Monitoring early-age strain and temperature distributions in full-scale steel-concrete composite beams with distributed fiber optic sensors

Yi Bao, Matthew Hoehler, Lisa Choe, Matthew A. Klegseth, Genda Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Concrete is subject to temperature gradients and shrinkage-induced strain during curing. Strain variations in concrete can lead to residual stresses and cracks, in particular when the deformation of concrete is restrained. This in turn can affect the mechanical performance and durability of the structure. In this study, a fullydistributed fiber optic sensor is used to monitor the early-age temperature and strain distributions in a 12.8 m long steel-concrete composite beam based on pulse pre-pump Brillouin optical time domain analysis. Telecommunication-grade, single-mode optical fibers were embedded in the concrete of the specimen that consisted of lightweight aggregate concrete on trapezoidal metal deck acting compositely with a steel I-beam via headed shear studs. Emphases were placed on characterizing the temperature and strain distributions in concrete and understanding the effects of composite action on the evolution of strains in the concrete. Non-uniform strain distributions were successfully measured from the distributed fiber optic sensors in the first two days of curing. The spatial distribution of temperatures along the beam was relatively uniform but varied in amplitude due to the hydration reactions. The strain distributions were non-uniform, which is likely due to concrete cracking as the result of restrained shrinkage of the concrete.

Original languageEnglish
Title of host publicationStructural Health Monitoring 2017
Subtitle of host publicationReal-Time Material State Awareness and Data-Driven Safety Assurance - Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017
EditorsFu-Kuo Chang, Fotis Kopsaftopoulos
Pages1488-1495
Number of pages8
ISBN (Electronic)9781605953304
DOIs
StatePublished - 2017
Event11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017 - Stanford, United States
Duration: 12 Sep 201714 Sep 2017

Publication series

NameStructural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance - Proceedings of the 11th International Workshop on Structural Health Monitoring, IWSHM 2017
Volume1

Conference

Conference11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017
Country/TerritoryUnited States
CityStanford
Period12/09/1714/09/17

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