Development of digital image correlation method to analyse crack variations of masonry wall

Tung, Shih‐Heng; Shih, Ming‐Hsiang; Sung, Wen‐Pei

doi:10.1007/s12046-008-0033-2

Cited by 70 publications

(40 citation statements)

References 4 publications

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“…Monitoring crack development in masonry walls has important significance in the study of the earthquake resistance capability of masonry structures [3]. As seismic oscillation is an extremely complex process, the crack development mechanism of masonry structures is not clear and there is no precise mathematical model to describe the change characteristics.…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…Monocular digital photography, combining photogrammetric technique with information technology, presents an opportunity to monitor the instantaneous dynamic displacement of engineering structures by adopting a nonmetric digital camera to observe multiple points simultaneously and to capture the instantaneous displacement of a deformable object [8]. Although digital photography has not been as popular in engineering structures as in other fields such as biomechanics, chemistry, biology, and architecture, many pioneering applications in this field have demonstrated its underestimated potential, e.g., for monitoring bridge structures [9][10][11], structural cracks [12][13][14][15], and masonry wall displacements with digital image correlation (DIC) method [3,[16][17][18][19][20]. Moreover, the DIC method is also used to monitor the strain development on bricks [21].…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

See 1 more Smart Citation

Monitoring Instantaneous Dynamic Displacements of Masonry Walls in Seismic Oscillation Outdoors by Monocular Digital Photography

Zhang

Guo

et al. 2018

Mathematical Problems in Engineering

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Understanding the development of cracks in masonry walls can provide insight into their capability for earthquake resistance. The crack development is characterized by the displacement difference of the adjacent positions on masonry walls. In seismic oscillation, the instantaneous dynamic displacements of multiple positions on masonry walls can warn of crack development and reflect the propagation of the seismic waves. For this reason, we proposed a monocular digital photography technique based on the PST-TBP (photographing scale transformation-time baseline parallax) method to monitor the instantaneous dynamic displacements of a masonry wall in seismic oscillation outdoors. The seismic oscillation was simulated by impacting a suspended steel plate with a hammer and by simulation software ANSYS (analysis system), for comparative analysis. The results show that it is feasible to use a hammer to impact a suspended steel plate to simulate the seismic oscillation as the stress concentration zones of the masonry wall model in ANSYS are consistent with the positions of destruction on the masonry wall, and that the crack development of the masonry wall in the X-direction could be characterized by a sinusoid-like curve, which is consistent with previous studies. The PST-TBP method can improve the measurement accuracy as it corrects the parallax errors caused by the change of intrinsic and extrinsic parameters of a digital camera. South of the test masonry wall, the measurement errors of the PST-TBP method were shown to be 0.83mm and 0.84mm in the X-and Z-directions, respectively, and in the west, the measurement errors in the X-and Z-directions were 0.49mm and 0.44mm, respectively. This study provides a technical basis for monitoring the crack development of the real masonry structures in seismic oscillation outdoors to assess their safety and has significant implications for improving the construction of masonry structures in earthquake-prone areas.

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Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

Monitoring Instantaneous Dynamic Displacements of Masonry Walls in Seismic Oscillation Outdoors by Monocular Digital Photography

Zhang

Guo

et al. 2018

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…Nevertheless, at the authors' knowledge, the number of experimental studies combining civil engineering structures and DIC technique is limited. They concern small structures (see [6,7] for instance) or larger ones (see [8][9][10] for instance), although most of them concern models of civil engineering structures or parts of them. Very few experiments have been performed on full scale structures, in laboratory or in situ (see [11]).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cracks and Deformations in a Full Scale Reinforced Concrete Beam Using a Digital Image Correlation Technique

2010

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This paper deals with the use of a digital image correlation technique for the determination of the actual mechanical behaviour of a full scale reinforced concrete beam after 25 years of service in a severe industrial environment. The objective is to investigate the influence of the service conditions on the cracking process and the flexural behaviour of the beam. For this purpose, one beam is removed from the existing structure before being tested in four point bending in laboratory. Displacement fields derived from digital images captured during five loading cycles are analysed in terms of crack detection and measurement, beam deflection and curvature. Owing to its good resolution, the method proves suitable for early crack detection and measurement. A comparison between experimental results and theoretical values derived from Eurocode 2 design code in the serviceability state suggests the existence of a longitudinal compressive force in the beam. A complementary analysis confirms the validity of this hypothesis. It is concluded that the cracking and the flexural behaviour of the tested beam are significantly affected by the existence of an initial compressive stress, which is possibly resulting from a swelling of the concrete due to long term exposure to wet atmosphere and elevated temperature.

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“…For the application of DIC analysis in crack problem, Dost et al (1999Dost et al ( , 2003 acquired images of nanoscale objects using an atomicforce microscope to detect nano-scale cracks forming on nanomaterials. Additionally, Tung et al (2008) inspected crack development in a masonry wall and examined the effect of crack formation on seismic resistance of masonry structures. The validity of applying DIC technique in crack observation for non-homogeneous materials was confirmed by their studies.…”

Section: Introductionmentioning

confidence: 99%

Application of digital-image-correlation techniques in analysing cracked cylindrical pipes

Tung

Sui

2010

Sadhana

Self Cite

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Cracks induced by external excitation on a material that has defects may generate the stress concentration phenomenon. The stress concentration behaviour causes local budding, which will induce the damage of the members made of this material. Thus, developing techniques to monitor the strain variation of a cracked member is an important study. The traditional technique (such as strain gauge) can only measure the average strain of a region. The strain variation within this region cannot be determined. Therefore, it cannot sufficiently reflect the mechanical behaviour surrounding the crack. The Digital image correlation technique recently developed is an image identification technique to be applied for measuring the object deformation. This technique is capable of correlating the digital images of an object before and after deformation and further determining the displacement and strain field of an object based on the corresponding position on the image. In this work, this technique is applied to analyse the mechanics of a cylindrical pipe experiencing crack destruction. The fixing device is used to avoid shaking the specimen during the pressurizing process. The image capture instruments are fixed on the stable frame to measure the deformation of specimen accurately. Through the cylindrical pipe cracking test, the capacity of the digital image correlation technique for surveying the strain variation in a tiny region is validated. Then, the experimental results obtained using the digital image correlation analysis is used to demonstrate the crack development tendency in defect materials and the stress concentration zone

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Development of digital image correlation method to analyse crack variations of masonry wall

Cited by 70 publications

References 4 publications

Monitoring Instantaneous Dynamic Displacements of Masonry Walls in Seismic Oscillation Outdoors by Monocular Digital Photography

Monitoring Instantaneous Dynamic Displacements of Masonry Walls in Seismic Oscillation Outdoors by Monocular Digital Photography

Analysis of Cracks and Deformations in a Full Scale Reinforced Concrete Beam Using a Digital Image Correlation Technique

Application of digital-image-correlation techniques in analysing cracked cylindrical pipes

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