考虑桩-土相互作用的连续刚构桥车桥耦合振动分析

李小珍;刘孝寒;刘德军

振动与冲击 ›› 2011, Vol. 30 ›› Issue (12) : 54-58.

PDF(1423 KB)
PDF(1423 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (12) : 54-58.
论文

考虑桩-土相互作用的连续刚构桥车桥耦合振动分析

  • 李小珍;刘孝寒;刘德军
作者信息 +

Coupled vibration analysis of railway continuous rigid-frame bridge and vehicles with soil-structure interaction

  • LI Xiao-zhen,LIU Xiao-han,LIU De-jun
Author information +
文章历史 +

摘要

针对某高速铁路上一座位于软弱地基处的连续刚构桥,为研究考虑桩-土相互作用对上部结构和车辆动力响应的准确影响,避免由于桩顶横向位移和弯曲的耦合作用带来的误差,建立包含桩基础的整体桥梁模型(全桩模型),对比以往常用的墩底固结模型和在承台底施加弹簧约束的模型(等效刚度模型)。计算分析了三种模型的自振特性,使用桥梁动力分析程序BDAP V2.0分别进行动力仿真分析。对比分析表明:考虑桩-土相互作用对桥梁横向振动有较大影响,其中横向动位移显著增大,最大误差达31%,而横向加速度降低;全桩模型由于考虑了桩土相互作用以及横向位移和弯曲的耦合作用,比墩底固结模型和等效刚度模型要合理;高速铁路桥梁位于软弱地基处且具有高桩承台时,应采用考虑桩-土-上部结构动力相互作用的有限元模型进行车桥动力仿真分析。

Abstract

The effect of soil-structure interaction on the coupled vibration of continuous rigid-frame bridges and vehicles under high speed vehicle load was discussed. With BDAP V2.0(Bridge Dynamic Analysis Program), the natural frequencies and dynamic responses of the bridge under vehicle load are calculated by using a new bridge model(whole-pile model), which can take account of the interaction of lateral displacement and bending angle on group-piles. Comparing with commonly used consolidation model and equivalent-stiffness model, the dynamic response of bridge, especially the lateral dynamic response, varies a lot by considering soil-structure interaction. While the maximum dynamic accelerations get lower, the maximum dynamic displacements become much higher, the maximum error reaches 31%. For a high speed railway bridge located in soft ground with high-pile cap foundation, whole-pile model is proposed to analysis the coupled vibration of vehicle and bridge.

关键词

桩-土动力相互作用 / 车桥耦合振动 / 动力响应 / 连续刚构桥

Key words

soil-structure dynamic interaction / vehicle-bridge coupled vibration / dynamic response / rigid-frame bridge

引用本文

导出引用
李小珍;刘孝寒;刘德军.
考虑桩-土相互作用的连续刚构桥车桥耦合振动分析[J]. 振动与冲击, 2011, 30(12): 54-58
LI Xiao-zhen;LIU Xiao-han;LIU De-jun. Coupled vibration analysis of railway continuous rigid-frame bridge and vehicles with soil-structure interaction[J]. Journal of Vibration and Shock, 2011, 30(12): 54-58

考虑桩-土相互作用的连续刚构桥车桥耦合振动分析" title="Share on Weibo" target="_blank">
PDF(1423 KB)

Accesses

Citation

Detail

段落导航
相关文章

/