复杂地形条件下桥上CRTSⅡ型轨道系统地震响应
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摘要
为了研究复杂地形对桥上CRTSⅡ型轨道系统地震响应的影响,以沪昆高速铁路线16~32m简支梁桥为例,考虑钢轨、扣件、轨道板、砂浆层、底座板、滑动层、桥梁、固结机构、端刺与挡块等部件,建立了多跨简支梁桥-双线CRTSⅡ型轨道系统非线性动力学仿真模型,研究了桥上CRTSⅡ型轨道系统纵向力分布特征;设置了4种典型地形工况,分析了不同墩高条件下桥上CRTSⅡ型轨道系统地震响应规律。分析结果表明:与非纵连轨道结构相比,桥上CRTSⅡ型轨道结构最大钢轨应力相对较小,约为138.8MPa,应力包络曲线呈反对称,线形平滑;轨道板和底座板共同承受纵向力,其最大值均出现在桥台附近,最大拉应力分别达到25.2、27.1 MPa,将在地震中发生开裂;在地震中,端刺承受着巨大的纵向力,可达14~20 MN;底座板与桥面之间相对位移超过24mm,对系统有隔震耗能作用;地形对钢轨、轨道板和底座板纵向力的影响约为30%左右,对墩底剪力影响较大,在地形发生突变处,墩底剪力增幅达4倍;靠近桥台处的滑动层横向变形较大,可达2.7mm,随着墩高增大,扣件与滑动层纵横竖变形增大;在地震作用下,滑动层普遍存在着较大的竖向变形,桥台附近滑动层竖向变形可达43.5mm;在地震中,挡块与底座板之间存在着频繁的碰撞现象,桥台附近挡块碰撞力可达38 MPa,挡块将发生损坏。
To study the effect of complex geographies on the seismic responses of CRTS II track system on bridge,the 16-32 msimply supported bridge on the Shanghai-Kunming High-Speed Railway was taken as an example,the nonlinear dynamics simulation model of multispan simply supported bridge and double CRTS Ⅱ track system was established based on considering rail,fastener,track plate,mortar layer,base plate,sliding layer,bridge,consolidation mechanism,terminal spine,check block and other parts,and the longitudinal force distribution characteristicsof CRTS II track system on the bridge were studied.Four kinds of typical geography conditions were set to study the seismic response rules of CRTS Ⅱ track system on the bridge.Research result shows that compared with the non-longitudinal continuous track structures,the maximum track stress of CRTS Ⅱtrack structure on the bridge is relatively smaller and about 138.8 MPa,and its stress envelope curve is antisymmetric and more smooth.Track plate and base plate together bear longitudinal forces,and their maximum values are near the bridge abutment and are25.2 MPa and 27.1 MPa,respectively,which can result in cracking during the earthquake.The terminal spine bears huge longitudinal force that can reach 14-20 MN.During earthquake,a greatly relative displacement more than 24 mm occurs between base plate and bridge deck,which has the effect of seismic isolation and energy consumption.The geography conditions have 30%influence on the longitudinal stresses of rail,track plate and base plate,while have greater influence on the shear force at the pier bottom.The shear force at the pier bottom increases 4 times where the terrain(pier height)mutates.The lateral deformation of sliding layer near the abutment is larger and can reach to 2.7 mm.With the increase of pier height,the longitudinal,lateral and vertical deformations of fastener and sliding layer increase.The sliding layer generally has larger vertical deformation that can reach 43.5 mm near the abutment.In the earthquake,there is frequent collision between check block and base plate,and the collision force near the abutment is more than 38 MPa that can cause the damage of check block.
