摘要
悬挂式单轨结构轨道梁为开口钢箱梁,具有结构刚度小、活载与恒载比值大、宽跨比小和结构阻尼比小等特点。文章利用MIDAS Civil分析悬挂式单轨结构不同跨度、墩高及形式(连续梁和简支梁)的振动特性和地震响应规律。研究结果表明,其结构主要振型以轨道梁横向弯曲变形、梁墩扭转和弯曲变形为主,墩高、跨度、结构形式以及行车对结构抗震性能影响较大;采用20m跨度、矮墩、简支形式的设计方案有利于结构体系的抗震性能;目前运营的悬挂式单轨结构能够满足城市轨道交通抗震设防要求。
Suspended monorail track girder is an open steel box girder,which has the characteristics of small structural stiffness,large ratio of live load to dead load,small ratio of width to span and small ratio of structural damping.MIDAS Civil is used to analyze the vibration characteristics and seismic responses patterns of suspended monorail structures with different spans,pier heights and forms(continuous beam and simply supported beam).The results show that the main vibration modes of the structure are transverse bending deformation of track beam,torsion and bending deformation of beam pier,and the pier height,span,structure form and train operation have great impact on the seismic performance of the structure,the design scheme of 20 m span,low pier and simply supported beam form is beneficial to the seismic performance of the structure system.The suspended monorail structure currently in operation meets the requirements of seismic requirements by urban rail transit.
作者
庞林
陶奇
郑晓龙
Pang Lin;Tao Qi;Zheng Xiaolong
出处
《现代城市轨道交通》
2019年第3期40-43,共4页
Modern Urban Transit
基金
四川省科技计划重点研发项目(2017GZ0083)
关键词
悬挂式单轨
结构振动
地震响应
suspended monorail
structural vibration
seismicresponse
