Modeling and experimental implementation of infrared thermography on concrete masonry structures

Khan, Fuad; Bolhassani, Mohammad; Kontsos, Antonios; Hamid, Ahmad A.; Bartoli, Ivan

doi:10.1016/j.infrared.2015.02.001

Cited by 42 publications

(19 citation statements)

References 35 publications

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“…12b). 12 Effect of reinforcement details on load-displacement curves 16 The location of columns and beams was selected based on center line of grouted cells. This Linear elastic analysis based on uncracked section properties revealed a 57% increase in stiffness that is in close agreement with the experimental finding.…”

Section: Wall Stiffnessmentioning

confidence: 99%

“…The vast majority of reinforced masonry constructions in the mid-western and eastern parts of the US are partially grouted (PG). However, because of relatively limited research, with notable exceptions including [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], and [12] into the behavior of this type of wall, their lateral in-plane behavior, important for seismic actions, is not fully understood.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of lateral in-plane capacity of partially grouted concrete masonry shear walls

Bolhassani

Hamid

Moon

2016

Engineering Structures

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The goal of the research presented herein is to investigate a new approach to the reinforcement of partially grouted walls, double side-by-side reinforced cells, in order to enhance the seismic performance of such walls. Specifically, the results from the destructive tests of three cantilever full-scale square masonry shear walls are presented. The control wall was constructed using the conventional single cell reinforcement (SR) approach, with the remaining two walls constructed using double cell reinforcement with bond beams (DR), and with the addition of bed-joint reinforcement (DR-JR), respectively. To permit direct comparison, the total amount of reinforcement in the SR and DR walls was held constant. The experimental investigation indicated that the DR reinforcement approach resulted in significantly improved lateral in-plane response compared to the conventional SR approach.Specifically, the DR wall exhibited a 34% increase in shear capacity and 47% increase in displacement ductility. To investigate the effect of grouting on the response of proposed reinforcement details a numerical modeling technique was developed based on the infilled-frame concept and calibrated with the experimental behavior of considered walls. It is evident from the results of numerical modeling that response of walls is in a good agreement with the behavior observed in the experiments. Numerical model showed that the behavior of grouted and ungrouted parts of PG walls are similar to a frame and an infilled, respectively. Grouting double side-by-side cells enhances the frame action of grouted masonry parts and also provides a better confinement for the infilled masonry. As a result of the strengthened frame the performance of wall DR was improved significantly compared to wall SR.

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Section: Wall Stiffnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of lateral in-plane capacity of partially grouted concrete masonry shear walls

Bolhassani

Hamid

Moon

2016

Engineering Structures

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“…The material property plays a very important role in determining the temperature distribution and the thermal stresses induced [39,40]. The physical and thermal properties of the ceramic sample used in the present analysis are given in [35].…”

Section: Fe Analysismentioning

confidence: 99%

Ceramics and defects

Сфарра

Perilli

Paoletti

et al. 2015

J Therm Anal Calorim

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The feasibility of square-pulsed thermography nondestructive testing for the detection of defects in one ceramic material sample has been carried out by finite element (FE) analysis. In particular, a ceramic plate containing defects of different diameters, depths, locations, nature, and shapes has been numerically investigated by means of Comsol Ò Multiphysics computer program, taking into account the results coming from both a MATLAB TM script and the infrared thermography (IRT) technique. Indeed, the FE method simulates through a 3D model the heat transfer process induced into the ceramic material by two halogen lamps that have been applied in order to provoke an optimum thermal stress. Moreover, further defects like cracks arose beneath the surface of the plate due to the shrinkage process, have been discovered, and contrasted using a non-usual segmentation algorithm that when correlated in the time to IRT data simulates the thermo-elastic effect. Following the non-direct procedure proposed, both the depth of each defect and its main dimensions have been retrieved into a satisfactory accuracy.

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“…delamination, voids) detection of the concrete structure has been developed for decades. The real-world implementation could relate to bridge deck inspection for delamination and concrete masonry wall grouting inspection for void (Khan et al 2015). However, the performance of current practice is limited due to the heavy reliance on the environmental conditions as well as the complex environmental noises.…”

Section: Introductionmentioning

confidence: 99%

Time-Series Based Thermography on Concrete Block Void Detection

Cheng

Shen

2018

Construction Research Congress 2018

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Using thermography as a nondestructive method for subsurface detection of the concrete structure has been developed for decades. However, the performance of current practice is limited due to the heavy reliance on the environmental conditions as well as complex environmental noises. A non-time-series method suffers from the issue of solar radiation reflected by the target during heating stage, and issues of potential non-uniform heat distribution. These limitations are the major constraints of the traditional single thermal image method. Time series-based methods such as Fourier transform-based pulse phase thermography, principle component thermography, and high order statistics have been reported with robust results on surface reflective property difference and non-uniform heat distribution under the experimental setting. This paper aims to compare the performance of above methods to that of the conventional static thermal imaging method. The case used for the comparison is to detect voids in a hollow concrete block during the heating phase. The result was quantitatively evaluated by using Signal-to-Noise Ratio. Favorable performance was observed using time-series methods compared to the single image approach.

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Modeling and experimental implementation of infrared thermography on concrete masonry structures

Cited by 42 publications

References 35 publications

Enhancement of lateral in-plane capacity of partially grouted concrete masonry shear walls

Enhancement of lateral in-plane capacity of partially grouted concrete masonry shear walls

Ceramics and defects

Time-Series Based Thermography on Concrete Block Void Detection

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