重载铁路双柱式桥墩加固技术优化研究
Optimization Research on Reinforcement Technology of Double-column Piers of Heavy Haul Railway
陈树礼 1李夷豪 2张建功 2王泽涛 2祁鉴全2
作者信息
- 1. 石家庄铁道大学 安全工程与应急管理学院,河北 石家庄 050043;石家庄铁道大学 河北省大型结构健康诊断与控制重点实验室,河北 石家庄 050043
- 2. 石家庄铁道大学 土木工程学院,河北 石家庄 050043
- 折叠
摘要
为探索基于性能提升的桥墩加固优化设计方法,以重载铁路中数量较多的分离式双柱式桥墩为对象,基于数值模拟分析和桥墩加固运营性能试验,开展 3 种常用方法加固条件下的桥墩静力性能对比分析和动力性能对比试验研究,并进行加固技术优化研究.结果表明,设计荷载作用下,墩身外包加固抑制墩顶水平位移效果较好,而"增大基础和增补桩基"组合加固则能有效减少基底截面应力;运营列车作用下,3 种方法加固条件的墩顶横向振幅较加固前均有不同程度降低,但也有部分桥墩受施工等因素影响出现振幅增大的情况.采用优化提出的"增大基础+增补桩基+墩身外包"三重加固法,墩顶横向振幅降低幅度超过 50%,能够很好地满足重载铁路双柱式桥墩强化改造需求.
Abstract
In order to explore the optimal design method of bridge pier reinforcement based on per-formance improvement,this paper takes a large number of separated double-column piers in heavy haul railway as the object.Based on the numerical simulation analysis and the operation performance test of bridge pier reinforcement,the static performance comparison analysis and dynamic performance compar-ison test of bridge piers under the reinforcement conditions of three common methods are carried out,and the reinforcement technology optimization research is carried out.The results show that under the design load,the reinforcement of the pier body has a good effect on suppressing the horizontal displace-ment of the pier top,while the combined reinforcement of"increasing the foundation and supplementing the pile foundation"can effectively reduce the stress of the base section.Under the action of operating trains,the lateral amplitude of the pier top of the three methods of reinforcement conditions is reduced to varying degrees compared with that before reinforcement,but some piers are affected by construction and other factors,and the amplitude increases.The optimized triple reinforcement method of"increas-ing foundation + adding pile foundation + pier body outsourcing"is adopted,and the lateral amplitude of pier top is reduced by more than 50%,which can well meet the needs of strengthening and recon-struction of double-column piers of heavy haul railway.
关键词
重载铁路/双柱式桥墩/加固技术/数值模拟/现场试验/优化设计Key words
heavy haul railway/double-column piers/reinforcement technology/numerical simula-tion/field test/optimization design引用本文复制引用
基金项目
国家自然科学基金(52008272)
河北省重点研发计划项目(20375410D)
河北省自然科学基金(E2022210046)
河北省省级科技计划资助(21567625H)
出版年
2024
NETL
NSTL
万方数据