarthquakeEngineering,2004,20(1):45～53(in Chinese)
[3]宗德玲.基于PUSH-OVER分析的桥梁抗震能力评估方法研究[D].南京:南京工业大学,2004,5Zong De-ling.A Method of Seismic Capacity Evaluationfor Bridges Based on Push-over Analysis[D].Nanjing:Nanjing University of Technology,2004(in Chinese)
[4]汪梦甫,周锡元.关于结构静力弹塑性分析(Push-over)方法中的几个问题[J].结构工程师,2002,(4):17～22Wang Meng-fu,Zhou Xi-yuan.Some Problems in StaticPushover Analysis of Structures[J].StructuralEngineers,2002(4):17～22(in Chinese)
[5]种迅,叶献国,吴本华.Pushover分析中侧向力分布形式的影响[J].工程力学,2001,(增刊):298～302Zhong Xun,Ye Xian-guo,Wu Ben-hua.The Influenceof Lateral Force Modes in Pushover Analysis[J].Engineering Mechanics,2001,(sup):298～302(inChinese)
[6]JTG D63-2007,公路桥涵地基与基础设计规范[S]JTG D63-2007.Code for Design of Ground Base andFoundation of Highway Bridges and Culverts[S](inChinese)
[7]熊向阳,戚震华.侧向荷载分布方式对静力弹塑性分析结果的影响[J].建筑科学,2001,17(5):8～13Xiong Xiang-yang,Qi Zhen-hua.The Influence ofLateral Load Patterns on the Results of Static PushoverAnalysis[J].Building Science,2001,17(5):8～13(in Chinese)
[8]王克海,李茜.基于模态分析的push-over方法在桥梁抗震分析中的应用[J].铁道学报,2006,28Wang Ke-hai,Li Qian.Mode-based Push-over MethodApplied to Aseismatic Analysis of Bridges[J].Journalof The China Railway Society,2006,28(in Chinese)
[9]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89～97Hou Shuang,Ou Jin-ping.A Study of Load PatternSelection of Pushover Analysis and Influence of HigherModes[J].Earthquake Engineering and EngineeringVibration,2004,24(3):89-97(in Chinese)
[10]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](in Chinese)
[2]江大绥,贺军利,张凤新.静力弹塑性分析(PushoverAnalysis)的基本原理和计算实例[J].世界地震工程,2004,20(1):45～53Wang Da-sui,He Jun-li,Zhang Feng-xin.The BasicPrinciple and a Case Study of the Static ElastoplasticAnalysis(Pushover Analysis)[J].World EarthquakeEngineering,2004,20(1):45～53(in Chinese)
[3]宗德玲.基于PUSH-OVER分析的桥梁抗震能力评估方法研究[D].南京:南京工业大学,2004,5Zong De-ling.A Method of Seismic Capacity Evaluationfor Bridges Based on Push-over Analysis[D].Nanjing:Nanjing University of Technology,2004(in Chinese)
[4]汪梦甫,周锡元.关于结构静力弹塑性分析(Push-over)方法中的几个问题[J].结构工程师,2002,(4):17～22Wang Meng-fu,Zhou Xi-yuan.Some Problems in StaticPushover Analysis of Structures[J].StructuralEngineers,2002(4):17～22(in Chinese)
[5]种迅,叶献国,吴本华.Pushover分析中侧向力分布形式的影响[J].工程力学,2001,(增刊):298～302Zhong Xun,Ye Xian-guo,Wu Ben-hua.The Influenceof Lateral Force Modes in Pushover Analysis[J].Engineering Mechanics,2001,(sup):298～302(inChinese)
[6]JTG D63-2007,公路桥涵地基与基础设计规范[S]JTG D63-2007.Code for Design of Ground Base andFoundation of Highway Bridges and Culverts[S](inChinese)
[7]熊向阳,戚震华.侧向荷载分布方式对静力弹塑性分析结果的影响[J].建筑科学,2001,17(5):8～13Xiong Xiang-yang,Qi Zhen-hua.The Influence ofLateral Load Patterns on the Results of Static PushoverAnalysis[J].Building Science,2001,17(5):8～13(in Chinese)
[8]王克海,李茜.基于模态分析的push-over方法在桥梁抗震分析中的应用[J].铁道学报,2006,28Wang Ke-hai,Li Qian.Mode-based Push-over MethodApplied to Aseismatic Analysis of Bridges[J].Journalof The China Railway Society,2006,28(in Chinese)
[9]侯爽,欧进萍.结构Pushover分析的侧向力分布及高阶振型影响[J].地震工程与工程振动,2004,24(3):89～97Hou Shuang,Ou Jin-ping.A Study of Load PatternSelection of Pushover Analysis and Influence of HigherModes[J].Earthquake Engineering and EngineeringVibration,2004,24(3):89-97(in Chinese)
[10]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](in Chinese)
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