scholarly journals Developing Dynamic Digital Image Correlation Technique to Monitor Structural Damage of Old Buildings under External Excitation

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Ming-Hsiang Shih ◽  
Wen-Pei Sung
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Structural Damage ◽  
Damage Index ◽  
Correlation Method ◽  
Image Correlation ◽  
Correlation Technique ◽  
Frequency Change ◽  
External Excitation ◽  
Structural Reinforcement

The capacity of buildings to resist external excitation is an important factor to consider for the structural design of buildings. When subject to external excitation, a building may suffer a certain degree of damages, and its residual capacity to resist external excitation cannot be evaluated. In this research, dynamic digital image correlation method combined with parameter evaluation available in system identification is used to evaluate the structural capacity to resist external excitation. The results reveal possible building latent safety problems so that timely structural reinforcement or dismantling of the building can be initiated to alleviate further damages. The results of experiments using the proposed method conform to the results obtained using the conventional method, but this method is more convenient and rapid than the latter in the subsequent procedure of data processing. If only the frequency change is used, the damages suffered by the building can be detected, but the damage location is not revealed. The interstory drift mode shape (IDMS) based on the characteristic of story drift has higher sensitivity than the approximate story damage index (ADSI) method based on modal frequency and vibration type; however, both indices can be used to determine the degree and location of building damages.

Development of Digital Image Correlation Technique to Monitor Structural Damage Based on Natural Frequency as Damage Index

2011 ◽  
Vol 71-78 ◽  
pp. 3899-3903
Author(s):  
Wen Pei Sung ◽  
Ming Hsiang Shih ◽  
Feng Jen Tsai
Keyword(s):  
Digital Image Correlation ◽  
Natural Frequency ◽  
Digital Image ◽  
Structural Damage ◽  
Damage Index ◽  
Correlation Method ◽  
Cost Effective ◽  
Image Correlation ◽  
Correlation Technique ◽  
Sufficient Information

Recently, some serious earthquakes happened in the world and seriously threaten the safety of the life and property of the people. Monitoring and measuring the quakeproof capacity of building need to install high cost sensitive instruments to provide sufficient information. A cost-effective and reliable method based on the applying digital image correlation method, DIC to monitor the natural frequency of building under excitation of earthquake as damage index is proposed in this research. Using DIC to monitor the structural damage based on the natural frequency as damage index can easily detect the structural damage after the excitation of earthquake. Test results reveal that sensitivity of this DIC method is superior to traditional data collected by installed accelerometers, ACC in structure.

Analysis Accuracy of Digital Image Correlation Technique to Monitor Natural Frequency Response of Building under Dynamic Excitation

2011 ◽  
Vol 71-78 ◽  
pp. 3904-3908
Author(s):  
Ming Hsiang Shih ◽  
Wen Pei Sung ◽  
Feng Jen Tsai
Keyword(s):  
Digital Image Correlation ◽  
Frequency Response ◽  
Natural Frequency ◽  
Digital Image ◽  
Correlation Method ◽  
Cost Effective ◽  
Image Correlation ◽  
Correlation Technique ◽  
The People ◽  
External Forces

Strong typhoon and earthquake seriously threaten the safety of the life and property of the people. A cost-effective and reliable method is proposed to monitor the natural frequency response of building under excitation of external forces based on the applying digital image correlation method, DIC. The analysis accuracy of this dynamic DIC method is tested and verified by comparing with numerical analysis program, accelerometers, ACC and fast Fourier Transform, FFT. The test results reveal that the analysis accuracy of this DIC method near to the ACC and FFT traditional experimental methods. They demonstrate that using this DIC method to detect dynamic response of building under the excitation of external force has high practicability.

scholarly journals Analyzing strain in samples with all-ceramic systems using the digital image correlation technique

2019 ◽  
Vol 147 (9-10) ◽  
pp. 528-533 ◽  
Author(s):  
Ivan Tanasic ◽  
Aleksandra Mitrovic ◽  
Nenad Mitrovic ◽  
Dusan Sarac ◽  
Ljiljana Tihacek-Sojic ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Correlation Method ◽  
Region Of Interest ◽  
Experimental Models ◽  
Image Correlation ◽  
Correlation Technique ◽  
Apical Region ◽  
Maximum Strain ◽  
Significant Difference

