The Use of Advanced Optical Measurement Methods for the Mechanical Analysis of Shear Deficient Prestressed Concrete Members

Wilder, Kristof De; Roeck, Guido De

doi:10.1007/s40069-016-0135-x

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…All deformations and displacements of the specimens during the tests are measured by a 3-D digital image correlation equipment ARAMIS of GOM. This technique is successfully used by different researchers to study cracking and fracture behavior of concrete (De Wilder et al 2016;Nam and Lee 2015;Shah and Kishen 2011). Alternatively, a clip gauge transducer located at the notch lips and aligned with the steel bar axis could be additionally used.…”

Section: Modified Disk-shaped Compact Tension Testsmentioning

confidence: 99%

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Cifuentes

Lozano

Holušová

et al. 2017

Int J Concr Struct Mater

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A new approach for measuring the specific fracture energy of concrete denoted modified disk-shaped compact tension (MDCT) test is presented. The procedure is based on previous ideas regarding the use of compact tension specimens for studying the fracture behavior of concrete but implies significant modifications of the specimen morphology in order to avoid premature failures (such as the breakage of concrete around the pulling load holes). The manufacturing and test performance is improved and simplified, enhancing the reliability of the material characterization. MDCT specimens are particularly suitable when fracture properties of already casted concrete structures are required. To evaluate the applicability of the MDCT test to estimate the size-independent specific fracture energy of concrete (G F ), the interaction between the fracture process zone of concrete and the boundary of the MDCTspecimens at the end of the test is properly analyzed. Further, the experimental results of G F obtained by MDCT tests for normal-and high-strength selfcompacting concrete mixes are compared with those obtained using the well-established three-point bending test. The procedure proposed furnishes promising results, and the G F values obtained are reliable enough for the specimen size range studied in this work.

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Section: Modified Disk-shaped Compact Tension Testsmentioning

confidence: 99%

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Cifuentes

Lozano

Holušová

et al. 2017

Int J Concr Struct Mater

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show abstract

“…DIC measurements directly provide contour maps of surface displacements and strains by comparing the digital images of the original and deformed states of the specimen surface. In recent years, 3D-DIC has been extended to various structural applications, including full-scale gusset plate connections (Iadicola 2012), reinforced concrete beams and columns (Dutton et al 2013;Sokoli et al 2014;De Wilder et al 2016), masonry walls (Ghorbani et al 2015;Bolhassani et al 2016), and timber-framed structures (Sieffert et al 2016).…”

Section: © Ascementioning

confidence: 99%

“…Too small or too large speckles should not appear on the final speckle pattern, i.e. speckle size should be generally from 3 to 7 pixels diameter to enable the best match between two identical subsets of pixels in different deformation states, and the final pattern should look like a mix of equal-sized white and black dots (Salmanpour and Mojsilovic 2013;Freddi et al 2015;De Wilder et al 2016). If the speckle size is too large, some subsets of pixels recognized by the DIC software might be completely on a black field.…”

Section: Specimen Preparationmentioning

confidence: 99%

Vision-Based Quality Control Testing of Elastomeric Bridge Bearings

Soleimani

Konstantinidis

Balomenos

2020

Structures Congress 2020

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Elastomeric bridge bearings are widely used in bridges in order to allow deformations caused by temperature variations, traffic loading, shrinkage due to prestress or aging, and construction misalignments. However, manufacturing imperfections in these bearings (such as deviations in rubber layer thickness and non-parallel steel plates) affect their structural performance. Currently, quality control of these bearings involves destructive testing, which is costly and time consuming. This paper presents an alternative, vision-based approach for assessing the internal structure of elastomeric bridge bearings, which eliminates the need to destroy them. Threedimensional digital image correlation (3D-DIC) is used to estimate the thickness of different rubber layers and any shim rotation or distortion based on deformation patterns on the surfaces of the bearings during compression testing. 3D-DIC provides full-field measurements of displacement and strain on the surface by tracking the distribution of grayscale values of pixelbased subsets in the sequence of stereo images. The presented approach enables engineers to efficiently evaluate bearings for quality control purposes.

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“…Traditional contact measurement techniques provide limited experimental data for one or two directions at a single point mounted with an instrument. (1) These techniques have limitations in analyzing the overall shape deformation of the structure and are not suitable for measuring the entire surface of the object in which many measuring points are distributed. (2) On the other hand, the noncontact measurement technique provides the opportunity to measure a number of measuring points distributed on the object surface in 3D with reliable accuracy.…”

Section: Introductionmentioning

confidence: 99%

Intersection Point Determination of Parabolic Antenna Reflectors Using Close-range Photogrammetry

Kim¹,

Hong²

2019

Sensors and Materials

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In the construction of complex antenna structures, a number of feature points are inevitably formed on the main reflector surface of the antenna structure by bolting, riveting, cabling, and welding. In this study, the intersection point determination method using close-range photogrammetry was investigated. 3D position coordinates of many feature points distributed on the inner surface of a parabolic reflector were extracted using close-range photogrammetry. The fitting lines were estimated for the feature points arranged in the radial direction of the parabolic reflector, which tend to intersect at the center point of the reflector. The intersection point between the estimated fitting lines was calculated. The numerical variation of the intersection points on the three axes, which are accumulated through regular time-series calculations, can be used to intuitively predict and analyze not only the deformation rates but also the deformation directions for the shape of the parabolic reflector.

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The Use of Advanced Optical Measurement Methods for the Mechanical Analysis of Shear Deficient Prestressed Concrete Members

Cited by 7 publications

References 21 publications

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Modified Disk-Shaped Compact Tension Test for Measuring Concrete Fracture Properties

Vision-Based Quality Control Testing of Elastomeric Bridge Bearings

Intersection Point Determination of Parabolic Antenna Reflectors Using Close-range Photogrammetry

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