Improvements of the Ultrasonic Tomography for Applications to Historical Masonry Constructions

Camassa, Domenico; Castellano, Anna; Fraddosio, Aguinaldo; Piccioni, Mario Daniele

doi:10.1007/978-3-319-99441-3_48

Cited by 11 publications

(6 citation statements)

References 6 publications

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“…Modern devices for ultrasound tomography increase the measuring accuracy as the elastic wave is induced by a multi-head antenna equipped with many independent ultrasonic transducers. This is why efforts have been made to detect reinforcement using this method [27][28][29][30][31][32].…”

Section: Potential Of Non-destructive Tests For Detecting the Reinfor...mentioning

confidence: 99%

The Use of Non-Destructive Testing (NDT) to Detect Bed Joint Reinforcement in AAC Masonry

2020

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Detecting non-metallic reinforcement made of FRP (Fibre Reinforced Polymers) can be problematic, particularly at the stage of work inspection and constructional evaluation. In contrast to steel reinforcement, detecting non-metallic reinforcement is difficult using NDT (Non-Destructive Testing) techniques. These difficulties mainly arise from considerably lower density, radiation resistance or electromagnetic impedance and cross-section of rebars when compared to steel reinforcement. Specific problems with the reinforcement detection are experienced in masonry structures, in which reinforcement is laid in bed joints. Measurements are made on a masonry face in the plane perpendicular to the reinforcement plane, and not the parallel one compared to reinforced concrete structures. Thus, the interpretation of results obtained from NDT can be complicated due to many physical phenomena occurring during tests, methods of presenting measurements and their accuracy. This paper compares different testing techniques used to detect non-metallic reinforcement in the masonry wall made of autoclaved aerated concrete (AAC). For the purpose of the tests, fibreglass and basalt meshes, traditional steel trusses and steel wire meshes were placed in bed joints of the masonry wall. An ultrasonic tomography and GPR (Ground-Penetrating Radar) scanner operating within a broad range of frequencies were used for the tests. We also used the electromagnetic device to detect metal meshes. As expected, the tests confirmed problems with detecting the non-metallic reinforcement. Only the radar method was effective in detecting the non-metallic method, whereas other methods failed. The electromagnetic method detected only the steel reinforcement in the masonry.

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Section: Potential Of Non-destructive Tests For Detecting the Reinfor...mentioning

confidence: 99%

The Use of Non-Destructive Testing (NDT) to Detect Bed Joint Reinforcement in AAC Masonry

2020

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“…Due to the high vulnerability to damage, masonry constructions must be preserved and safeguarded over time. Appropriate conservation and restoration interventions require suitable investigation procedures (Binda et al, 2000), which mainly involves non-destructive techniques (Carpinteri et al, 2007;Ramos et al, 2010a;Castellano et al, 2015;Castellano et al, 2016;Camassa et al, 2019;Camassa et al, 2020;Pallarés et al, 2021). Among them, modal testing has the very appealing feature of monitoring the global response of a structure.…”

Section: Introductionmentioning

confidence: 99%

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Camassa

Vaiana

Castellano

2023

Front. Built Environ.

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Modal testing is one of the most effective experimental techniques for the structural health monitoring of masonry constructions, as it provides useful information for the calibration of structural models and for the assessment of structural damage. However, the application of modal testing to masonry constructions is sometimes hindered by the complexity of the conventional experimental set-up, which is generally based on contact sensors. In order to overcome this issue, several researchers are exploring the application of the ground-based radar interferometry, which is an increasingly popular measurement technique for remotely monitoring displacement and vibration of structures. Given the recently increasing number of articles on this subject, here we propose a mini review on the most significant works dealing with the application of ground-based radar interferometry for modal testing of masonry constructions. In particular, we show the current state of the art and highlight the main research gaps with the purpose of assessing the effectiveness of ground-based radar interferometry for the structural health monitoring of these constructions. Our mini review is primarily aimed at engineers and scientists who already know about modal testing and radar interferometry technique and are interested in the specific application to masonry constructions.

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“…The Structural Health Monitoring (SHM) consists of a set of experimental techniques, data acquisition methods and mechanical models that have the purpose of evaluating the state of health of a structure in a continuous way, even in operating conditions [3]- [5]. Traditional monitoring systems require the installation of an adequate number of accelerometric sensors on structures in order to identify structural parameters, global or local, useful for identifying potential damage [6]- [11]. Although the high reliability and accuracy of these traditional sensors, they also have a number of limitations related to the need to have direct contact with the structure as well as long installation times.…”

Section: Introductionmentioning

confidence: 99%

Dynamic damage characterization of slender masonry structures by radar interferometry: a case study

Camassa,

Castellano,

Chiapperino

et al. 2023

Acta IMEKO

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The work shows an experimental and numerical investigation on the dynamic identification of damage in slender masonry structures using the innovative remote sensing technique of ground-based radar interferometry. The case study concerns San Cataldo’s masonry lighthouse, which is located in Puglia (Italy). Here, we experimentally determine the natural frequencies of the lighthouse by carrying out Ambient Vibration Tests (AVT) using an interferometric radar system. Starting from the experimental results, we calibrate a numerical model of the structure and study the sensitivity of the first natural frequencies of the model to five possible damage scenarios involving different parts of the structure and different degrees of damage. Comparing numerical and experimental results, we show that the interferometric radar can be effectively applied to detect damage involving the lower part of the structure.

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Improvements of the Ultrasonic Tomography for Applications to Historical Masonry Constructions

Cited by 11 publications

References 6 publications

The Use of Non-Destructive Testing (NDT) to Detect Bed Joint Reinforcement in AAC Masonry

The Use of Non-Destructive Testing (NDT) to Detect Bed Joint Reinforcement in AAC Masonry

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Dynamic damage characterization of slender masonry structures by radar interferometry: a case study

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