考虑轨道系统的高速铁路连续梁桥结构系统参数对纵向地震响应的影响
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摘要
为研究无砟轨道系统约束作用下的高铁连续梁桥纵向地震响应,以某组合桥跨布置高铁桥梁结构(2×32m简支梁+(48+80+48) m连续梁+2×32 m简支梁)为例,针对CRTSⅡ型纵连板式无砟轨道系统的结构特点,建立考虑轨道系统结构层间相互作用的叠合梁模型,研究轨道系统约束作用、地震波激励、滑动层摩擦因数、底座板刚度和制动墩抗推刚度对桥梁结构纵向地震响应的影响。分析结果表明:轨道系统对桥梁结构的约束作用可减弱结构纵向地震响应;在不同频谱特性的地震波激励下,桥梁结构地震响应明显不同,当地震波卓越频率与结构自振频率接近时,将放大结构地震响应;随着轨道系统滑动层摩擦因数增加,连续梁桥纵向地震响应减小,简支梁桥纵向地震响应增强;底座板刚度变化对桥梁纵向地震响应影响较小;增加连续梁桥制动墩抗推刚度,将增强制动墩地震内力响应,需要根据不同抗震需求合理设计桥墩抗推刚度。
The longitudinal seismic response of the high-speed railway continuous beam bridge was studied in this paper. A combined type high-speed railway bridge was taken as an analysis example. The bridge system consists of two 32 m simple-supported bridges, one(48+80+48) m continuous-beam bridge and two 32 m simplesupported bridges. The finite element of the example bridge was established, in which the CRTSⅡ slab ballastless track on the bridge was considered. Based on this model, this paper studied the influence of some parameters on bridge longitudinal seismic response, corresponding to the seismic wave spectrum, the friction coefficient of sliding layer, the rigidity of the base plate and the push rigidity of abutment pier. The research has obtained some results. Compared with the no track finite element model, the longitudinal seismic response of the model considering the track system is weakened. The seismic response spectrum has great influence on the bridge seismic response, which will be increased when seismic wave predominant frequency is close to the natural frequency of the structure. With the increasement of the friction coefficient of sliding layer, the seismic response of the continuous beam bridge is reduced, and the seismic response of the simply supported beam bridges is increased. The stiffness change of the base plate has little influence on the bridge longitudinal seismic response. The increasement of the push rigidity of continuous beam bridge's brake pier will intensify its force response. Therefore, it is necessary to design pier push stiffness according to the different seismic requirements.
The longitudinal seismic response of the high-speed railway continuous beam bridge was studied in this paper. A combined type high-speed railway bridge was taken as an analysis example. The bridge system consists of two 32 m simple-supported bridges, one(48+80+48) m continuous-beam bridge and two 32 m simplesupported bridges. The finite element of the example bridge was established, in which the CRTSⅡ slab ballastless track on the bridge was considered. Based on this model, this paper studied the influence of some parameters on bridge longitudinal seismic response, corresponding to the seismic wave spectrum, the friction coefficient of sliding layer, the rigidity of the base plate and the push rigidity of abutment pier. The research has obtained some results. Compared with the no track finite element model, the longitudinal seismic response of the model considering the track system is weakened. The seismic response spectrum has great influence on the bridge seismic response, which will be increased when seismic wave predominant frequency is close to the natural frequency of the structure. With the increasement of the friction coefficient of sliding layer, the seismic response of the continuous beam bridge is reduced, and the seismic response of the simply supported beam bridges is increased. The stiffness change of the base plate has little influence on the bridge longitudinal seismic response. The increasement of the push rigidity of continuous beam bridge's brake pier will intensify its force response. Therefore, it is necessary to design pier push stiffness according to the different seismic requirements.
引文
[1]KANG Xin,JIANG Lizhong,YU Bai,et al.Seismic damage evaluation of high-speed railway bridge components under different intensities of earthquake excitations[J].Engineering Structures,2017,152:116-128.
[2]Lemura H,Iwata S,Murata K.Shake table tests and numerical modeling of seismically isolated railway bridges[C]//Proceedings of the 13th World Conference on Earthquake Engineering,2004:1-15.
[3]吴青松,任娟娟,刘学毅,等.用于铺设Ⅱ型板式轨道的大跨连续梁桥合理温度跨度研究[J].铁道科学与工程学报,2016,13(3):414-422.WU Qingsong,REN Juanjuan,LIU Xueyi,et al.Research on the critical expansion length of large span continuous beam bridge for CRTSⅡslab track[J].Journal of Railway Science and Engineering,2016,13(3):414-422.
[4]彭定成.考虑轨道系统的高速铁路连续梁桥纵向地震响应研究[D].长沙:中南大学,2017.PENG Dingcheng.The research on longitudinal seismic response of high speed railway continuous beam bridges considering the track system[D].Changsha:Central South University,2017.
[5]闫斌,戴公连,粟淼.考虑轨道约束的高速铁路简支梁碰撞效应研究[J].桥梁建设,2014,44(6):24-28.YAN Bin,DAI Gonglian,SHU Miao.Study of pounding effect of high-speed railway simply-supported beam bridge considering track constraint[J].Bridge Construction,2014,44(6):24-28.
[6]张永亮,赵继栋,陈兴冲,等.轨道约束对高铁大跨连续梁桥地震反应的影响[J].铁道工程学报,2015,32(7):47-50.ZHANG Yongliang,ZHAO Jidong,CHEN Xingchong,et al.Influence of track system restraint on seismic response of the high-speed railway long-span continuous girder bridge[J].Journal of Railway Engineering Society,2015,32(7):47-50.
