老河口汉江铁路特大桥成桥静动力性能试验研究.pdf

第7卷第6期
铁道科学与工程学报
Vol 7 No6
2010年12月
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
Dec.2010
老河口汉江铁路特大桥成桥静动力性能试验研究
黄海霄,方淑君,陈科键,尹钱求
(中南大学土木建筑学院,湖南长沙410075
摘要:为了保证桥梁使用的可靠性,检验桥梁结枘的承载能力及其工作状况,对老河口汉江铁路特大桥进行成桥静动载
试验。静載试验分3种荷載工況,对每种工況均测试了关键截面的应カ及挠度。动载试验对列车以不同速度过桥时墩顶
及跨中截面的横向振动位移进行了量测,并测试了跨中截面的竖向动挠度。通过脉动试验,对全桥的自振频率、振型及阻
尼比进行了量测。通过对实测结果和理论计算结果及规范的比较分析,表明该桥的强度、竖向及横向刚度均满足设计及规
范要求,桥梁处于良好的工作状态。进行的试验及分析对同类桥型具有借鉴意义。
关键词:铁路逹续箱梁;静动載试验;性能评价;动力特性
中图分类号:U448.2113
文献标志码:A
文章编号:1672-7029(2010)06-0030-05
Static and dynamic experiment of the behavior of the constructed Hanjiang
super-major railway bridge in Laohekou
HUANG Hai-lei FANG Shu-jun, CHEN Ke-jian, YIN Qian-qiu
School of Civil Engineering and Architecture, Central South University, Changsha 410075, China
Abstract: A static and dynamic load test is carried out on the constructed Hanjiang Super-major Railway Bridge
in laohekou with to ensure the reliability of the bridge and test the carrying capacity and working condition of the
bridge structure. The static load test was divided into three kinds of loading conditions, each of which tests the
stress and deflection of the key sections of the brid e. The transverse vibration displacement of the piers and mid
span section was measured in the dynamic load test when the train is crossing the bridge at different speeds
and the vertical dynamic deflection of the mid-span section was also tested. The natural vibration frequency
the vibration types and the damping ratio of the whole bridge were measured in the pulsating experiment
Through the comparative analysis of the experimental results and the theoretical calculation results and standard
it can be concluded that the strength, the vertical and lateral stiffness of the bridge meet the requirements of both
the design and specifications, and that the bridge is in a good working condition. The test and the analysis of the
experimental results of the bridge can serve as a reference to the bridges of the same type
Key words: railway continuous box beam; static and dynamic load experiment; performance evaluation; dynamic
characteristics
工程概况
求,采用一联(68+2x12+68)m变高度变截面
预应力混凝土连续箱粱跨越,箱梁横截面为单箱单
老河口汉江铁路特大桥是国家规划建设的沪室,中支点处梁高8.4m,跨中合拢段及边跨直线
汉蓉通道和襄渝线增建第二线的重点工程。全桥段梁高4.8m,梁底下缘采用1.8次抛物线,箱梁
长328.02m,主桥跨越汉江,为满足汉江通航要采用双向预应力体系,纵向预应力采用符合“GB
收稿日期:2010-04-22
基金项目:国家自然科学基金资助项目(50908232);中南大学前沿研究计刘资助项目(2010 QZZDO19)
作者简介:黄海雷(1984-),男,江西新余人,硬土研究生,从事桥梁结构分析研究
通讯作者:方淑君,硕士研究生导师