铁路圆端形空心墩振动台试验研究
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摘要
研究目的:圆端形空心高墩的试验研究对于铁路桥梁抗震设计理论的发展至关重要,因此本文以配箍率为设计变量,设计3个缩尺比为1/6的圆端形截面空心高墩试件,通过大型振动台试验结果的对比分析,研究圆端形铁路空心高墩的抗震性能,分析多遇、设计和罕遇地震下空心墩的开裂行为、加速度和位移反应、位移延性系数。研究结论:(1)试验桥墩均以弯曲破坏为主,水平向裂缝遍布墩身,侧向斜裂缝不明显;(2)墩底实心与空心过渡段截面为受力最不利位置,在抗震构造设计中应尤其注意;(3)加大箍筋用量可以改善桥墩位移延性,提高桥墩抗震能力;(4)本研究成果可应用于铁路桥墩抗震设计及方法研究领域。
Research purposes: The research on hollow high piers is very important for the development of seismic design theory for mountainous high-speed railway bridges. The author designed three round-end hollow high piers with a scale ratio of 1/6. A comparative analysis on large-scale shaking table tests was conducted to study the seismic performance of railway piers with different stirrup ratios. The cracking behaviors,acceleration,displacement response and ductile coefficient of pier are analyzed under frequent,design and rare earthquake.Research conclusions:( 1) The piers suffered bending failure,that the horizontal cracks are regularly all over the piers and the diagonal cracks are not obvious;( 2) The transition section of solid and hollow at the bottom of the pier is the most unfavorable seismic position,and special attention should be paid on seismic detail design;( 3) The displacement ductility and seismic resistance of a pier could be upgraded by increasing the quantity of stirrup;( 4) The research result can be applied to the seismic design and research field of railway bridge piers.
Research purposes: The research on hollow high piers is very important for the development of seismic design theory for mountainous high-speed railway bridges. The author designed three round-end hollow high piers with a scale ratio of 1/6. A comparative analysis on large-scale shaking table tests was conducted to study the seismic performance of railway piers with different stirrup ratios. The cracking behaviors,acceleration,displacement response and ductile coefficient of pier are analyzed under frequent,design and rare earthquake.Research conclusions:( 1) The piers suffered bending failure,that the horizontal cracks are regularly all over the piers and the diagonal cracks are not obvious;( 2) The transition section of solid and hollow at the bottom of the pier is the most unfavorable seismic position,and special attention should be paid on seismic detail design;( 3) The displacement ductility and seismic resistance of a pier could be upgraded by increasing the quantity of stirrup;( 4) The research result can be applied to the seismic design and research field of railway bridge piers.
引文
[1] Laplace P.,Sanders D.,Saiidi M. S.,etc. Shake Table Testing of Flexure Dominated Reinforced Concrete Bridge Columns[R]. California:California Department of Transportation Sacramento,1999.
[2]王欢.配筋率对高速铁路圆端形实心桥墩地震响应影响研究[D].长沙:中南大学,2014.Wang Huan. Influence of Reinforcement Ratio on Seismic Response of Round-ended Bridge Piers in High Speed Railway[D]. Changsha:Central South University,2014.
[3]彭凯,李建中,朱宇,等.独柱双层高架桥墩柱振动台试验研究Ⅱ:结构地震反应[J].重庆交通大学学报:自然科学版,2009(4):646-657.Peng Kai,Li Jianzhong,Zhu Yu,etc. Shaking Table Test of Single-Column-Bent Double-Deck Viaduct Pier Model-Ⅱ:Structural Seismic Response[J].Journal of Chongqing Jiaotong University:Natural Science,2009(4):646-657.
[4] Sakai J., Unjoh S. Shake Table Experiment on Circular Reinforced Concrete Bridge Column under Multidirectional Seismic Excitation[A]. Structural Engineering Research Frontiers,2006,1-12.
[5]温留汉·黑沙,邹爽,周福霖,等.高速铁路梁桥减隔震研究[J].铁道工程学报,2017(7):47-52.Wenliuhan·Heisha, Zou Shuang, Zhou Fulin,etc.Research on the Seismic Isolation of High-speed Railway Bridges[J]. Journal of Railway Engineering Society,2017(7):47-52.
[6] 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].
[7]王东升,李宏男,赵颖华,等.钢筋混凝土桥墩基于位移的抗震设计方法[J].土木工程学报,2006(10):80-86.Wang Dongsheng,Li Hongnan,Zhao Yinghua,etc.Displacement-based Seismic Design Method for Reinforced Concrete Bridge Piers[J]. China Civil Engineering Journal,2006(10):80-86.
[8]司炳君,李宏男,王东升,等.基于位移设计的钢筋混凝土桥墩抗震性能试验研究(Ⅰ):拟静力试验[J].地震工程与工程振动,2008(1):123-129.Si Bingjun, Li Hongnan, Wang Dongsheng, etc.Displacement-based Design of Reinforced Concrete Bridges for Seismic Performance Tests[J]. Earthquake Engineering and Engineering Vibration,2008(1):123-129.
[2]王欢.配筋率对高速铁路圆端形实心桥墩地震响应影响研究[D].长沙:中南大学,2014.Wang Huan. Influence of Reinforcement Ratio on Seismic Response of Round-ended Bridge Piers in High Speed Railway[D]. Changsha:Central South University,2014.
[3]彭凯,李建中,朱宇,等.独柱双层高架桥墩柱振动台试验研究Ⅱ:结构地震反应[J].重庆交通大学学报:自然科学版,2009(4):646-657.Peng Kai,Li Jianzhong,Zhu Yu,etc. Shaking Table Test of Single-Column-Bent Double-Deck Viaduct Pier Model-Ⅱ:Structural Seismic Response[J].Journal of Chongqing Jiaotong University:Natural Science,2009(4):646-657.
[4] Sakai J., Unjoh S. Shake Table Experiment on Circular Reinforced Concrete Bridge Column under Multidirectional Seismic Excitation[A]. Structural Engineering Research Frontiers,2006,1-12.
[5]温留汉·黑沙,邹爽,周福霖,等.高速铁路梁桥减隔震研究[J].铁道工程学报,2017(7):47-52.Wenliuhan·Heisha, Zou Shuang, Zhou Fulin,etc.Research on the Seismic Isolation of High-speed Railway Bridges[J]. Journal of Railway Engineering Society,2017(7):47-52.
[6] 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].
[7]王东升,李宏男,赵颖华,等.钢筋混凝土桥墩基于位移的抗震设计方法[J].土木工程学报,2006(10):80-86.Wang Dongsheng,Li Hongnan,Zhao Yinghua,etc.Displacement-based Seismic Design Method for Reinforced Concrete Bridge Piers[J]. China Civil Engineering Journal,2006(10):80-86.
[8]司炳君,李宏男,王东升,等.基于位移设计的钢筋混凝土桥墩抗震性能试验研究(Ⅰ):拟静力试验[J].地震工程与工程振动,2008(1):123-129.Si Bingjun, Li Hongnan, Wang Dongsheng, etc.Displacement-based Design of Reinforced Concrete Bridges for Seismic Performance Tests[J]. Earthquake Engineering and Engineering Vibration,2008(1):123-129.