跨座式单轨曲线轨道梁横向位移研究论文_赵雄霖

深圳市博瑞琪道桥工程咨询有限公司 518048

摘要:运营阶段轨道梁在恒载、列车荷载、列车横向摇摆力、离心力、风力等作用下会产生水平横向位移。而规范中对于轨道梁的横桥向挠度尚未作出具体规定。若横向挠度过大,将对列车行驶产生不利影响。跨座式单轨简支梁由于对路线的适应性强,因此常出现小半径轨道梁。而曲线梁在结构受力上具有弯扭耦合的特殊性,因此其受力特性应予以重视。本文以深圳某云轨(跨座式单轨)简支梁为研究对象,采用有限元软件Midas/Civil建立有限元计算模型,对轨道梁横向位移进行了简要分析。

关键词:跨座式单轨横向位移小半径轨道梁有限元分析

THE STUDY OF LATERAL DISPLACEMENT OF MONORAIL STRADDLE-BEAM

ZHAO XIONGLIN

(BORUIQI road and bridge engineering Consulting Co, Ltd,Shenzhen,China)

Abstract Under the combined actions of dead load, RAIL load , lateral force of train , centrifugal force , wind load during the operation stage ,there will be a lateral displacement on straddle-beam.However, there is no explicit stipulation in the <Code for design of straddle monorail transit> regarding the lateral displacement. The large displacement will cause sever adverse impact on the structure. Due to the limitation of the horizontal alignment,the straddle-beam nomorail is always designed to be curved bridge with small radius on the plane. Moreover, the bending-torsional coupling effect of curved beam leads to complex forces. Therefore, the mechanical characteristics of the straddle-beam have to be studied carefully. In this paper, the research on lateral displacement of the beam is carried out by establishing the finite element model of simply supported beam with FEM software Midas/Civil.

KEY WORDS : STRADDLE MONORAILLATERAL DISPLACEMENTSMALL-RADIUS CURVED BRIDGE FINITE ELEMENT ANALYSIS

桥,由于内外侧横向位移数值及变化趋势皆较为接近,在以下图形中所示数值均为内线横向变形结果。

3.结语

通过对三座不同跨径、不同半径的简支梁桥的横向位移计算表明,曲线轨道梁在恒载、列车摇摆力、离心力、横向风荷载等作用下均会产生横向位移。恒载作用下的横向位移较小,列车横向摇摆力、离心力在不同曲线半径、不同跨径简支轨道梁产生的横向位移变化较为平稳,差值较小。当列车通过曲线轨道梁时在风荷载的作用下产生的横向位移较大,且明显大于轨道梁在恒载、列车摇摆力、离心力作用下产生的横向位移。因此,在风力较大的沿海等地区,轨道梁车桥一体在横风作用下的横向位移应引起设计者的重视,尽管规范对此并未加以具体限制。轨道梁在各种工况的荷载组合作用下取最大最小位移包络值,梁体沿曲线内外侧均可能产生较大的横向位移。若参考竖向挠度不超过跨度的1/800的规定,上文中跨径20m、22m、24m简支梁的横向挠度与跨径的比值分别为0.00120、0.00132、0.00121,均与0.00125接近且22m跨径的简支梁已经超过该比值。

论文作者:赵雄霖

论文发表刊物:《基层建设》2017年第17期

论文发表时间:2017/10/30

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跨座式单轨曲线轨道梁横向位移研究论文_赵雄霖
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