高速铁路连续梁高桩承台的动力性能影响分析
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摘要
结合合福铁路古田溪特大桥主跨(60+2×100+60)m连续梁设计方案,分别建立了相应的空间有限元模型,对比分析了3种模型的自振特性。采用桥梁结构动力分析程序BDAPV2.0进行车桥动力仿真,针对高桩承台以及桩-土相互作用对桥梁和车辆的振动性能的影响进行了研究。对比分析表明:高桩承台及桩-土相互作用使桥梁结构的自振频率降低,且不同模型下,桥梁跨中和墩顶的横向位移和加速度也有差异;考虑桩-土相互作用的全桩模型能比较真实地反映车辆荷载作用下桥梁的横向振动特性,而采用墩底固结模型进行动力仿真分析会产生较大误差。
Combined with the design schemes for the main span (60+2×100+60) m continuous beam of Gutianxi Bridge on Hefei-Fuzhou railway, the corresponding spatial finite element models are established and the vibration characteristics of the models are comparatively analyzed. Moreover, the bridge structure dynamic analysis program BDAP V2.0 is used to simulate train-bridge dynamic performance and analyze the influence of high-rise pile cap and pile-soil interaction on the vibration performance of bridge and train. Comparative analysis shows that high-rise pile cap and pile-soil interaction can drop natural frequency of the bridge structure and the transverse displacement and acceleration in the middle of span and on the top of pier have significant differences under three models. The whole pile model considering pile-soil interaction can truly reflect transverse vibration performance of the bridge under train loads, while dynamic simulation with the pier bottom consolidation model will produce a great error.
Combined with the design schemes for the main span (60+2×100+60) m continuous beam of Gutianxi Bridge on Hefei-Fuzhou railway, the corresponding spatial finite element models are established and the vibration characteristics of the models are comparatively analyzed. Moreover, the bridge structure dynamic analysis program BDAP V2.0 is used to simulate train-bridge dynamic performance and analyze the influence of high-rise pile cap and pile-soil interaction on the vibration performance of bridge and train. Comparative analysis shows that high-rise pile cap and pile-soil interaction can drop natural frequency of the bridge structure and the transverse displacement and acceleration in the middle of span and on the top of pier have significant differences under three models. The whole pile model considering pile-soil interaction can truly reflect transverse vibration performance of the bridge under train loads, while dynamic simulation with the pier bottom consolidation model will produce a great error.
引文
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[2]MURAT D.Integral Abutment-backfill Behavior on Sand Soil-push-over Analysis Approach[J].Journal of Bridge Engineering,2005(3):354-364.
[3]RODRIGUEZ SANTIAGO,DONIKIAN ROUPEN,INGHAM TIM J,et al.Seismic Analysis of Bridges with Pile Foundations[J].Comput-ers and Structures,1999(1-3):49-62.
[4]孙剑平.桩自由长度对高桩承台桥墩地震反应的影响[J].北方交通大学学报,1999(1):1-5.Sun Jianping.Seismic Response Influence of Pier with Elevated Pile Foundation due to the Unconstrained Length[J].Journal of Northern Jiaotong University,1999(1):1-5.
[5]鲁鹏.群桩基础的群桩效应研究[J].山西建筑,2011(32):49-50.Lu Peng.Research on Pile Group Effect of Pile Group Foundation[J].Shanxi Architecture.2011(32):49-50.
[6]周敉,袁万城,张玥.高桩承台基础群桩等效嵌固长度参数分析[J].长安大学学报(自然科学版),2010(3):47-52.Zhou Mi,Yuan Wan-cheng,Zhang Yue.Parameter Sensitivity A-nalysis of Equivalent Anchorage Length for Elevated Pile Caps[J].Journal of Chang An University(Natural Science Edition),2010(3):47-52.
[7]李小珍,刘孝寒,刘德军.考虑桩-土相互作用的连续刚构桥车桥耦合振动分析[J].振动与冲击,2011(12):54-58.Li Xiaozhen,Liu Xiaohan,Liu Dejun.Coupled Vibration Analysis of a Railway Continuous Rigid-frame Bridge and Vehicles with Soil-structure Interaction[J].Journal of Vibration and Shock,2011(12):54-58.
[8]刘晶波,杜修力.结构动力学[M].北京:机械工业出版社,2005.Liu Jingbo,Du Xiuli.Structural Dynamics[M].Beijing:Mechanical Industry Press,2005.
[9]边学成.高速铁路荷载作用下高架桥和地基振动分析[J].振动工程学报,2006(4):438-445.Bian Xuecheng.Analysis of Viaduct-ground Vibrations due to High-speed Train Moving Loads[J].Journal of Vibration Engineering,2006(4):438-445.
[10]李运生,严贵平,王元清,等.铁路桥梁梁墩体系墩顶横向振幅的参数[J].铁道建筑,2007(3):21-24.Li Yunsheng,YAN Guiping,WANG Yuanqing,et al.Parameters of Transverse Amplitude of Pier and Beam Body and Pier Top of Rail-way Bridge[J].Railway Engineering,2007(3):21-24.
[11]翟婉明.车辆-轨道耦合动力学[M].北京:中国铁道出版社,1997.Zhai Wanming.Vehicle-Track Coupling Dynamics[M].Beijing:China Railway Publishing House,1997.
[12]毕玉琢.宜万铁路特殊结构桥梁动力特性及列车走行性分析[J].铁道科学与工程学报,2006(6):69-73.BI Yuzuo.Dynamic Characteristic and Train Running Performance of Particular Bridges on Yiwan Railway Line[J].Journal of Railway Science and Engineering,2006(6):69-73.
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