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Material Test on Strain Fracture and Crack Opening Displacement Based on Digital Image Correlation Method

& Materials, 710:83-90, 2014. 6. X. Qian, S. Zhang, S. Swaddiwudhipong, et al. Temperature dependence of material length scale for strain gradient plasticity and its effect on near-tip opening displacement. Fatigue & Fracture of Engineering Materials & Structures, 37(2):157-170, 2014. 7. R. Ghorbani, F. Matta, M. A. Sutton. Full-Field Deformation Measurement and Crack Mapping on Confined Masonry Walls Using Digital Image Correlation. Experimental Mechanics, 55(1):227-243, 2014. 8. Chu et al. Applications of digital-image-correlation

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Correlation between Compressive Strengths and Water Absorption of Fly Ash Cement Mortar Immersed in Water

Abstract

The compressive strength and water absorption of cement mortars with different water-binder ratio (0.35, 0.45 and 0.55) and fly ash content (0, 10%, 20% and 30%) under water immersion were investigated, and the correlation between them was further analyzed. The internal microstructure and phase composition of mortar was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The results show that the inside of mortar mixed with fly ash displayed the loose and porous microstructure. Therefore, the incorporation of fly ash reduced the compressive strength of mortar, especially the early strength, and the strength decreased with the increase of fly ash content, and the water absorption of mortar also increased. There was a linear correlation between the compressive strength and water absorption of mortar with the equation: f c = −3.838β + 62.332, where f c and β represented the compressive strength and water absorption, respectively. Therefore, when the water absorption of mortar immersed in water was measured, its corresponding compressive strength could be preliminarily inferred through this equation, which was of great significance for detecting and identifying the stability and safety of hydraulic structures.

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Digital Image Correlation Systems in the Experimental Investigations: Capabilities and Limitations

połączeń elementów konstrukcji stosowanych w lotnictwie”. Doctoral Thesis. RUT, 2015. 5. D.M. Revilock, J.C. Thesken, T.E. Schmidt, B.S. Forsythe, “Three-Dimensional Digital Image Correlation of a Composite Overwrapped Pressure Vessel During Hydrostatic Pressure Test” Technical Report NASA, 2007. 6. B. Goszczyńska, W. Trąmpczyński , J. Tworzewska, P. Tworzewski, “Doświadczalna analiza odkształceń przestrzennych belek żelbetowych z zastosowaniem skanera optycznego 3D”, Inżynieria i Budownictwo: Vol. 70, No. 3, 156-159, 2014. 7. B. Goszczyńska, J

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A Novel Three-Head Ultrasonic System for Distance Measurements Based on the Correlation Method

References [1] Zhao, X., Luo, Q., Han, B. (2009). A novel ultrasonic ranging system based on the self-correlation of pseudo-random sequence. In International Conference on Information and Automation (ICIA '09) . IEEE, 1124-1128. [2] Granja, F., Jimenez, A.R. (2006). Ultrasound modulation and codification for localization systems. In New Acoustics: Selected Topics II . Biblioteca de Ciencias, 167-186. [3] Xie, Q., Cheng, S., Lu, F. (2013). Partial discharge location in oil using ultrasonic phased array. Przegląd Elektrotechniczny , 89 (3b), 84

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Measurement Uncertainty Evaluation Method Considering Correlation and its Application to Precision Centrifuge

-Carlo simulation. Talanta , 64, 415-422. [16] Pertile, M., De Cecco, M. (2008). Uncertainty evaluation for complex propagation models by means of the theory of evidence. Measurement Science and Technology , 19, 1-10. [17] Wubbeler, G., Harris, P.M., Cox, M.G., et al. (2010). A two-stage procedure for determining the number of trials in the application of a Monte Carlo method for uncertainty evaluation. Metrologia , 47, 317-324. [18] Li, S.T., Hammond, J.L. (1975). Generation of pseudo random numbers with specified univariate distributions and correlation coefficients

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Performance Evaluation on Selection of Formwork Systems in High Rise Buildings Using Regression Analysis and Their Impacts on Project Success

Abstract

The selection of the formwork system for high rise building affects the entire construction project duration and cost. The study reports the factors influencing the selection of different formwork system in the construction of high rise buildings through structural questionnaire survey from the client, contractor, consultant, and interviews with expert members. Total of 40 technical factors was identified from the literature and 220 filled questionnaires were received from the respondent. Relative Importance Index method is used to find the topmost factors affecting the selection of formwork system. Additionally, from factor analysis 22 factors were identified to have a correlation with one another. Regression analysis reveals that duration of the project, maintenance cost, adaptability, and safety have impact on formwork selection across time, cost and quality. These findings could potentially increase the construction company’s existing knowledge in relation to formwork selection.