To study the effect of complex geographies on the seismic responses of CRTS II track system on bridge,the 16-32 msimply supported bridge on the Shanghai-Kunming High-Speed Railway was taken as an example,the nonlinear dynamics simulation model of multispan simply supported bridge and double CRTS Ⅱ track system was established based on considering rail,fastener,track plate,mortar layer,base plate,sliding layer,bridge,consolidation mechanism,terminal spine,check block and other parts,and the longitudinal force distribution characteristicsof CRTS II track system on the bridge were studied.Four kinds of typical geography conditions were set to study the seismic response rules of CRTS Ⅱ track system on the bridge.Research result shows that compared with the non-longitudinal continuous track structures,the maximum track stress of CRTS Ⅱtrack structure on the bridge is relatively smaller and about 138.8 MPa,and its stress envelope curve is antisymmetric and more smooth.Track plate and base plate together bear longitudinal forces,and their maximum values are near the bridge abutment and are25.2 MPa and 27.1 MPa,respectively,which can result in cracking during the earthquake.The terminal spine bears huge longitudinal force that can reach 14-20 MN.During earthquake,a greatly relative displacement more than 24 mm occurs between base plate and bridge deck,which has the effect of seismic isolation and energy consumption.The geography conditions have 30%influence on the longitudinal stresses of rail,track plate and base plate,while have greater influence on the shear force at the pier bottom.The shear force at the pier bottom increases 4 times where the terrain(pier height)mutates.The lateral deformation of sliding layer near the abutment is larger and can reach to 2.7 mm.With the increase of pier height,the longitudinal,lateral and vertical deformations of fastener and sliding layer increase.The sliding layer generally has larger vertical deformation that can reach 43.5 mm near the abutment.In the earthquake,there is frequent collision between check block and base plate,and the collision force near the abutment is more than 38 MPa that can cause the damage of check block.
引文
[1]徐庆元,张旭久.高速铁路博格纵连板桥上无砟轨道纵向力学特性[J].中南大学学报:自然科学版,2009,40(2):526-532.XU Qing-yuan,ZHANG Xu-jiu.Longitudinal forces characteristic of Bogl longitudinal connected ballastless track on high-speed railway bridge[J].Journal of Central South University:Science and Technology,2009,40(2):526-532.(in Chinese)
[2]SUN Lu,CHEN Li-liang,ZELELEW H H.Stress and deflection parametric study of high-speed railway CRTS-IIballastless track slab on elevated bridge foundations[J].Journal of Transportation Engineering,2013,139(12):1224-1234.
[3]WANG Ping,XU Hao,CHEN Rong.Effect of cement asphalt mortar deboning on dynamic properties of CRTSⅡslab ballastless track[J].Advances in Materials Science and Engineering,2014,2014:1-8.
[4]ZHANG Nan,ZHOU Shuang,XIA He,et al.Evaluation of vehicle-track-bridge interacted system for the continuous CRTS-II non-ballast track slab[J].Science China Technological Sciences,2014,57(10):1895-1901.
[5]房建,雷晓燕,练松良.基于车辆-轨道单元的桥上CRTSⅡ型板轨道竖向振动分析[J].铁道科学与工程学报,2015,12(2):221-228.FANG Jian,LEI Xiao-yan,LIAN Song-liang.Analysis of vibration characteristics for elevated CRST II slab track based on vehicle-track element[J].Journal of Railway Science and Engineering,2015,12(2):221-228.(in Chinese)
[6]赵国堂,高亮,赵磊,等.CRTSⅡ型板式无砟轨道板下离缝动力影响分析及运营评估[J].铁道学报,2017,39(1):1-10.ZHAO Guo-tang,GAO Liang,ZHAO Lei,et al.Analysis of dynamic effect of gap under CRTSⅡtrack slab and operation evaluation[J].Journal of the China Railway Society,2017,39(1):1-10.(in Chinese)
[7]刘钰,赵国堂.CRTSⅡ型板式无砟轨道结构层间早期离缝研究[J].中国铁道科学,2013,34(4):1-7.LIU Yu,ZHAO Guo-tang.Analysis of early gap between layers of CRTSⅡslab ballastless track structure[J].China Railway Science,2013,34(4):1-7.(in Chinese)
[8]LOU Ping,ZHU Jun-pu,DAI Gong-lian,et al.Experimental study on bridge-track system temperature actions for Chinese high-speed railway[J].Archives of Civil and Mechanical Engineering,2018,18(2):451-464.
