墩高对连续梁桥抗震性能的影响
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摘要
以南水北调中线工程中某预应力混凝土连续梁桥为例,采用有限元程序MIDAS建立了考虑和不考虑桩土作用的两种有限元计算模型,选取5,10,15,20,25 m等5个墩身高度,采用反应谱分析法,分析在顺桥向及横桥向地震输入下不同墩身高度对结构的自振周期、制动墩和非制动墩的墩顶位移、墩底内力、墩顶内力的影响规律,以及桩土作用效应随墩身高度的变化规律,可为同类桥梁结构的抗震设计提供理论依据.
Taking the pre-stressed concrete continuous-beam bridge in the Central Project of South-to-north Water Transfer Engineering as an example,two finite element numerical models were built considering and without considering the influence of pile-soil action.The 5 different pier heights of 5 m,10 m,15 m,20 m and 25 m were selected,the earthquake actions along and transverse the bridge directions were input and the response spectrum analytical method was adopted.Based on the calculation,the effects of pier height on the self-vibration period,the pier top displacements of control and un-control piers and the internal forces at pier bottom and pier top were analyzed,and the changes of pile-soil action with pier height were also discussed.The results would provide a theoretical basis for the seismic design of the similar bridges.
Taking the pre-stressed concrete continuous-beam bridge in the Central Project of South-to-north Water Transfer Engineering as an example,two finite element numerical models were built considering and without considering the influence of pile-soil action.The 5 different pier heights of 5 m,10 m,15 m,20 m and 25 m were selected,the earthquake actions along and transverse the bridge directions were input and the response spectrum analytical method was adopted.Based on the calculation,the effects of pier height on the self-vibration period,the pier top displacements of control and un-control piers and the internal forces at pier bottom and pier top were analyzed,and the changes of pile-soil action with pier height were also discussed.The results would provide a theoretical basis for the seismic design of the similar bridges.
引文
[1]陈卫国.南水北调中线总干渠京石段交通恢复及桥型方案设计优化[J].水科学与工程技术,2009(4):13-16.
[2]陈厚群.南水北调工程抗震安全性问题[J].中国水利水电科学研究院学报,2003(1):17-22.
[3]贾贤盛.不同墩高桥墩结构的地震反应分析[J].交通科技,2011(247):8-10.
[4]安瑞晶,宋一凡.墩高及跨径对连续梁桥地震响应的影响分析[C]∥中国公路学会桥梁和结构工程分会.2004年全国桥梁学术会议论文集.北京:人民交通出版社,2004.
[5]张世敏.预应力混凝土连续梁桥静力分析及抗震研究[D].郑州:华北水利水电学院,2012.
[6]重庆交通科研设计院.JTG/T B02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[7]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[2]陈厚群.南水北调工程抗震安全性问题[J].中国水利水电科学研究院学报,2003(1):17-22.
[3]贾贤盛.不同墩高桥墩结构的地震反应分析[J].交通科技,2011(247):8-10.
[4]安瑞晶,宋一凡.墩高及跨径对连续梁桥地震响应的影响分析[C]∥中国公路学会桥梁和结构工程分会.2004年全国桥梁学术会议论文集.北京:人民交通出版社,2004.
[5]张世敏.预应力混凝土连续梁桥静力分析及抗震研究[D].郑州:华北水利水电学院,2012.
[6]重庆交通科研设计院.JTG/T B02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[7]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
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