多遇地震下少筋混凝土重力式桥墩验算指标研究
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摘要
研究目的:我国高速铁路桥梁广泛采用少筋混凝土重力式桥墩,但现行震规对这种结构在多遇地震作用下如何验算缺少相应的研究。本文以32 m简支梁桥圆端型桥墩为研究对象,针对此问题讨论如何利用偏心及应力指标进行验算,讨论少量纵向主筋对提高重力式桥墩承载能力及稳定性的作用。研究结论:(1)对少筋混凝土重力式桥墩,可采用容许应力法或偏心进行验算;(2)采用容许应力法验算可保证墩身的截面强度及整体倾覆稳定性;(3)采用偏心验算少筋混凝土桥墩时,容许偏心值随配筋率不同而不同;(4)对于配筋率为0.1%、0.2%、0.3%及0.4%的圆端型桥墩,容许偏心可分别放宽至0.90S、1.0S、1.1S、1.2S;(5)本研究结果可为多遇地震下少筋混凝土重力式桥墩的验算方法提供理论依据。
Research purposes:Concrete gravity type piers with low longitudinal reinforcement ratio are extensively used in high- speed railway in China.However,how to check such structures is not specified in current technical codes.With the round end pier of 32 m simply- supported girder bridge as research subject,how to check the structures by eccentricity and stress indexes is studied.The effect of longitudinal reinforcement on improving the bearing capacity and stability of the pier is discussed.Research conclusions:(1) The allowable stress approach or section eccentricity could be used to check concrete gravity type piers with low longitudinal reinforcement ratio.Strength and stability of the pier can be ensured when the allowable stress approach is used.(2) When section eccentricity is used as checking index,the restriction values may vary from longitudinal reinforcement ratio.(3) For the round end piers with longitudinal reinforcement ratio of 0.1%,0.2%,0.3%and 0.4%,permissible eccentricity can be magnified to corresponding values for 0.90 S,1.0S,1.1S,1.2S.(4) The results can provide a theoretical basis for calculation method of the concrete gravity type pier with low longitudinal reinforcement ratio under low- level earthquakes.
Research purposes:Concrete gravity type piers with low longitudinal reinforcement ratio are extensively used in high- speed railway in China.However,how to check such structures is not specified in current technical codes.With the round end pier of 32 m simply- supported girder bridge as research subject,how to check the structures by eccentricity and stress indexes is studied.The effect of longitudinal reinforcement on improving the bearing capacity and stability of the pier is discussed.Research conclusions:(1) The allowable stress approach or section eccentricity could be used to check concrete gravity type piers with low longitudinal reinforcement ratio.Strength and stability of the pier can be ensured when the allowable stress approach is used.(2) When section eccentricity is used as checking index,the restriction values may vary from longitudinal reinforcement ratio.(3) For the round end piers with longitudinal reinforcement ratio of 0.1%,0.2%,0.3%and 0.4%,permissible eccentricity can be magnified to corresponding values for 0.90 S,1.0S,1.1S,1.2S.(4) The results can provide a theoretical basis for calculation method of the concrete gravity type pier with low longitudinal reinforcement ratio under low- level earthquakes.
引文
[1]孙树礼.高速铁路桥梁设计与实践[M].北京:中国铁道出版社,2011.Sun Shuli.Design and Practice of High Speed Railway Bridges[M].Beijing:China Railway Publishing House,2011.
[2]郑健.中国高速铁路桥梁[M].北京:高等教育出版社,2001.Zheng Jian.China High Speed Railway Bridges[M].Beijing:Higher Education Press,2001.
[3]GB 50111—2006,铁路工程抗震设计规范[S].GB 50111—2006,Code for Seismic Design of Railway Engineering[S].
[4]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.Ductility Seismic Design of Bridge[M].Beijing:China Communications Press,2001.
[5]谢楠,陈英俊.铁路桥墩延性抗震设计问题[J].铁道标准设计,2001(3):8-10.Xie Nan,Chen Yingjun.Ductility Seismic Design Issues about Railway Piers[J].Railway Standard Design,2001(3):8-10.
