In situ assessment of structural timber elements of a historic building by infrared thermography and ultrasonic velocity

Kandemir-Yücel, A.; Tavukçuoğlu, Ayşe; Caner-Saltık, Emine N.

doi:10.1016/j.infrared.2006.06.012

Cited by 73 publications

(28 citation statements)

References 11 publications

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“…Given the emergency context and the Volterra walls' length and height, IRT allowed for rapidly inspecting the entire city wall enclosure providing remote data acquisition over large areas with high device portability, logistic versatility, fast and easy data-processing time, and safety of the operator. Given these advantages IRT was considered a suitable technique with respect to other time-consuming, expensive and destructive methods, such as gravimetric direct measures, ground-penetrating radar [67] and ultrasonic velocity measurements [68], which on the contrary can provide data necessarily limited to a small number of control points/areas. Following the first thermographic survey (performed on 2 December 2014 after a rainy period; Figure 3), dry conditions were assessed along the entire wall enclosure, with the exception of some sectors where thermal anomalies were detected.…”

Section: Discussionmentioning

confidence: 99%

Detecting Slope and Urban Potential Unstable Areas by Means of Multi-Platform Remote Sensing Techniques: The Volterra (Italy) Case Study

2016

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Volterra (Central Italy) is a town of great historical interest, due to its vast and well-preserved cultural heritage, including a 2.6 km long Etruscan-medieval wall enclosure representing one of the most important elements. Volterra is located on a clayey hilltop prone to landsliding, soil erosion, therefore the town is subject to structural deterioration. During 2014, two impressive collapses occurred on the wall enclosure in the southwestern urban sector. Following these events, a monitoring campaign was carried out by means of remote sensing techniques, such as space-borne (PS-InSAR) and ground-based (GB-InSAR) radar interferometry, in order to analyze the displacements occurring both in the urban area and the surrounding slopes, and therefore to detect possible critical sectors with respect to instability phenomena. Infrared thermography (IRT) was also applied with the aim of detecting possible criticalities on the wall-enclosure, with special regards to moisture and seepage areas. PS-InSAR data allowed a stability back-monitoring on the area, revealing 19 active clusters displaying ground velocity higher than 10 mm/year in the period 2011-2015. The GB-InSAR system detected an acceleration up to 1.7 mm/h in near-real time as the March 2014 failure precursor. The IRT technique, employed on a double survey campaign, in both dry and rainy conditions, permitted to acquire 65 thermograms covering 23 sectors of the town wall, highlighting four thermal anomalies. The outcomes of this work demonstrate the usefulness of different remote sensing technologies for deriving information in risk prevention and management, and the importance of choosing the appropriate technology depending on the target, time sampling and investigation scale. In this paper, the use of a multi-platform remote sensing system permitted technical support of the local authorities and conservators, providing a comprehensive overview of the Volterra site, its cultural heritage and landscape, both in near-real time and back-analysis and at different scales of investigation.

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Section: Discussionmentioning

confidence: 99%

Detecting Slope and Urban Potential Unstable Areas by Means of Multi-Platform Remote Sensing Techniques: The Volterra (Italy) Case Study

2016

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“…These seven point should be always considered in the case of historic buildings, regardless of the cause of existing damage. All these points could be found in well-done measurements made on historic buildings no matter whether it is a construction: timber-framed [8], masonry tower [9,10] or masonry building [10]. In this article detailed measurements and interpretation methodology of expertise of historic building subjected to dynamic influences is presented.…”

Section: Introductionmentioning

confidence: 92%

Protection of historic buildings against environmental pollution of vibrations

Kowalska-Koczwara

Stypuła

2016

E3S Web Conf.

