Long-term performance of distributed optical fiber sensors embedded in reinforced concrete beams under sustained deflection and cyclic loading
Artikel i vetenskaplig tidskrift, 2021

This paper explores the performance of distributed optical fiber sensors based on Rayleigh backscattering for the monitoring of strains in reinforced concrete elements subjected to different types of long-term external loading. In particular, the reliability and accuracy of robust fiber optic cables with an inner steel tube and an external protective polymeric cladding were investigated through a series of laboratory experiments involving large-scale reinforced concrete beams subjected to either sustained deflection or cyclic loading for 96 days. The unmatched spatial resolution of the strain measurements provided by the sensors allows for a level of detail that leads to new insights in the understanding of the structural behavior of reinforced concrete specimens. Moreover, the accuracy and stability of the sensors enabled the monitoring of subtle strain variations, both in the short-term due to changes of the external load and in the long-term due to time-dependent effects such as creep. Moreover, a comparison with Digital Image Correlation measurements revealed that the strain measurements and the calculation of deflection and crack widths derived thereof remain accurate over time. Therefore, the study concluded that this type of fiber optic has great potential to be used in real long-term monitoring applications in reinforced concrete structures.

Performance indicators

Distributed optical fiber sensing

Cyclic loading

Rayleigh backscattering

Reinforced concrete

Författare

Ignasi Fernandez

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Carlos Gil Berrocal

Thomas Concrete Group

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Rasmus Rempling

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

NCC AB

Sensors

1424-8220 (ISSN) 1424-3210 (eISSN)

Vol. 21 19 6338

Ämneskategorier

Medicinsk laboratorie- och mätteknik

Annan medicinteknik

Annan fysik

DOI

10.3390/s21196338

Mer information

Senast uppdaterat

2021-10-11