高速铁路无砟轨道-桥梁结构动力响应试验研究
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摘要
以沪昆高铁某无砟轨道-桥梁的三孔32.0 m标准跨径预应力简支箱梁为研究对象,建立多断面多结构监测系统开展无砟轨道-桥梁结构动力响应测试,研究该无砟轨道-桥梁各结构层在不同行车速度下的动力响应规律及轨道结构-桥面协调变形特性。研究结果表明:在行车速度为290～350 km/h情况下,该预应力简支箱梁的梁体跨中竖向振动加速度随着列车行车速度的增大而增大,在行车速度320～340 km/h之间达到峰值;梁体跨中各结构层的竖向、横向加速度从上至下呈现明显的逐级减小趋势,振动衰减明显;梁体跨中及1/4跨测点竖向动位移与行车速度没有明显相关关系,振动变形满足规范要求;轨道板-底座板间相对动位移远大于底座板-桥面板间相对动位移,竖向相对动位移均大于横向相对动位移,在长期动力循环加卸载条件下,此种相对动位移可能引起较大的塑性累积变形,应予以重视。
Taking the three-hole 32.0 m standard span prestressed simply supported box girder of a ballastless track-bridge on Shanghai-Kunming high-speed railway as the research object,a multi-section and multi-structure monitoring system was established to carry out the dynamic response test of the ballastless track-bridge structure,and to study the dynamic response law and the track structure-bridge coordinate deformation characteristics of the ballastless track-bridge structural layers at different driving speeds. The results show that: the vertical vibration acceleration of the beam of the prestressed simply supported box girder increases with the increase of train speed when the traveling speed is 290～350 km/h and reaches the peak at 320～340 km/h. The vertical and lateral accelerations of each stratum structure in the beam show a progressively decreasing trend from top to bottom,and the vibration attenuation is significant. There is no obvious correlation between vertical dynamic displacement of the measured points in the mid-span and 1/4-span of the beam body and the driving speed,and vibration deformation meets the requirements of specifications. The relative dynamic displacement between the track plate and the base plate is much greater than that between the base plate and the deck plate,and the vertical relative dynamic displacement is both greater than the lateral relative dynamic displacement. Under the condition of long-term dynamic cyclic loading and unloading,this kind of relative dynamic displacement may cause large plastic cumulative deformation,which should be paid attention to.
Taking the three-hole 32.0 m standard span prestressed simply supported box girder of a ballastless track-bridge on Shanghai-Kunming high-speed railway as the research object,a multi-section and multi-structure monitoring system was established to carry out the dynamic response test of the ballastless track-bridge structure,and to study the dynamic response law and the track structure-bridge coordinate deformation characteristics of the ballastless track-bridge structural layers at different driving speeds. The results show that: the vertical vibration acceleration of the beam of the prestressed simply supported box girder increases with the increase of train speed when the traveling speed is 290～350 km/h and reaches the peak at 320～340 km/h. The vertical and lateral accelerations of each stratum structure in the beam show a progressively decreasing trend from top to bottom,and the vibration attenuation is significant. There is no obvious correlation between vertical dynamic displacement of the measured points in the mid-span and 1/4-span of the beam body and the driving speed,and vibration deformation meets the requirements of specifications. The relative dynamic displacement between the track plate and the base plate is much greater than that between the base plate and the deck plate,and the vertical relative dynamic displacement is both greater than the lateral relative dynamic displacement. Under the condition of long-term dynamic cyclic loading and unloading,this kind of relative dynamic displacement may cause large plastic cumulative deformation,which should be paid attention to.
引文
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[13]董亮,赵成刚,蔡德钩,等.高速铁路无砟轨道路基动力特性数值模拟和试验研究[J].土木工程学报,2008,41(10):81-86.DONG Liang,ZHAO Chenggang CAI Deigou,et al. Experimental validation of a numerical model for prediction of the dynamic response of ballastless subgrade of high-speed railways[J]. China Civil Engineering Journal,2008,41(10):81-86.
[2]文望青,罗世东.京沪高速铁路桥梁设计关键技术[J].铁道建筑技术,2009(2):30-39+49.WEN Wangqing,LUO Shidong. Key technology for bridge design in beijing-shanghai high-speed railway[J]. Railway Construction Technology,2009(2):30-39+49.
