Combined application of distributed fibre optical and digital image correlation measurements to structural concrete experiments

Mata‐Falcón, Jaime; Haefliger, Severin; Lee, Minu; Galkovski, Tena; Gehri, Nicola

doi:10.1016/j.engstruct.2020.111309

Cited by 70 publications

(64 citation statements)

References 27 publications

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“…As it is easily discernible, the integration of this technique inside a DOFS monitoring campaign not only does not lead to any interference but also allows to integrate, verify and validate the DOFS internally measured strains with externally measured ones. Two recent studies, Mata-Falcón et al [ 54 ] and Bado et al [ 55 ], explicitly analyzed this DOFS-DIC integration.…”

Section: Laboratory Experimental Applicationsmentioning

confidence: 99%

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A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

Bado

Casas

2021

Sensors

240

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The present work is a comprehensive collection of recently published research articles on Structural Health Monitoring (SHM) campaigns performed by means of Distributed Optical Fiber Sensors (DOFS). The latter are cutting-edge strain, temperature and vibration monitoring tools with a large potential pool, namely their minimal intrusiveness, accuracy, ease of deployment and more. Its most state-of-the-art feature, though, is the ability to perform measurements with very small spatial resolutions (as small as 0.63 mm). This review article intends to introduce, inform and advise the readers on various DOFS deployment methodologies for the assessment of the residual ability of a structure to continue serving its intended purpose. By collecting in a single place these recent efforts, advancements and findings, the authors intend to contribute to the goal of collective growth towards an efficient SHM. The current work is structured in a manner that allows for the single consultation of any specific DOFS application field, i.e., laboratory experimentation, the built environment (bridges, buildings, roads, etc.), geotechnical constructions, tunnels, pipelines and wind turbines. Beforehand, a brief section was constructed around the recent progress on the study of the strain transfer mechanisms occurring in the multi-layered sensing system inherent to any DOFS deployment (different kinds of fiber claddings, coatings and bonding adhesives). Finally, a section is also dedicated to ideas and concepts for those novel DOFS applications which may very well represent the future of SHM.

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Section: Laboratory Experimental Applicationsmentioning

confidence: 99%

“… Crack locations and openings, steel stresses and forces in front layers of stirrups for Panel 1 at ( a ) 80 kN and ( b ) 110 kN as well as for Panel 2 at ( c ) 90 kN and ( d ) 150 kN [ 54 ]. …”

Section: Figurementioning

confidence: 99%

A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

Bado

Casas

2021

Sensors

240

View full text Add to dashboard Cite

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“…Recently, a notable step forward has been performed with respect to tracking of the displacement field in the concrete surface, [31][32][33][34] as well as measurements of rebar strains. [33][34][35][36][37] These tools allowed for new insights on the response of concrete members, showing the complexity of the interactions between reinforcement and the surrounding concrete as well as the influence of compatibility of deformations on their response.…”

Section: Measurement Techniquesmentioning

confidence: 99%

Shear force redistributions and resistance of slabs and wide beams

Cantone

Ruiz

Muttoni

2021

Structural Concrete

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Redistribution of shear forces in reinforced concrete members without shear reinforcement is a key aspect for the assessment of the shear capacity of wide beams and slabs. Such redistributions are due to the nonlinear response of reinforced concrete (both in bending and shear) and have the potential to significantly modify the internal forces during loading. This phenomenon allows in many cases, as for slabs linearly supported and subjected to concentrated forces, to increase the level of load even when some regions have already attained their local shear resistance. This work introduces the results of an experimental programme performed on three cantilever slabs subjected either to strip loads or to concentrated loads. Shear redistributions close to failure are investigated on the basis of refined measurements performed on the concrete surface and on the reinforcement bars. The results show the significance of several mechanical parameters, as well as how shear redistributions occur when some regions are in softening (post-peak behavior) while others have still not attained their local shear resistance. On this basis, a comprehensive approach is presented for determining the redistributions of internal forces and to predict the shear capacity of reinforced concrete slabs subjected to concentrated loads near linear supports. The performance of such approach is eventually validated against test data and practical recommendations are proposed for design and assessment.

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“…In addition to the aforementioned permanently installed measuring equipment, two independent measurement systems are used in all tests, namely Digital Image Correlation (DIC) and distributed fibre-optic measurements (FO). For a detailed overview of the capabilities and limitations of the independent measurement systems the reader is referred to [2].…”

Section: Measurement Elementsmentioning

confidence: 99%

Diseño, Construcción y Capacidades del Large Universal Shell Element Tester

Alexander

Kaufmann²,

Karagiannis³

et al. 2020

hya

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For the safe design of new concrete structures, models based on the plasticity theory are perfectly suitable. Hence, these models have been adopted by many design codes worldwide in the last decades. However, the application of plasticity theory methods is hardly ever possible in structures built following older design codes, especially if ageing infrastructure objects need to be reassessed today in order to ensure their structural safety, usually for increased traffic intensity compared to the time of construction. The investigation of the performance of the ageing infrastructure in the context of structural safety, particularly for shear and combined loading, was the starting point to build a new testing facility in the structural laboratory at ETH Zurich, the Large Universal Shell Element Tester (LUSET). The LUSET enables the possibility to investigate the load-deformation behaviour of large reinforced concrete plate elements under arbitrary loading conditions. This means, that the LUSET allows applying all eight independent stress resultants in any combination and independent of the loading path. Thus, the conducted experiments on shell elements allow for (i) the investigation of the deformation capacity of structural concrete subjected to in-plane loading, (ii) the exploration of the limits of applicability of the theory of plasticity to structural concrete also with low amounts of reinforcement and (iii) the critical review of current design provisions and available models. The development of the LUSET took place over a period of more than a year and the designers tried to fulfil all the set goals for its construction. However, compromises regarding the complexity (as universal as possible), capacities (to be maximised), costs (to be minimised) and geometrical boundary conditions (as big as possible) had to be made and were weighed up against each other. This paper presents the design and construction process of the LUSET and describes its testing possibilities and capacities.

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Combined application of distributed fibre optical and digital image correlation measurements to structural concrete experiments

Cited by 70 publications

References 27 publications

A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

Shear force redistributions and resistance of slabs and wide beams

Diseño, Construcción y Capacidades del Large Universal Shell Element Tester

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