悬挂式单轨交通系统墩-梁整体分析

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。

Pier-Beam Integral Analysis of Suspended Monorail Traffic System

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 m span 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 m track beam is relatively large,while lateral bending and longitudinal stiffness are relatively small,and the vibration mode corresponding to fundamental frequency is longitudinal drift.