客货共线铁路钢混组合结构桥梁动力分析  

Dynamic Analysis of Steel⁃Concrete Composite Girder Bridge on Mixed Passenger and Freight Railway

作　　者：孙宗磊 李克冰 班新林 SUN Zonglei;LI Kebing;BAN Xinlin(China Railway Economic and Planning Research Institute Co.Ltd.,Beijing 100038,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁路经济规划研究院有限公司,北京100038 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《铁道建筑》2021年第5期1-5,21,共6页Railway Engineering

基　　金：国家自然科学基金(71942006);中国国家铁路集团有限公司科技研究开发计划(K2019G004);中国铁道科学研究院集团有限公司基金(2019YJ046)。

摘　　要：以应用于客货共线铁路的32、40 m跨度钢混组合结构简支梁和3×40、3×48 m钢混组合结构连续梁为研究对象,分析了不同形式钢混组合结构桥梁的自振特性。以美国六级谱生成的轨道不平顺为激励源,对CRH2型列车通过时的车桥动力响应进行了数值模拟。研究结果表明:不同形式的钢混组合结构桥梁在CRH2列车作用下的车桥动力响应满足运行安全性与舒适性的要求;40 m跨度简支梁的竖向加速度小于32 m跨度简支梁,有砟轨道形式的简支梁竖向加速度小于无砟轨道形式;钢混组合结构连续梁在计算速度范围内出现共振响应,但共振响应幅值较小,对列车动力响应影响较小;相同跨度条件下,不同轨道结构形式对列车动力响应影响较小。Steel-concrete composite simply supported girder bridges with the spans of 32 m and 40 m and steelconcrete composite continuous girder bridges with the spans of 3×40 m and 3×48 m applied in mixed passenger and freight railway were taking as research subjects in this paper.The natural vibration characteristics of different steelconcrete composite bridges were analyzed.Taking the track irregularity generated by American six level spectrum as excitation source,the dynamic responses of vehicle-bridge were calculated when CRH2 train passing through the bridge.The research results show that the dynamic responses of different steel-concrete composite bridges under the action of CRH2 train can meet the requirements of safety and comfort.The vertical acceleration of 40 m simply supported girder is less than 32 m simply supported girder.The vertical acceleration of simply supported girder with ballast track is less than that of simply supported girder with ballastless track.Steel-concrete composite continuous girder has resonance response in the range of calculation speed,but the resonance response amplitude is small,which has little influence on the train dynamic response.Different track structures have little influence on the train dynamic response with the same span.

关 键 词：铁路桥梁 动力分析 数值模拟 钢混组合梁桥 客货共线铁路 车桥动力响应 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]