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Image Reconstruction Method with the Exploitation of the Spatial Correlation for Electrical Capacitance Tomography

Abstract

Electrical capacitance tomography (ECT) is considered to be a competitive measurement method. The imaging objects in ECT measurements are often in a time-varying process, and exploiting the prior information related to the dynamic nature is important for reconstructing high-quality images. Different from existing reconstruction models, in this paper a new model that incorporates the spatial correlation of the pixels by introducing the radial basis function (RBF) method, the dynamic behaviors of a timevarying imaging object, and the ECT measurement information is proposed to formulate the dynamic imaging problem. An objective functional that exploits the spatial correlation of the pixels, the combinational regularizer of the first-order total variation (FOTV) and the second-order total variation (SOTV), the multi-scale regularization, the spatial constraint, and the temporal correlation is proposed to convert the ECT imaging task into an optimization problem. A split Bregman iteration (SBI) method based iteration scheme is developed for solving the proposed objective functional. Numerical simulation results validate the superiority of the proposed reconstruction method on the improvement of the imaging quality.

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Estimating the Safety Performance Function for Urban Unsignalized Four-Legged One-Way Intersections in Palermo, Italy

-2012. 13. O. GIUFFRÈ, A. GRANÀ, T. GIUFFRÈ, R. MARINO, Improving reliability of road safety estimates based on high correlated accident counts, Transportation Research Record, 2019, 197-204, 2007. 14. O. GIUFFRÈ, A. GRANÀ, F. CORRIERE, R. MARINO, Handling under-dispersion in calibrating Safety Performance Function at urban, four-leg, signalized intersections, Journal of Transportation Safety & Security, 3, 3, 174-188, 2011. 15. O. GIUFFRÈ, A. GRANÀ, T. GIUFFRÈ, R. MARINO, Accounting for Dispersion and Correlation in Estimating Safety

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Significance Risks Evaluation of Commercial Construction Projects

Abstract

The main objective of the article is to present quantified and measurable risks likelihood appearance, impact and significance of inspected and monitored 48 commercial construction projects and their feasibility to be carried out. Original technical, financial and organisational feasibility studies in compliance with a rigorous Bank Investment Supervision requirements have been executed by the author in the period of 2005 – 2018. Methodology of construction project appraisal for financing and execution professional preparation have been laid out – technical documentation, arrangements, realisation. Analysis and assessment of Bank Investment Supervision consisted of project execution plan PEP, geotechnical and environmental conditions, permit design, agreements and decision impacts of local authorities, engineering contract for construction works, project insurance and performance bonds, schedule of execution tasks and their costs, payment plan, investment budget and project economical effectiveness, scope of monthly construction works execution assessed by Earned Value Method approach and handover procedure of construction project. An attempt was made to express numerically the relationship between risks impacts and their level of likelihood. Also, a method of associating the influence of projects risks impacts on the extent of the likelihood of project risk occurrence which makes possible to determine the direction and the strength of this relationship was presented. Finally, risks likelihood appearance, impact and significance variability of commercial construction projects within last two years of booming investment industry have been determined.

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DIC in Validation of Boundary Conditions of Numerical Model of Reinforced Concrete Beams Under Torsion

REFERENCES 1. ATENA Program Documentation, Theory, Praga, 2017. 2. Buda-Ożóg L., “Assessment of Stiffness Beams Subjected to Combined Shear and Torsion Designed Using STM”, Procedia Engineering, Vol. 193: 152-159, 2017. 3. Buda-Ożóg L., Skrzypczak I., Kujda J., “Cracks analysis in the reinforced concrete pipes”, The Baltic Journal of Road and Bridge Engineering, Vol. 12, No. 2: 88-93, 2017. 4. Chu T.C., Ranson W.F., Sutton M.A., Peters W.H., “Applications of Digital-Image-Correlation Techniques to Experimental Mechanics”, Experimental

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