[9]刘永健,刘江,张宁,等.钢-混凝土组合梁温度效应的解析解[J].交通运输工程学报,2017,17(4):9-19.LIU Yong-jian,LIU Jiang,ZHANG Ning,et al.Analytical solution of temperature effects of steel-concrete composite girder[J].Journal of Traffic and Transportation Engineering,2017,17(4):9-19.(in Chinese)
[10]闫斌,刘施,戴公连,等.我国典型地区无砟轨道非线性温度梯度及温度荷载模式[J].铁道学报,2016,38(8):81-86.YAN Bin,LIU Shi,DAI Gong-lian,et al.Vertical nonlinear temperature distribution and temperature mode of unballasted track in typical areas of China[J].Journal of the China Railway Society,2016,38(8):81-86.(in Chinese)
[11]陈嵘,邢俊,谢铠泽,等.温度荷载下纵连式无砟轨道梁轨耦合作用规律[J].铁道工程学报,2017,34(3):15-21.CHEN Rong,XING Jun,XIE Kai-ze,et al.The continuousslab-track coupling laws between the bridge and track under temperature loads[J].Journal of Railway Engineering Society,2017,34(3):15-21.(in Chinese)
[12]戴公连,葛浩,邱远喜,等.制挠工况下高铁大跨连续梁桥上无砟轨道受力研究[J].铁道科学与工程学报,2015,12(3):455-462.DAI Gong-lian,GE Hao,QIU Yuan-xi,et al.Analysis of breaking-bending forces of ballastless track on the high-speed railway long-span continuous beam bridge[J].Journal of Railway Science and Engineering,2015,12(3):455-462.(in Chinese)
[13]朱乾坤,戴公连,闫斌.简支梁-CRTSⅡ型板式无砟轨道制动力传递规律[J].铁道科学与工程学报,2014,11(6):13-19ZHU Qian-kun,DAI Gong-lian,YAN Bin.Transfer law of breaking force between simply-supported bridges and CRTSⅡslab ballastless track[J].Journal of Railway Science and Engineering,2014,11(6):13-19.(in Chinese)
[14]粟淼.高速铁路桥上纵连板式无砟轨道层间界面工作性能初探[D].长沙:中南大学,2014.SU Miao.Preliminary study on interface performance for longitudinal ballastless track on high-speed railway bridges[D].Changsha:Central South University,2014.(in Chinese)
[15]DAI Gong-lian,SU Miao.Full-scale field experimental investigation on the interfacial shear capacity of continuous slab track structure[J].Archives of Civil and Mechanical Engineering,2016,16(3):485-493.
[16]陈小平,王芳芳,赵才友.纵连底座板断裂对桥上CRTSⅡ型板式无砟轨道受力的影响[J].交通运输工程学报,2014,14(4):25-35.CHEN Xiao-ping,WANG Fang-fang,ZHAO Cai-you.Fracture influence of longitudinal-continuous base layer on force characteristics of CRTSⅡslab ballastless track on bridge[J].Journal of Traffic and Transportation Engineering,2014,14(4):25-35.(in Chinese)
[17]戴公连,葛浩,邱远喜,等.高铁大跨度连续梁桥上无砟轨道断板受力研究[J].华中科技大学学报:自然科学版,2015,43(9):100-104,109.DAI Gong-lian,GE Hao,QIU Yuan-xi,et al.Study on broken plate force of ballastless track on high-speed railway long-span continuous beam bridge[J].Journal of Huazhong University of Science and Technology:Natural Science Edition,2015,43(9):100-104,109.
