首页|基于缩尺模型的高铁桥梁预应力损失试验研究

基于缩尺模型的高铁桥梁预应力损失试验研究

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
[目的]为更好的评估在役预应力混凝土桥梁结构预应力损失状况.[方法]选用国内高铁中应用最广的32m预应力混凝土箱梁作为研究对象,按照1:16的缩尺比例将箱梁转化为T形截面制作了26根C50混凝土试验模型梁.通过对试验梁预应力钢绞线应变、伸长量的瞬时和长期监测得到预应力损失的实际值,并将此实际值与目前国内外常用预应力损失规范计算所得值进行对比分析.[结果]预应力损失主要发生在前期即瞬时损失,约占总损失的70%;84.6%的试验梁锚固损失占瞬时损失总和的70%以上,最高达80.57%;试验梁的长期损失在锚固后的前10d内变化较快,后期逐渐趋于稳定;将5种规范的计算结果与试验实测值进行对比,对于长期损失,数据显示实测数据与《铁路桥涵设计规范》(TB 10002-2017)计算结果最为吻合.[结论]研究结果可为实际工程中预应力梁的预应力损失计算提供参考.
Experimental Study on Prestress Loss of Hight-Speed Railway Bridges Based on Scaled Model
[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.

prestressed concrete beamprestress lossreduced scale modelstandardized comparisonstrain monitoring

许开成、黄凌娟、李鹏清、张立卿、邱日旭、陈梦成

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华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,江西南昌 330013

华东交通大学土木建筑学院,江西南昌 330013

预应力混凝土梁 预应力损失 缩尺模型 规范对比 应变监测

国家自然科学基金国家自然科学基金中国博士后科学基金江西省自然科学基金轨道交通基础设施性能监测与保障国家重点实验室项目江西省研究生创新专项

52368031519680212022M71349720224BAB204067HJGZ2022201YC2022-s506

2024

华东交通大学学报
华东交通大学

华东交通大学学报

CSTPCD
影响因子：0.748
ISSN：1005-0523
年,卷(期)：2024.41(2)