Automatic crack monitoring using photogrammetry and image processing

Valença, Jónatas; Dias-da-Costa, D.; Júlio, Eduardo; Araújo, Hélder; Costa, Hugo

doi:10.1016/j.measurement.2012.07.019

Cited by 103 publications

(78 citation statements)

References 16 publications

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“…Each beam was instrumented using traditional measurement devices to monitor load and the vertical displacements at the three points shown in Figure 1(a). The crack openings were measured for one beam during the test [30][31][32]. Figure 3 shows the load vs. displacement curves for all tested specimens and a representation of all stages monitored.…”

Section: Experimental Testsmentioning

confidence: 99%

Validation of a Discrete Crack Model for Lightweight Aggregate Concrete Beams

Dias-da-Costa¹,

Graça-e-Costa²,

Carmo³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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Section: Experimental Testsmentioning

confidence: 99%

Validation of a Discrete Crack Model for Lightweight Aggregate Concrete Beams

Dias-da-Costa¹,

Graça-e-Costa²,

Carmo³

2016

Proceedings of the VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)

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“…Before starting the test, a first image was acquired and used to establish a homography matrix that relates image coordinates (in pixel) with real-world coordinates (in mm). This matrix was used to scale and orientate all remaining images (see more details in [22]). The displacements measured during the test were then used to calculate the strain field [20,22,23] using standard finite element post-processing techniques.…”

Section: Surface Strain Calculation Using Photogrammetrymentioning

confidence: 99%

“…This matrix was used to scale and orientate all remaining images (see more details in [22]). The displacements measured during the test were then used to calculate the strain field [20,22,23] using standard finite element post-processing techniques. For this purpose, a strain-nodal displacement matrix was built for each target and used to calculate the strain [16].…”

Section: Surface Strain Calculation Using Photogrammetrymentioning

confidence: 99%

Assessing steel strains on reinforced concrete members from surface cracking patterns

Carmo

Valença

Silva

et al. 2015

Construction and Building Materials

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h i g h l i g h t sMethod to assess steel strains inside concrete members using surface measurements. This approach has non-contact and does not interfere with the bond between steel and concrete. Validation using concrete ties monitored using strain gauges placed inside the steel bars. The technique can be applied to narrow regions, surrounding a single crack, or to larger regions. Results proved the feasibility of the method. a b s t r a c tThe measurement of steel strains in reinforced concrete structures is often critical to characterise the stresses along the member. In this scope, this manuscript describes the development of a method to assess steel strains inside concrete members using solely surface measurements. These measurements were obtained using photogrammetry and image processing. The technique was validated using two concrete ties monitored with strain gauges placed inside the steel bars. The experimental results showed that one of the most important parameters affecting the accuracy of the technique is the measurement of crack widths. In comparison, the concrete strain has little effect on the final results. The technique is particularly advantageous since it is non-contact and does not impact on the bond conditions. It also does not require accessing the reinforcements. As a main conclusion, this work showed the feasibility of estimating strains inside the structure using surface measurements. This technique will benefit in the near future from further improvements namely in what concerns the camera resolution.

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“…Finalmente, un filtrado adicional permite la eliminación de valores atípicos (outliers). Varios autores, como [16][17][18][19], han hecho uso de estos métodos de procesamiento digital de la imagen para la detección y cuantificación de fisuras. El procedimiento debe ser adaptado según las características a obtener; ancho, largo, profundidad o área de la fisura, siendo esta última la más elegida para el estudio de la evolución temporal de la fisuración.…”

Section: -Introducciónunclassified

Repetitividad de la capacidad autorreparante de hormigones reforzados con fibras con aditivo cristalino

Cuenca¹,

Linares²,

Ferrara³

2018

Libro De Comunicaciones / Livro Das Comunicações

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RESUMENEl presente artículo analiza la repetitividad de la capacidad autorreparante del hormigón reforzado con fibras analizando la influencia del aditivo cristalino en la autorreparación de las fisuras. Se ha analizado la respuesta a tracción en probetas cuadradas de 150x150x50mm mediante el "Double Edge Wedge Splitting (DEWS)" test. La configuración del ensayo y las entallas de las probetas permiten prefijar el plano de rotura, y por consiguiente la orientación de las fibras. Para su autorreparación, las probetas han sido expuestas a las siguientes condiciones: inmersión en agua, ambiente externo (aire) y ciclos aire/agua. Inicialmente, las probetas fueron prefisuradas hasta una abertura de fisura de 0.25mm, posteriormente se sometieron a las distintas condiciones de exposición durante 1, 3 y 6 meses. Al final de cada periodo, las probetas fueron nuevamente fisuradas para volver a ser sometidas a las distintas condiciones de exposición durante 1 o dos meses hasta completar un año. Se ha analizado el índice de cierre de la fisura mediante métodos fotogramétricos. Para un mismo periodo de exposición, los mayores cierres de fisura tuvieron lugar en la condición de inmersión en agua. Además, se observó que el aditivo cristalino puede favorecer la autorrecuperación a largo plazo.PALABRAS CLAVE: self-healing, autorreparación, aditivo cristalino, repetitividad, HRF 1.-INTRODUCCIÓNLa creciente preocupación sobre un uso inteligente de los materiales y la necesidad de garantizar a largo plazo un estado y rendimiento óptimos, tanto a nivel estructural como de material, en las aplicaciones de ingeniería civil ha favorecido una mayor investigación acerca de nuevos materiales cementicios autorreparables. El objetivo principal de estos materiales es el de cerrar la vía de entrada (fisuras) a los agentes agresivos, de manera que el inicio de la degradación del material se retrase o se evite completamente. El hormigón tiene ciertas propiedades de autorreparación ya que, en la mayoría de los casos, el 20-30% de las partículas de cemento permanecen anhidras. Cuando se crea una fisura, dichas partículas anhidras entran en contacto con el agua o con la humedad y reaccionan con ella 405

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Automatic crack monitoring using photogrammetry and image processing

Cited by 103 publications

References 16 publications

Validation of a Discrete Crack Model for Lightweight Aggregate Concrete Beams

Validation of a Discrete Crack Model for Lightweight Aggregate Concrete Beams

Assessing steel strains on reinforced concrete members from surface cracking patterns

Repetitividad de la capacidad autorreparante de hormigones reforzados con fibras con aditivo cristalino

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