[3]杨岳民,潘家英.大跨度铁路桥梁车桥动力响应理论分析及试验研究[J].中国铁道科学,1995(4):1-16.YANG Yuemin,PAN Jiaying.Theoretical and experimenal studies on dynamic interaction between train and long span railway bridge[J]. China Railway Science,1995(4):1-16.
[4]HE Xia,NAN Zhang. Dynamic analysis of railway bridge under highspeed trains[J]. Computers&Structures,2005,81:2467-2478.
[5]郜新军,赵成刚,郭院成,等.地震、列车竖向荷载共同作用下大跨桥梁的动力响应分析[J].防灾减灾工程学报,2015,35(4):543-548.GAO Xinjun,ZHAO Chenggang,GUO Yuancheng,et al. Dynamic response analysis of long-span continuous bridge under cction of vertical load caused by earthquake and rrain[J]. Journal of Disaster Prevention and Mitigation Engineering,2015,35(4):543-548.
[6]盛兴旺,郑纬奇,何庭,等.厦深铁路榕江特大桥主桥车-桥耦合振动分析[J].桥梁建设,2017,47(2):66-71.SHENG Xingwang,ZHENG Weiqi,HE Ting,et al. Analysis of train-bridgecoupling vibration of main bridge of Rongjiang river bridge on Xiamen-Shenzhen railway[J]. Bridge Construction,2017,47(2):66-71.
[7]蔡超勋,刘吉元,肖祥淋,等. 30 t轴重重载货车作用下常用跨度预应力混凝土简支梁动力响应的试验分析[J].铁道建筑,2015(1):1-6.CAI Chaoxun,LIU Jiyuan,XIAO Xianglin,et al. Experimental analysis on dynamic response of common span prestressed concrete simply-supported girder under loading of 30 t axle load freight train.[J]. Railway Engineering,2015(1):1-6.
[8]黄志斌.合福高铁建溪特大桥动力响应试验研究[J].中外建筑,2017(5):218-221.HUANG Zhibin. Experimental study on the dynamic response of Jianxi creek bridge of He Fu high-speed rail[J]. Chinese and Overseas Architecture,2017(5):218-221.
[9]刘鹏辉,姚京川,尹京,等.时速200~250 km/h高速铁路桥梁动力性能试验研究[J].土木工程学报,2013(3):96-102.LIU Penghui,YAO Jingchuan,YIN Jing,et al. Experimental study on dynamic behaviors of 200~250 km/h high speed railway bridges[J]. China Civil Engineering Journa1,2013,46(3):96-102.
[10]杨宜谦,姚京川,孟鑫,等.时速300~350 km/h高速铁路桥梁动力性能试验研究[J].中国铁道科学,2013,34(3):14-19.YANG Yiqian,YAO Jingchuan,MENG Xin,et al. Experimental study on dynamic behaviors of bridges for 300~350 km/h high speed railway[J].China Railway Science,2013,34(3):14-18.
[11]张斌,雷晓燕.基于车辆-轨道单元的无砟轨道动力特性有限元分析[J].铁道学报,2011,33(7):78-85.ZHANG Bin,LEI Xiaoyan. Analysis on dynamic behavior of ballastless track based on vehicle and track elements with finite element method[J]. Journal of the China Railway Society,2011,33(7):78-85.
[12]马学宁,梁波,高峰.高速铁路板式无砟轨道-路基结构动力特性研究[J].铁道学报,2011,33(2):72-78.MA Xuening, LIANG Bo, GAO Feng. Study on the dynamic properties of slab ballastless track and subgrade structure on highspeed railway[J]. Journal of the China Railway Society,2011,33(2):72-78.
[13]董亮,赵成刚,蔡德钩,等.高速铁路无砟轨道路基动力特性数值模拟和试验研究[J].土木工程学报,2008,41(10):81-86.DONG Liang,ZHAO Chenggang CAI Deigou,et al. Experimental validation of a numerical model for prediction of the dynamic response of ballastless subgrade of high-speed railways[J]. China Civil Engineering Journal,2008,41(10):81-86.