跨座式单轨钢混结合轨道梁桥静动力分析  

Static and Dynamic Analysis of Straddle-type Monorail Steel-concrete Composite Track Girder Bridge

作　　者：刘云飞 栗怀广[1] 郑凯锋[1] LIU Yunnfei;LI Huaiguang;ZHENG Kaifeng(School of Civil Engineering,Southwestern Jiaotong University,CHengdu 610031)

机构地区：[1]西南交通大学土木工程学院

出　　处：《都市快轨交通》2019年第5期91-95,108,共6页Urban Rapid Rail Transit

摘　　要：以跨座式单轨交通线路上采用的钢混轨道梁桥为研究对象,利用大型通用有限元软件ANSYS建立三维有限元模型。采用容许应力法计算在4种组合下的竖向和横向位移,分析静力及自振特性。结果表明,轨道梁在静活载作用下竖向位移满足规范要求,采用多种工况组合分析时,顶板最小纵向正应力为–171.42MPa,底板的最大纵向正应力为146.99 MPa,均出现在结构的跨中位置;横撑和下平纵联的横向正应力为115.63 MPa,剪应力范围为13.85~15.13 MPa,可以看出结构在各个荷载工况下应力水平较低,小于容许应力,轨道梁整体刚度大,具有较好的动力性能,结构设计合理、安全,可为此类桥梁的设计提供理论依据和技术参考。The three-dimensional finite element model of the steel-concrete track girder bridge used in straddle-type monorail transit line is established using the large-scale general finite element software ANSYS. The allowable stress method is used to calculate the vertical and lateral displacements of the composite under four combinations, and the static and natural vibration characteristics are analyzed. The results show that the vertical displacement of the rail beam under static and live loading can meet the requirements of the code. The minimum longitudinal normal stress of the roof is-171.42 MPa, and the maximum longitudinal normal stress of the floor is 146.24 MPa, all of which appear in the mid-span position of the structure. The transverse normal stress of the transverse brace and the lower horizontal longitudinal joint is 115.63 MPa, and the shear stress range is 13.85–15.13 MPa. It can be seen that the stress level of the structure is low and less than the allowable stress under various loading conditions. The overall rigidity of the track beam is large, and the track beam has good dynamic performance. The structural design is reasonable and safe, which provides a theoretical basis and technical reference for the design of such bridges.

关 键 词：城市轨道交通 跨座式单轨交通 静力分析 动力分析 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]