[18]徐庆元,林青腾,方子匀,等.组合荷载下桥上纵连板式无砟轨道疲劳特性[J].中国铁道科学,2017,38(6):37-46.XU Qing-yuan,LIN Qing-teng,FANG Zi-yun,et al.Fatigue characteristics of longitudinally connected slab ballastless track on bridge under combined load[J].China Railway Science,2017,38(6):37-46.(in Chinese)
[19]黄艳,阎贵平,刘林.轨道约束对铁路桥梁纵向地震反应特性的影响[J].铁道学报,2002,24(5):124-128.HUANG Yan,YAN Gui-ping,LIU Lin.Effects of rail restraints on longitudinal seismic response of railway bridges[J].Journal of the China Railway Society,2002,24(5):124-128.(in Chinese)
[20]严猛,魏贤奎,王平,等.大跨桥上无缝线路纵向地震响应研究[J].铁道学报,2014,36(5):96-102.YAN Meng,WEI Xian-kui,WANG Ping,et al.Research on longitudinal seismic response of continuous welded rails on large-span bridges[J].Journal of the China Railway Society,2014,36(5):96-102.(in Chinese)
[21]闫斌,戴公连,徐庆元.行波效应下铁路简支梁桥梁轨系统地震响应[J].振动工程学报,2013,26(3):357-362.YAN Bin,DAI Gong-lian,XU Qing-yuan.Seismic responses of railway track-bridge system under travelling wave effect[J].Journal of Vibration Engineering,2013,26(3):357-362.(in Chinese)
[22]谢旭,王炎,陈列.轨道约束对铁路减隔震桥梁地震响应的影响[J].铁道学报,2012,34(6):75-82.XIE Xu,WANG Yan,CHEN Lie.Effect of rail restraints on seismic responses of cushioning railway bridges[J].Journal of the China Railway Society,2012,34(6):75-82.(in Chinese)
[23]YAN Bin,DAI Gong-lian.Seismic pounding and protection measures of simply-supported beams considering interaction between continuously welded rail and bridge[J].Structural Engineering International,2013,23(1):61-67.
[24]闫斌,刘施,戴公连,等.多维地震作用下桥梁-无砟轨道非线性相互作用[J].铁道学报,2016,38(5):74-80.YAN Bin,LIU Shi,DAI Gong-lian,et al.Nonlinear interaction between CRTSⅡballatless track and bridges due to multi-dimensional earthquake[J].Journal of the China Railway Society,2016,38(5):74-80.(in Chinese)
[25]刘施,闫斌,张鹏飞,等.地震作用下桥梁-CRTSⅡ型无砟轨道相互作用规律[J].铁道科学与工程学报,2017,14(4):669-674.LIU Shi,YAN Bin,ZHANG Peng-fei,et al.The embedded CRTSⅡslab ballastless track in interaction with bridges under seismic action[J].Journal of Railway Science and Engineering,2017,14(4):669-674.(in Chinese)
[26]YAN Bin,DAI Gong-lian,GUO Wen-hua,et al,Longitudinal force in continuously welded rail on long-span tied arch continuous bridge carrying multiple tracks[J].Journal of Central South University,2015,22(5):2001-2006.
[2]SUN Lu,CHEN Li-liang,ZELELEW H H.Stress and deflection parametric study of high-speed railway CRTS-IIballastless track slab on elevated bridge foundations[J].Journal of Transportation Engineering,2013,139(12):1224-1234.
[3]WANG Ping,XU Hao,CHEN Rong.Effect of cement asphalt mortar deboning on dynamic properties of CRTSⅡslab ballastless track[J].Advances in Materials Science and Engineering,2014,2014:1-8.
[4]ZHANG Nan,ZHOU Shuang,XIA He,et al.Evaluation of vehicle-track-bridge interacted system for the continuous CRTS-II non-ballast track slab[J].Science China Technological Sciences,2014,57(10):1895-1901.