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Abstract. Historic buildings in Poland are largely neglected objects that small percentage is preserved in its original form. Unrelenting in the case of historic buildings is a time that brings with it the natural processes of aging of buildings , but also the history of the object which is often marked by military conflicts, fires or even incompetently carried out reconstruction. Nowadays historic buildings are also destroyed by the rapid development of infrastructure and residential construction. This development could lead to changes of water in the soil, make changes in the geologic al structure or cause exposure of the historic building to the new influences (eg. traffic vibrations), to which building has not been subjected so far. Vibrations are often omitted in environmental issues, although the protection against noise and vibration has its place in the Law on Environmental Protection. This article presents the methodology for the measurement and interpretation of vibration influence on historic buildings and the assessment methods of technical condition of historic building on the example of dynamic measurements made on St. Nicholas Church in Krakow. The importance of well-done crack-by-crack documentation and characterization of damages based on damage index is shown. Difficulties that can be encountered when determining the causes of technical condition of historic buildings are also shown. Based on the example of the Church in the article are also given the possible protection solutions of historic structures from vibrations.

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“…O método de ultrassom, utilizado neste trabalho para avaliar a integridade de assoalhos de madeira, foi utilizado por Kandemir-Yucel et al (2007), juntamente com termografias de infravermelho, para avaliar as condições de vigas de madeira em prédios históricos. Os dois estudos mostram que o método é sensível a degradação interna da madeira e se mostram como boa opção para obras de restauro, corroborando dados entre si.…”

Section: Velocidade De Propagação Das Ondas Ultrassônicas Em Função Dunclassified

Estimativa da deterioração da madeira de assoalho de prédio histórico por meio de ondas ultrassônicas

Gatto

Gonçalves

Mattos

et al. 2012

CERNE

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RESUMO:Esse trabalho apresentou como objetivo detectar o grau externo de deterioração da madeira de Araucaria angustifolia (Bert.) O. Kuntze utilizada na confecção de assoalho. Para isso, foram testados os métodos visuais, por meio de notas, e o método não destrutivo baseado na propagação de ondas ultrassônicas. Comparando-se a velocidade de propagação de ondas ultrassônicas na madeira sadia e na madeira atacada verificou-se que as mesmas diferenciavam entre si ao nível de 5% de erro. Verificou-se também que o aumento na proporção de ataque na madeira apresentou-se inversamente proporcional à velocidade de propagação da onda. Uma vez que as amostras foram avaliadas apenas nas suas faces superficiais, fazem-se necessários estudos adicionais a fim de avaliar a influência dos defeitos internos das peças de madeira na velocidade ultrassônica.Palavras-chave: Qualidade da madeira, método não destrutivo, onda de ultrassom. EVALUATION OF WOOD DECAY OF FLOOR OF HISTORIC BUILDING USING ULTRASONIC WAVES INTRODUÇÃOA avaliação não destrutiva da madeira tem tido aplicação crescente na avaliação da qualidade da madeira e apresenta vantagens em relação aos métodos convencionais, tais como possibilidade de avaliar a integridade estrutural de uma peça sem a extração de corpos de prova; maior rapidez para analisar uma grande população e versatilidade para se adequar a uma rotina padronizada numa linha de produção (OLIVEIRA; SALES, 2002). Diversas tecnologias são empregadas visando a esse objetivo, dentre as quais Ross (1999) cita o raios-X, análise química, propriedades vibracionais e transmissão de ondas sonoras.A avaliação não destrutiva de madeiras com base nos princípios da propagação de ondas mecânicas, mais precisamente por meio da técnica de emissão de ultrassom, atualmente é um dos métodos mais aplicados e promissores, em razão da importância das informações que podem ser obtidas, da facilidade de operação do equipamento e do custo relativamente baixo na aquisição e operacionalização do mesmo.

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In situ assessment of structural timber elements of a historic building by infrared thermography and ultrasonic velocity

Cited by 73 publications

References 11 publications

Detecting Slope and Urban Potential Unstable Areas by Means of Multi-Platform Remote Sensing Techniques: The Volterra (Italy) Case Study

Detecting Slope and Urban Potential Unstable Areas by Means of Multi-Platform Remote Sensing Techniques: The Volterra (Italy) Case Study

Protection of historic buildings against environmental pollution of vibrations

Estimativa da deterioração da madeira de assoalho de prédio histórico por meio de ondas ultrassônicas

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