Non-destructive characterization of ancient clay brick walls by indirect ultrasonic measurements

Mesquita, Esequiel; Martini, Rachel Jardim; Alves, Ana; Antunes, Paulo; Varum, Humberto

doi:10.1016/j.jobe.2018.05.011

Cited by 39 publications

(13 citation statements)

References 18 publications

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“…In order to strengthen existing weak structures, assessment must be necessarily designed and carried out. In the past, most of the initial work on seismic assessment was based only on the visual inspection of buildings [27], NDT methods (see, for example, [32,41,[44][45][46]), as well as the experience of engineers. The last decade, however, has seen a growth in the technological development of various tools which can greatly support the prediction of structural safety and seismic behaviour of existing structures, i.e., thermography [36], photogrammetry [47], unmanned aerial vehicles [48], etc.…”

Section: Seismic Actions and Masonry Structuresmentioning

confidence: 99%

Methods for the Assessment of Critical Properties in Existing Masonry Structures under Seismic Loads—The ARES Project

et al. 2020

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Masonry structures are notoriously vulnerable to horizontal actions caused by earthquakes. Given the high seismicity of the European region, and that the European building stock comprises a lot of masonry buildings, knowledge about their structural response to seismic excitation is particularly important, but at the same time difficult to determine, due to the heterogenous nature of materials and/or constructional techniques in use. An additional issue is represented by the current methods for mechanical properties assessment, that do not provide a reliable framework for accurate structural estimations of existing buildings characterized by different typological properties. Every structure, in other words, should be separately inspected in regard to its mechanical behaviour, based on dedicated approaches able to capture potential critical issues. In this review paper, an insight on the Croatian ARES project is presented (Assessment and Rehabilitation of Existing Structures), including a state-of-the-art of the actual building stock and giving evidence of major difficulties concerning the assessment of existing structures. The most commonly used techniques and tools are compared, with a focus on their basic features and field of application. A brief overview of prevailing structural behaviours and Finite Element numerical modelling issues are also mentioned. As shown, the general tendency is to ensure “sustainable” and energy-efficient building systems. The latter, however, seem in disagreement with basic principles of structural maintenance and renovation. The aim of the ongoing ARES project, in this context, is to improve the current knowledge regarding the assessment and strengthening of structures, with a focus on a more reliable design and maintenance process for existing masonry buildings.

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Section: Seismic Actions and Masonry Structuresmentioning

confidence: 99%

Methods for the Assessment of Critical Properties in Existing Masonry Structures under Seismic Loads—The ARES Project

et al. 2020

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“…Dessa forma para a aplicação do método direto, foram realizadas 8 medições posicionando-se os transdutores em cada um dos quadrantes e variando sua posição em 5 cm. No entanto, para a implementação do método indireto, seguiu-se as determinações de (MESQUITA et al, 2018), em que inicialmente o transdutor transmissor foi espaçado em 10 cm do transdutor receptor, e posteriormente variou-se a posição do segundo em 5 cm até a obtenção de 6 medições.…”

Section: Metodologiaunclassified

“…Os ensaios ultrassônicos têm se difundido, portanto, como alternativa na compreensão dessas propriedades, como em (MESQUITA et al, 2018), onde foram analisadas as características dos painéis de alvenaria da Igreja Nossa Senhora do Rosário dos Pretos, por meio do método indireto do ensaio ultrassônico, permitindo identificar a presença de vazios na composição da alvenaria e revestimento, bem como identificar a presença de fissuras. O ensaio ultrassônico, portanto, consiste na utilização de dois transdutores, materiais piezoelétricos, que convertem o pulso elétrico emitido, em uma onda mecânica de frequência superior a 20 KHz, propagada pelo transdutor transmissor e recebida pelo transdutor receptor, que permite a conversão da onda mecânica recebida novamente em um pulso elétrico, que pode ser traduzida para o visor na forma de tempo e velocidade de propagação da onda.…”

Section: Introductionunclassified

Comparação Entre O Método Direto E Indireto Na Propagação De Pulso Ultrassônico Em Painéis De Alvenaria

Sousa¹,

Araujo²,

Rodrigues³

et al. 2020

≫Congresso Brasileiro De Patologia Das Construções

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A utilização de ensaios não destrutivos na caracterização de materiais ou de construções tem ganhado espaço em função da necessidade de estudos acerca do patrimônio histórico. Dessa forma, o ensaio ultrassônico surge como alternativa eficaz na análise do seu desempenho. No entanto, os diferentes métodos de análise, direto, indireto e semidireto apresentam resultados diferentes na obtenção das velocidades de pulso ultrassônico (VPU). Em função disso, foram realizadas comparações entre alguns desses métodos, buscando traçar comportamento semelhante entre os resultados obtidos por eles. Para isso, foram realizadas medições pelos métodos direto e indireto, em um painel de alvenaria de 150 x 100 x 13.5cm, por meio do equipamento Proceq ® PUNDIT 2000 ® 54 KHz. Ao comparar os resultados em ambos os métodos, foi possível estabelecer uma correlação de semelhança entre eles, permitindo compreender acerca das suas aplicações e interpretação de seus dados. Palavras-chave: velocidade de pulso ultrassônico, método indireto, painéis de alvenaria.

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“…Altunişik et al performed experimental measurements by ambient vibration test on an ancient masonry Bastion and extracted three first natural frequencies of the Bastion [3]. Many studies were done on the structural behavior assessment of historic monumental construction by finite element modeling and analysis [4,6,7,9,14,15,[17][18][19]22,24,25,28,29,31,35,38]. Micic et al (2015) studied the probabilistic analysis of the strength of masonry building walls over time.…”

Section: Introductionmentioning

confidence: 99%

Reliability-Based Safety Evaluation of the BISTOON Historic Masonry Arch Bridge

Pouraminian

Pourbakhshian

Farsangi

et al. 2020

Civil and Environmental Engineering Reports

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This research examines the probabilistic safety assessment of the historic BISTOON arch bridge. Probabilistic analysis based on the Load-Resistance model was performed. The evaluation of implicit functions of load and resistance was performed by the finite element method, and the Monte-Carlo approach was used for experiment simulation. The sampling method used was Latin Hypercube. Four random variables were considered including modulus of elasticity of brick and infilled materials and the specific mass of brick and infilled materials. The normal distribution was used to express the statistical properties of the random variables. The coefficient of variation was defined as 10%. Linear behavior was assumed for the bridge materials. Three output parameters of maximum bridge displacement, maximum tensile stress, and minimum compressive stress were assigned as structural limit states. A sensitivity analysis for probabilistic analysis was performed using the Spearman ranking method. The results showed that the sensitivity of output parameters to infilled density changes is high. The results also indicated that the system probability of failure is equal to p fsystem =1.55 × 10−3. The bridge safety index value obtained is βt = 2.96, which is lower than the recommended target safety index. The required safety parameters for the bridge have not been met and the bridge is at the risk of failure.

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Non-destructive characterization of ancient clay brick walls by indirect ultrasonic measurements

Cited by 39 publications

References 18 publications

Methods for the Assessment of Critical Properties in Existing Masonry Structures under Seismic Loads—The ARES Project

Methods for the Assessment of Critical Properties in Existing Masonry Structures under Seismic Loads—The ARES Project

Comparação Entre O Método Direto E Indireto Na Propagação De Pulso Ultrassônico Em Painéis De Alvenaria

Reliability-Based Safety Evaluation of the BISTOON Historic Masonry Arch Bridge

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