[5]房建,雷晓燕,练松良.基于车辆-轨道单元的桥上CRTSⅡ型板轨道竖向振动分析[J].铁道科学与工程学报,2015,12(2):221-228.FANG Jian,LEI Xiao-yan,LIAN Song-liang.Analysis of vibration characteristics for elevated CRST II slab track based on vehicle-track element[J].Journal of Railway Science and Engineering,2015,12(2):221-228.(in Chinese)
[6]赵国堂,高亮,赵磊,等.CRTSⅡ型板式无砟轨道板下离缝动力影响分析及运营评估[J].铁道学报,2017,39(1):1-10.ZHAO Guo-tang,GAO Liang,ZHAO Lei,et al.Analysis of dynamic effect of gap under CRTSⅡtrack slab and operation evaluation[J].Journal of the China Railway Society,2017,39(1):1-10.(in Chinese)
[7]刘钰,赵国堂.CRTSⅡ型板式无砟轨道结构层间早期离缝研究[J].中国铁道科学,2013,34(4):1-7.LIU Yu,ZHAO Guo-tang.Analysis of early gap between layers of CRTSⅡslab ballastless track structure[J].China Railway Science,2013,34(4):1-7.(in Chinese)
[8]LOU Ping,ZHU Jun-pu,DAI Gong-lian,et al.Experimental study on bridge-track system temperature actions for Chinese high-speed railway[J].Archives of Civil and Mechanical Engineering,2018,18(2):451-464.
[9]刘永健,刘江,张宁,等.钢-混凝土组合梁温度效应的解析解[J].交通运输工程学报,2017,17(4):9-19.LIU Yong-jian,LIU Jiang,ZHANG Ning,et al.Analytical solution of temperature effects of steel-concrete composite girder[J].Journal of Traffic and Transportation Engineering,2017,17(4):9-19.(in Chinese)
[10]闫斌,刘施,戴公连,等.我国典型地区无砟轨道非线性温度梯度及温度荷载模式[J].铁道学报,2016,38(8):81-86.YAN Bin,LIU Shi,DAI Gong-lian,et al.Vertical nonlinear temperature distribution and temperature mode of unballasted track in typical areas of China[J].Journal of the China Railway Society,2016,38(8):81-86.(in Chinese)
[11]陈嵘,邢俊,谢铠泽,等.温度荷载下纵连式无砟轨道梁轨耦合作用规律[J].铁道工程学报,2017,34(3):15-21.CHEN Rong,XING Jun,XIE Kai-ze,et al.The continuousslab-track coupling laws between the bridge and track under temperature loads[J].Journal of Railway Engineering Society,2017,34(3):15-21.(in Chinese)
[12]戴公连,葛浩,邱远喜,等.制挠工况下高铁大跨连续梁桥上无砟轨道受力研究[J].铁道科学与工程学报,2015,12(3):455-462.DAI Gong-lian,GE Hao,QIU Yuan-xi,et al.Analysis of breaking-bending forces of ballastless track on the high-speed railway long-span continuous beam bridge[J].Journal of Railway Science and Engineering,2015,12(3):455-462.(in Chinese)
[13]朱乾坤,戴公连,闫斌.简支梁-CRTSⅡ型板式无砟轨道制动力传递规律[J].铁道科学与工程学报,2014,11(6):13-19ZHU Qian-kun,DAI Gong-lian,YAN Bin.Transfer law of breaking force between simply-supported bridges and CRTSⅡslab ballastless track[J].Journal of Railway Science and Engineering,2014,11(6):13-19.(in Chinese)
[14]粟淼.高速铁路桥上纵连板式无砟轨道层间界面工作性能初探[D].长沙:中南大学,2014.SU Miao.Preliminary study on interface performance for longitudinal ballastless track on high-speed railway bridges[D].Changsha:Central South University,2014.(in Chinese)
[15]DAI Gong-lian,SU Miao.Full-scale field experimental investigation on the interfacial shear capacity of continuous slab track structure[J].Archives of Civil and Mechanical Engineering,2016,16(3):485-493.
