悬挂式单轨交通系统墩-梁整体分析
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摘要
悬挂式单轨交通系统是一种新型轻量化城市轨道交通形式,为了解该系统中桥墩-轨道梁的整体性能,以30m跨度的悬挂式单轨Y形桥墩-轨道梁体系为对象进行研究。采用MIDAS Civil有限元软件建立该体系整体受力模型,对比分析12.5,14.5,16.5,18.5m4种墩高情况下,该结构体系在不同荷载组合下的静、动力效应及疲劳特性。结果表明:横向风荷载和车辆摇摆力的影响随着墩高的增大急剧增加,横向风荷载是控制墩高设计的主要影响因素;静、活载偏心加载组合下,桥墩最大应力发生在桥墩底部,墩底的疲劳应力幅随墩高增大而增大,其中弯曲应力幅远远大于轴压应力幅;30m轨道梁的竖弯刚度相对较大,侧弯和纵向刚度相对较小,基频相应的振型为纵飘。
Suspended monorail transportation system is a new type of lightweight urban rail transit.In order to understand the overall performance of pier-track beam in the system,taking a Y-shaped pier-track beam system with 30 mspan as a study object,we adopted MIDAS Civil finite element software to establish an overall model of the system.Moreover,we analyzed and compared the static and dynamic effects and fatigue characteristics of the structure system under different load combinations under four different pier heights of 12.5,14.5,16.5,and 18.5 m.The results show that the influence of transverse wind load and rolling force of vehicles will increase sharply with the increase of pier height,and the transverse wind load is the main factor controlling the pier height;under the eccentric loading combination of static load and live load,the maximum stress of pier occurs at the bottom of pier,and the amplitude of fatigue stress at the bottom of pier will increase with the increase of pier height,in which the stress amplitude under bending-tension is much greater than that under the axial compression;the vertical bending stiffness of 30 mtrack beam is relatively large,while lateral bending and longitudinal stiffness are relatively small,and the vibration mode corresponding to fundamental frequency is longitudinal drift.
Suspended monorail transportation system is a new type of lightweight urban rail transit.In order to understand the overall performance of pier-track beam in the system,taking a Y-shaped pier-track beam system with 30 mspan as a study object,we adopted MIDAS Civil finite element software to establish an overall model of the system.Moreover,we analyzed and compared the static and dynamic effects and fatigue characteristics of the structure system under different load combinations under four different pier heights of 12.5,14.5,16.5,and 18.5 m.The results show that the influence of transverse wind load and rolling force of vehicles will increase sharply with the increase of pier height,and the transverse wind load is the main factor controlling the pier height;under the eccentric loading combination of static load and live load,the maximum stress of pier occurs at the bottom of pier,and the amplitude of fatigue stress at the bottom of pier will increase with the increase of pier height,in which the stress amplitude under bending-tension is much greater than that under the axial compression;the vertical bending stiffness of 30 mtrack beam is relatively large,while lateral bending and longitudinal stiffness are relatively small,and the vibration mode corresponding to fundamental frequency is longitudinal drift.
引文
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[2]郭臣.悬挂式单轨交通线路技术标准研究[J].铁道建筑,2018,58(3):67-71.(GUO Chen.Research on Technical Standards for Suspended Monorail Line[J].Railway Engineering,2018,58(3):67-71.in Chinese)
[3]钟异莹,陈坚,唐炜.山地城市悬挂式单轨交通系统可行性研究[J].铁道运输与经济,2015,37(7):87-91.(ZHONG Yi-ying,CHEN Jian,TANG Wei.Study on Feasibility of Suspended Monorail Transit System in Mountain Cities[J].Railway Transport and Economy,2015,37(7):87-91.in Chinese)
[4]林志雄,周岱.上海磁浮列车轨道梁系统简述[J].中国铁道科学,2003,24(1):104-107.(LIN Zhi-xiong,ZHOU Dai.Brief Introduction of the Track of Shanghai Maglev[J].China Railway Science,2003,24(1):104-107.in Chinese)
[5]肖云霞,王月明,杨东晓,等.悬挂式单轨直线轨道梁结构优化设计探讨[J].钢结构,2015,30(4):68-71.(XIAO Yun-xia,WANG Yue-ming,YANG Dong-xiao,et al.Research on Optimization Design of the Straight Track Beam Structure of Suspended Monorail[J].Steel Construction,2015,30(4):68-71.in Chinese)
[6]杨平,鲍玉龙,曾永平,等.悬挂式单轨交通系统桥梁结构的选型设计[J].铁道工程学报,2016,33(7):30-35,77.(YANG Ping,BAO Yu-long,ZENG Yong-ping,et al.Type Selection Design for Bridge Structure of Suspended Monorail Transit System[J].Journal of Railway Engineering Society,2016,33(7):30-35,77.in Chinese)
[7]谢倩,王月明,蒋咏志,等.考虑加劲肋的悬挂式单轨轨道梁挠度研究[J].城市轨道交通研究,2017,20(8):11-16.(XIE Qian,WANG Yue-ming,JIANG Yong-zhi,et al.Deflection of Suspended Monorail Track Beam with Stiffeners[J].Urban Mass Transit,2017,20(8):11-16.in Chinese)
[8]邓亚士,魏庆朝,时瑾.高速磁浮桥上轨道梁振动特性初步研究[J].振动工程学报,2008,21(3):248-254.(DENG Ya-shi,WEI Qing-chao,SHI Jin.Vibration Characteristics of Guideway Specific for Bridge of Maglev Under Irregularities[J].Journal of Vibration Engineering,2008,21(3):248-254.in Chinese)
[9]刘羽宇,葛玉梅,杨翊仁.跨座式轻轨钢轨道梁的动力特性有限元分析[J].世界桥梁,2010(1):40-43.(LIU Yu-yu,GE Yu-mei,YANG Yi-ren.Finite Element Analysis of Dynamic Behavior of Monorail Steel Track Beam of Straddle Type Light Rail Transit[J].World Bridges,2010(1):40-43.in Chinese)
[10]何庆烈,蔡成标,翟婉明,等.悬挂式单轨列车与轨道梁桥系统动力性能试验研究[J].铁道学报,2018,40(10):57-63.(HE Qing-lie,CAI Cheng-biao,ZHAI Wan-ming,et al.Experimental Research on Dynamic Performance of Suspended Monorail Train-Bridge Coupled System[J].Journal of the China Railway Society,2018,40(10):57-63.in Chinese)
[11]XIA H,Roeck G De,ZHANG H R,et al.Dynamic Analysis of Train-Bridge System and Its Application in Steel Girder Reinforcement[J].Computers&Structures,2001,79(20-21):1 851-1 860.
[12]ZHANG N,XIA H.Dynamic Analysis of Coupled Vehicle-Bridge System Based on Inter-System Iteration Method[J].Computers&Structures,2013,114-115:26-34.
[13]ZHAI W M,WANG S L,ZHANG N,et al.HighSpeed Train Track-Bridge Dynamic Interactions-PartⅡ:Experimental Validation and Engineering Application[J].International Journal of Rail Transportation,2013,1:25-41.
[14]ZHAI WM,Xia H,CAI C B,et al.High-Speed Train-Track-Bridge Dynamic Interactions-Part I:Theoretical Model and Numerical Simulation[J].International Journal of Rail Transportation,2013,1:3-24.