摘要
调研我国高速铁路典型桥梁的实测自振频率和运营列车的实测竖向加速度,发现在列车荷载的周期性作用下(40+56+40)m和(40+64+40)m连续梁可能发生共振,阐述了列车与桥梁结构之间的共振作用机理。以(40+64+40)m连续梁桥为例,基于实桥参数和通用图的设计参数分别建立车桥耦合动力模型进行仿真分析。结果表明:实桥自振频率通常高于设计值,导致列车实际共振速度与设计频率对应的共振速度存在差异,当实际桥梁的自振频率处于共振频率范围内时,需要根据实际桥梁的混凝土弹性模量、二期恒载等参数进行动力响应分析;运营车速范围内引起了连续梁桥的共振响应,但桥面振动加速度满足规范要求,轨道结构保持稳定,车辆并未受到周期性激励,未发生车辆共振,仿真分析结果与实测规律一致。
Based on the survey of the measured natural vibration frequency of typical high speed railway bridges in China and the measured vertical acceleration of operating trains,it is found that(40+56+40)m and(40+64+40)m continuous girders may resonate under the periodic action of train loads.The mechanism of resonance between trains and bridge structures was described.Taking the(40+64+40)m continuous girder bridge as an example,the vehicle bridge coupling dynamic models were established respectively based on the actual bridge parameters and the design parameters of the general drawing for simulation analysis.The results show that the natural vibration frequency of the real bridge is usually higher than the design value,which leads to the difference between the actual resonance speed of the train and the resonance speed corresponding to the design frequency.When the natural vibration frequency of the actual bridge is within the range of the resonance frequency,the dynamic response analysis needs to be carried out according to the concrete elastic modulus of the actual bridge,the secondary dead load and other parameters.Resonance response of continuous girder bridge is caused within the operating speed range,but the vibration acceleration of bridge deck meets the specification requirements,the track structure remains stable,the vehicle is not subject to periodic excitation,and vehicle resonance does not occur.The simulation analysis results are consistent with the measured laws.
作者
王韫璐
高芒芒
高彦嵩
简方梁
孟鑫
WANG Yunlu;GAO Mangmang;GAO Yansong;JIAN Fangliang;MENG Xin(Postgraduate Department,China Academy of Railway Sciences,Beijing 100081,China;Infrastructure Inspection Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Technology and Information Department,CHINA RAILWAY,Beijing 100844,China;China Railway Engineering Design Consulting Group Corporation Limited,Beijing 100055,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《铁道建筑》
北大核心
2022年第12期117-122,共6页
Railway Engineering
基金
国家自然科学基金高铁联合基金(U1934207)
中国国家铁路集团有限公司科技研究开发项目(SY2021G002)
中国铁道科学研究院集团有限公司科研开发项目(2021YJ258)。
关键词
铁路桥梁
车桥耦合
数值计算
连续梁桥
桥梁共振
共振车速
railway bridge
vehicle-bridge coupling
numerical calculation
continuous girder
bridge resonance
resonance speed