[16]陈小平,王芳芳,赵才友.纵连底座板断裂对桥上CRTSⅡ型板式无砟轨道受力的影响[J].交通运输工程学报,2014,14(4):25-35.CHEN Xiao-ping,WANG Fang-fang,ZHAO Cai-you.Fracture influence of longitudinal-continuous base layer on force characteristics of CRTSⅡslab ballastless track on bridge[J].Journal of Traffic and Transportation Engineering,2014,14(4):25-35.(in Chinese)
[17]戴公连,葛浩,邱远喜,等.高铁大跨度连续梁桥上无砟轨道断板受力研究[J].华中科技大学学报:自然科学版,2015,43(9):100-104,109.DAI Gong-lian,GE Hao,QIU Yuan-xi,et al.Study on broken plate force of ballastless track on high-speed railway long-span continuous beam bridge[J].Journal of Huazhong University of Science and Technology:Natural Science Edition,2015,43(9):100-104,109.
[18]徐庆元,林青腾,方子匀,等.组合荷载下桥上纵连板式无砟轨道疲劳特性[J].中国铁道科学,2017,38(6):37-46.XU Qing-yuan,LIN Qing-teng,FANG Zi-yun,et al.Fatigue characteristics of longitudinally connected slab ballastless track on bridge under combined load[J].China Railway Science,2017,38(6):37-46.(in Chinese)
[19]黄艳,阎贵平,刘林.轨道约束对铁路桥梁纵向地震反应特性的影响[J].铁道学报,2002,24(5):124-128.HUANG Yan,YAN Gui-ping,LIU Lin.Effects of rail restraints on longitudinal seismic response of railway bridges[J].Journal of the China Railway Society,2002,24(5):124-128.(in Chinese)
[20]严猛,魏贤奎,王平,等.大跨桥上无缝线路纵向地震响应研究[J].铁道学报,2014,36(5):96-102.YAN Meng,WEI Xian-kui,WANG Ping,et al.Research on longitudinal seismic response of continuous welded rails on large-span bridges[J].Journal of the China Railway Society,2014,36(5):96-102.(in Chinese)
[21]闫斌,戴公连,徐庆元.行波效应下铁路简支梁桥梁轨系统地震响应[J].振动工程学报,2013,26(3):357-362.YAN Bin,DAI Gong-lian,XU Qing-yuan.Seismic responses of railway track-bridge system under travelling wave effect[J].Journal of Vibration Engineering,2013,26(3):357-362.(in Chinese)
[22]谢旭,王炎,陈列.轨道约束对铁路减隔震桥梁地震响应的影响[J].铁道学报,2012,34(6):75-82.XIE Xu,WANG Yan,CHEN Lie.Effect of rail restraints on seismic responses of cushioning railway bridges[J].Journal of the China Railway Society,2012,34(6):75-82.(in Chinese)
[23]YAN Bin,DAI Gong-lian.Seismic pounding and protection measures of simply-supported beams considering interaction between continuously welded rail and bridge[J].Structural Engineering International,2013,23(1):61-67.
[24]闫斌,刘施,戴公连,等.多维地震作用下桥梁-无砟轨道非线性相互作用[J].铁道学报,2016,38(5):74-80.YAN Bin,LIU Shi,DAI Gong-lian,et al.Nonlinear interaction between CRTSⅡballatless track and bridges due to multi-dimensional earthquake[J].Journal of the China Railway Society,2016,38(5):74-80.(in Chinese)
[25]刘施,闫斌,张鹏飞,等.地震作用下桥梁-CRTSⅡ型无砟轨道相互作用规律[J].铁道科学与工程学报,2017,14(4):669-674.LIU Shi,YAN Bin,ZHANG Peng-fei,et al.The embedded CRTSⅡslab ballastless track in interaction with bridges under seismic action[J].Journal of Railway Science and Engineering,2017,14(4):669-674.(in Chinese)
[26]YAN Bin,DAI Gong-lian,GUO Wen-hua,et al,Longitudinal force in continuously welded rail on long-span tied arch continuous bridge carrying multiple tracks[J].Journal of Central South University,2015,22(5):2001-2006.