华东交通大学学报2024，Vol.41Issue(2)：48-55,8.
基于缩尺模型的高铁桥梁预应力损失试验研究
Experimental Study on Prestress Loss of Hight-Speed Railway Bridges Based on Scaled Model
摘要
Abstract
[Objective]To better evaluate the prestress loss of in-service prestressed concrete bridge structures,[Method]this article takes the 32 m prestressed concrete box girder,which is widely used in domestic high-speed railways,as the research object.26 test model beams using C50 concrete were produced by converting the box girder into a T-shaped section at a scale of 1:16.The strain and elongation of the prestressed steel strand in the experimental beam were continuously and continuously monitored to determine the actual value of prestress loss,which was then compared and analyzed with the values calculated by commonly used prestress loss calcula-tion specifications at home and abroad.[Result]The findings demonstrate that prestress loss mainly occurs in the early stage,which is instantaneous loss,accounting for about 70%of the total loss.84.6%of the anchoring losses of the experimental beam account for over 70%of the total instantaneous losses,with a maximum of 80.57%.The long-term loss of the experimental beam fluctuates dramatically in the first 10 days after anchoring and gradually stabilizes in the later stage.Comparing the calculation results of the five specifications with the measured values in the experiment,the data shows that the measured data is most consistent with the calculation re-sults of the"Code for Design of Railway Bridges and Culverts"(TB 10002-2017).[Conclusion]The research re-sults can provide reference for the calculation of prestress loss of prestressed beams in practical engineering.关键词
预应力混凝土梁/预应力损失/缩尺模型/规范对比/应变监测Key words
prestressed concrete beam/prestress loss/reduced scale model/standardized comparison/strain monitoring分类
建筑与水利引用本文复制引用
许开成,黄凌娟,李鹏清,张立卿,邱日旭,陈梦成..基于缩尺模型的高铁桥梁预应力损失试验研究[J].华东交通大学学报,2024,41(2):48-55,8.基金项目
国家自然科学基金项目(52368031,51968021) （52368031,51968021）
中国博士后科学基金项目(2022M713497) （2022M713497）
江西省自然科学基金项目(20224BAB204067) （20224BAB204067）
轨道交通基础设施性能监测与保障国家重点实验室资助项目(HJGZ2022201) （HJGZ2022201）
江西省研究生创新专项资金项目(YC2022-s506) （YC2022-s506）
