高墩刚构桥基础不均匀沉降对无缝线路的影响研究

发布时间：2018-05-26 16:57

本文选题：铁路桥 + 刚构桥　；参考：《铁道标准设计》2014年08期

【摘要】：高墩大跨刚构桥桥墩若出现工后沉降,桥墩纵向和横向的沉降值存在差异,将导致桥墩出现纵横向偏转。针对桥墩偏转对无缝线路的影响,结合某一高墩大跨刚构桥上无缝线路,利用有限元方法,建立空间线—桥—墩—体化模型,分析桥墩纵向、横向偏转对桥上无缝线路的影响。计算结果表明:随着桥墩纵向偏转角度的增加,钢轨中产生的附加力近似呈线性增加;当桥墩纵向偏转与温度荷载耦合时,桥墩纵向偏转所引起的钢轨纵向力变化幅度不大。桥墩的横向偏转主要引起轨道长波不平顺,钢轨位移及不平顺随着桥墩的横向偏转角的增加而增加,并且当桥墩横向偏转角较大时,整个桥上无缝线路会出现多处不平顺超限,超限位置主要分布在左、右侧桥台及两个梁体接缝处。
[Abstract]:In the case of post-construction settlement of the piers of long-span rigid frame bridges with high piers, there are differences between longitudinal and lateral settlement values of the piers, which will lead to longitudinal and horizontal deflection of the piers. In view of the influence of pier deflection on CWR, a finite element method is used to establish a spatial line-bridge pier-body model to analyze the influence of longitudinal and lateral deflection of piers on the CWR on a long span rigid frame bridge with high piers. The calculation results show that the additional force generated in the rail increases linearly with the increase of the longitudinal deflection angle of the pier, and the longitudinal deflection of the pier causes little variation of the rail longitudinal force when the longitudinal deflection of the pier is coupled with the temperature load. The lateral deflection of the pier mainly causes the track long wave irregularity, the rail displacement and irregularity increase with the increase of the lateral deflection angle of the pier, and when the lateral deflection angle of the pier is large, there will be many irregularity over the whole bridge. The overrun position is mainly located at the left and right abutments and the joints of two beams.
【作者单位】：西南交通大学高速铁路线路工程教育部重点实验室;
【基金】：中央高校基本科研业务费专项资金资助项目(编号:2682013CX043)
【分类号】：U448.23;U213.9

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