[6]刘庆华,阎贵平,陈英俊.低配筋混凝土桥墩抗震性能的实验研究[J].北方交通大学学报,1996(5):517-521.Liu Qinghua,Yan Guiping,Chen Yingjun.Experimental Studies on Seismic Behaviour of Reinforced Concrete Bridge Piers[J].Journal of Northern Jiaotong University,1996(5):517-521.
[7]鞠彦忠,阎贵平,刘林.低配筋大比例尺圆端型桥墩抗震性能的试验研究[J].土木工程学报,2003(11):65-69.Ju Yanzhong,Yan Guiping,Liu Lin.Experimental Study on Seismic Behaviours of Large-Scale RC RoundEnded Piers with Low Reinforcement Ratio[J].China Civil Engineering Journal,2003(11):65-69.
[8]蒋丽忠,邵光强,姜静静,等.高速铁路圆端形实体桥墩抗震性能试验研究[J].土木工程学报,2013(3):86-95.Jiang Lizhong,Shao Guangqiang,Jiang Jingjing,etc.Experimental Study on Seismic Performance of Solid Piers with Round Ended Cross-section in High-speed Railway[J].China Civil Engineering Journal,2013(3):86-95.
[9]李秉南,戴航,张继文.圆端形铁路桥墩变形能力分析方法研究[J].铁道工程学报,2014(3):76-81.Li Bingnan,Dai Hang,Zhang Jiwen.Study on Deformation Capacity Analysis Method of Roundended Railway Bridge Piers[J].Journal of Railway Engineering Society,2014(3):76-81.
[10]孙志浩.高地震区双线圆端形桥墩计算研究[J].工程建设与设计,2012(5):170-172.Sun Zhihao.Calculation of Doublet Round-ended Pier in Active Seismic Region[J].Construction&Design for Project,2012(5):170-172.
[2]郑健.中国高速铁路桥梁[M].北京:高等教育出版社,2001.Zheng Jian.China High Speed Railway Bridges[M].Beijing:Higher Education Press,2001.
[3]GB 50111—2006,铁路工程抗震设计规范[S].GB 50111—2006,Code for Seismic Design of Railway Engineering[S].
[4]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.Ductility Seismic Design of Bridge[M].Beijing:China Communications Press,2001.
[5]谢楠,陈英俊.铁路桥墩延性抗震设计问题[J].铁道标准设计,2001(3):8-10.Xie Nan,Chen Yingjun.Ductility Seismic Design Issues about Railway Piers[J].Railway Standard Design,2001(3):8-10.
[6]刘庆华,阎贵平,陈英俊.低配筋混凝土桥墩抗震性能的实验研究[J].北方交通大学学报,1996(5):517-521.Liu Qinghua,Yan Guiping,Chen Yingjun.Experimental Studies on Seismic Behaviour of Reinforced Concrete Bridge Piers[J].Journal of Northern Jiaotong University,1996(5):517-521.
[7]鞠彦忠,阎贵平,刘林.低配筋大比例尺圆端型桥墩抗震性能的试验研究[J].土木工程学报,2003(11):65-69.Ju Yanzhong,Yan Guiping,Liu Lin.Experimental Study on Seismic Behaviours of Large-Scale RC RoundEnded Piers with Low Reinforcement Ratio[J].China Civil Engineering Journal,2003(11):65-69.
[8]蒋丽忠,邵光强,姜静静,等.高速铁路圆端形实体桥墩抗震性能试验研究[J].土木工程学报,2013(3):86-95.Jiang Lizhong,Shao Guangqiang,Jiang Jingjing,etc.Experimental Study on Seismic Performance of Solid Piers with Round Ended Cross-section in High-speed Railway[J].China Civil Engineering Journal,2013(3):86-95.
[9]李秉南,戴航,张继文.圆端形铁路桥墩变形能力分析方法研究[J].铁道工程学报,2014(3):76-81.Li Bingnan,Dai Hang,Zhang Jiwen.Study on Deformation Capacity Analysis Method of Roundended Railway Bridge Piers[J].Journal of Railway Engineering Society,2014(3):76-81.
[10]孙志浩.高地震区双线圆端形桥墩计算研究[J].工程建设与设计,2012(5):170-172.Sun Zhihao.Calculation of Doublet Round-ended Pier in Active Seismic Region[J].Construction&Design for Project,2012(5):170-172.
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