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Analysis of fiber-optic strain-monitoring data from a prestressed concrete bridge

机译:预应力混凝土桥梁的光纤应变监测数据分析

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摘要

This paper presents data from fiber-optic strain monitoring of the Nine Wells Bridge, which is a three-span, pretensioned, prestressed concrete beam -and-slab bridge located in Cambridgeshire in the United Kingdom. The original deployment at the site and the challenges associated with collecting distributed strain data using the Brillouin optical time domain reflectometry (BOTDR) technique are described. In particular, construction and deployment issues of fiber robustness and temperature effects are highlighted. The challenges of interpreting the collected data as well as the potential value of information that may be obtained arediscussed. Challenges involved with relating measurements to the expected levels of prestress, including the effects due to debonding, creep, and shrinkage, are discussed and analyzed. This paper provides an opportunity to study whether two commonly used models for creep and shrinkage, adequately model data collected in field conditions.
机译:本文介绍了九井桥的光纤应变监测数据,该桥是位于英国剑桥郡的三跨预应力预应力混凝土梁板桥。描述了现场的原始部署以及与使用布里渊光学时域反射测量(BOTDR)技术收集分布式应变数据相关的挑战。特别要强调的是,纤维的坚固性和温度影响的构造和部署问题。讨论了解释收集的数据的挑战以及可能获得的信息的潜在价值。讨论和分析了将测量值与预期的预应力水平相关的挑战,包括由于脱粘,蠕变和收缩引起的影响。本文提供了一个机会来研究两个常用的蠕变和收缩模型,是否可以充分模拟在现场条件下收集的数据。

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