[7]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 Pengfei,et al.The embedded CRTSⅡslab ballastrless track in interaction with bridges under seimic action[J].Journal of Railway Science and Engineering,2017,14(4):669-674.
[8]史航.考虑精细化建模的高速铁路简支梁桥纵向地震反应研究[D].长沙:中南大学,2015.SHI Hang.The refinement research on longitudinal seimic response of simply supported beam bridges for high speed railway[D].Changsha:Central South University,2015.
[9]杨孟刚,周卫卫,乔建东.基于限位索的简支梁桥地震防碰研究[J].地震工程与工程振动,2015,35(5):99-104.YANG Menggang,ZHOU Weiwei,QIAO Jiandong.Research on using cable restrainers to prevent collision between girders for simple supported bridges under strong earthquake[J].Earthquake Engineering and Engineering Dynamics,2015,35(5):99-104.
[10]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):13-19.ZHU Qiankun,DAI Gonglian,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.
[11]TB 10015-2012,铁路无缝线路设计规范[S].TB 10015-2012,Code for design of railway continuous welded rail[S].
[12]铁道部工程管理中心.京津城际轨道交通工程CRTSⅡ型板式无砟轨道技术总结报告[R].北京:铁道部工程管理中心,2008.Engineering Management Center of the Ministry of Railways.Summary report on the technology of CRTS IIslab ballastless track for Beijing Tianjin intercity rail transit project[R].Beijing:Engineering Management Center of the Ministry of Railways,2008.
[13]魏强,赵国堂,蔡小培.CRTSⅡ型板式轨道台后锚固结构研究[J].铁道学报,2013,35(7):90-95.WEI Qiang,ZHAO Guotang,CAI Xiaopei.Study on anchor structure behind the abutment for slab track CRTSⅡ[J].Journal of the China Railway Society,2013,35(7):90-95.
[2]Lemura H,Iwata S,Murata K.Shake table tests and numerical modeling of seismically isolated railway bridges[C]//Proceedings of the 13th World Conference on Earthquake Engineering,2004:1-15.
[3]吴青松,任娟娟,刘学毅,等.用于铺设Ⅱ型板式轨道的大跨连续梁桥合理温度跨度研究[J].铁道科学与工程学报,2016,13(3):414-422.WU Qingsong,REN Juanjuan,LIU Xueyi,et al.Research on the critical expansion length of large span continuous beam bridge for CRTSⅡslab track[J].Journal of Railway Science and Engineering,2016,13(3):414-422.
[4]彭定成.考虑轨道系统的高速铁路连续梁桥纵向地震响应研究[D].长沙:中南大学,2017.PENG Dingcheng.The research on longitudinal seismic response of high speed railway continuous beam bridges considering the track system[D].Changsha:Central South University,2017.
[5]闫斌,戴公连,粟淼.考虑轨道约束的高速铁路简支梁碰撞效应研究[J].桥梁建设,2014,44(6):24-28.YAN Bin,DAI Gonglian,SHU Miao.Study of pounding effect of high-speed railway simply-supported beam bridge considering track constraint[J].Bridge Construction,2014,44(6):24-28.
[6]张永亮,赵继栋,陈兴冲,等.轨道约束对高铁大跨连续梁桥地震反应的影响[J].铁道工程学报,2015,32(7):47-50.ZHANG Yongliang,ZHAO Jidong,CHEN Xingchong,et al.Influence of track system restraint on seismic response of the high-speed railway long-span continuous girder bridge[J].Journal of Railway Engineering Society,2015,32(7):47-50.
[7]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 Pengfei,et al.The embedded CRTSⅡslab ballastrless track in interaction with bridges under seimic action[J].Journal of Railway Science and Engineering,2017,14(4):669-674.
[8]史航.考虑精细化建模的高速铁路简支梁桥纵向地震反应研究[D].长沙:中南大学,2015.SHI Hang.The refinement research on longitudinal seimic response of simply supported beam bridges for high speed railway[D].Changsha:Central South University,2015.
[9]杨孟刚,周卫卫,乔建东.基于限位索的简支梁桥地震防碰研究[J].地震工程与工程振动,2015,35(5):99-104.YANG Menggang,ZHOU Weiwei,QIAO Jiandong.Research on using cable restrainers to prevent collision between girders for simple supported bridges under strong earthquake[J].Earthquake Engineering and Engineering Dynamics,2015,35(5):99-104.
[10]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):13-19.ZHU Qiankun,DAI Gonglian,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.
[11]TB 10015-2012,铁路无缝线路设计规范[S].TB 10015-2012,Code for design of railway continuous welded rail[S].
[12]铁道部工程管理中心.京津城际轨道交通工程CRTSⅡ型板式无砟轨道技术总结报告[R].北京:铁道部工程管理中心,2008.Engineering Management Center of the Ministry of Railways.Summary report on the technology of CRTS IIslab ballastless track for Beijing Tianjin intercity rail transit project[R].Beijing:Engineering Management Center of the Ministry of Railways,2008.
[13]魏强,赵国堂,蔡小培.CRTSⅡ型板式轨道台后锚固结构研究[J].铁道学报,2013,35(7):90-95.WEI Qiang,ZHAO Guotang,CAI Xiaopei.Study on anchor structure behind the abutment for slab track CRTSⅡ[J].Journal of the China Railway Society,2013,35(7):90-95.