Introduction/Objective. The study was conducted to identify the maximum strain generated in the samples composed of poly-methyl-methacrylate, StraumannR implants, and three types of ceramic systems. Methods. Three types of experimental models were used, loaded by external load of 100 N, 300 N, and 500 N and analyzed using the digital image correlation method. The models were composed of yttriastabilized zirconia, e.max lithium disilicate, and Vita EnamicR hybrid ceramics, placed on the StraumannR cylindrical dental implant systems (4 ? 10 mm) with straight abutments. Results. Significant differences in strain values between samples with different crown material groups were detected (p = 0.000). This suggests that strain values were dependent on the type of crown material. Strain values were also affected by the region of interest (p = 0.000). Application of two-way ANOVA enabled testing of the interaction effect between two independent variables, crown material and region of interest, where a significant difference was also found (p = 0.046). This indicates that strain values were also influenced by different combinations of material type and region of interest. The highest strain values were found for Z (0.383 ? 0.015) in the apical region, and the lowest for E (0.303 ? 0.015) in the middle region. Conclusion. The study shows maximum strain in the apical and marginal directions. When considered various all-ceramics, we noticed the minimum strain below Vita EnamicsR, while the maximum strain was found in samples with yttria-stabilized zirconia crown.

scholarly journals Developing Dynamic Digital Image Techniques with Continuous Parameters to Detect Structural Damage

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Ming-Hsiang Shih ◽  
Wen-Pei Sung
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Structural Damage ◽  
High Speed ◽  
Low Cost ◽  
New Technology ◽  
Correlation Method ◽  
Image Correlation ◽  
Tsunami Disaster ◽  
Damage Degree

Several earthquakes with strong magnitude occurred globally at various locations, especially the unforgettable tsunami disaster caused by the earthquake in Indonesia and Japan. If the characteristics of structures can be well understood to implement new technology, the damages caused by most natural disasters can be significantly alleviated. In this research, dynamic digital image correlation method for using continuous parameter is applied for developing a low-cost digital image correlation coefficient method with advanced digital cameras and high-speed computers. The experimental study using cantilever test object with defect control confirms that the vibration mode calculated using this proposed method can highly express the defect locations. This proposed method combined with the sensitivity of Inter-Story Drift Mode Shape, IDMS, can also reveal the damage degree of damage structure. These test and analysis results indicate that this proposed method is high enough for applying to achieve the object of real-time online monitoring of structure.

Investigation of the effect of damage on the strength of notched composite laminates by digital image correlation

2005 ◽  
Vol 40 (5) ◽  
pp. 451-461 ◽  
Author(s):  
R Ambu ◽  
F Aymerich ◽  
F Bertolino
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Residual Strength ◽  
Composite Laminates ◽  
Correlation Method ◽  
Strength Properties ◽  
Image Correlation ◽  
Correlation Technique ◽  
Digital Image Correlation Method ◽  
Full Field

In this paper the results of an experimental investigation on the effect of subcritical damage on the residual strength properties of notched composite laminates are presented. A procedure based on the digital image correlation method was applied to laminates subjected to static and fatigue tensile loading. The digital image correlation method (DICM) is a whole-field technique that calculates surface displacements and strains from digital images characterized by a random distribution of intensity grey levels. Graphite/PEEK (polyether ether ketone) and graphite/epoxy laminates with different stacking sequences were analysed and the damage progression near the stress riser was evaluated by means of the strain maps obtained by digital image correlation. It was found that damage developing before final fracture may significantly affect the structural performance of composite laminates. The digital image correlation technique allowed clarification of the beneficial or detrimental role played by the different failure mechanisms on the strain redistribution around the hole and, as a consequence, on the residual strength and fatigue life of notched samples. The findings of the investigation suggest that the DICM is an efficient and reliable tool for full-field monitoring and detailed damage characterization of structural composite elements.

The Analysis of Different Stochastic Patterns during Loading in Plastic Area Using DIC Method

2014 ◽  
Vol 611 ◽  
pp. 490-495
Author(s):  
Martin Schrötter ◽  
Martin Hagara ◽  
Matúš Kalina
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Correlation Method ◽  
Mean Value ◽  
Image Correlation ◽  
Black And White ◽  
Unloaded State ◽  
Measured Deformation ◽  
The Mean ◽  
Estimated Error

The aim of this article is to present the influence of stochastic pattern on results accuracy of digital image correlation method in plastic areas. The various types of stochastic patterns were applied on testing specimens which were then tensioned. There was correlated the intensity of black and white color (denoted as grey value) dispersed on a specimen, then the mean value of estimated error for unloaded state as well as state of highest measured deformation and finally the amount of non-correlated facets. Also the maximal deformation of specimens was compared by which the damage of stochastic pattern emerged.

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