Sustainable Interventions: Conservation of Old Timber Roof of Michelangelo’s Cloister in Diocletian’s Baths

Santini, Silvia; Baggio, Carlo; Sguerri, Lorena

doi:10.1080/15583058.2021.1938747

Cited by 8 publications

(6 citation statements)

References 17 publications

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“…With regard to chestnut, some studies have been conducted on old structural elements with different results. Faggiano et al [12] found a strong correlation between Edyn and the bending modulus (Eb) with R 2 = 0,76 as well as Santini et al [5] although in this case, the correlation involved the compression modulus (EC,0). On the other hand, Koca et al [16] found a weak correlation between Edyn and Eb with R 2 = 0,32.…”

Section: Ultrasonic Pulse Velocitymentioning

confidence: 77%

“…Some experimental works aimed to find the correlation laws between the drilling resistance and the physical and mechanical properties of wood were made about chestnut too. With regard to density, processing the data obtained by Faggiano et al [12] who tested 24 ancient chestnut beams by means of a Resistograph IML RESI F400, a correlation with R 2 = 0,43 was obtained, while the authors themselves, with the same device, found a correlation with R 2 = 0,32, performing the test along 9 purlins of the late nineteenth century [5].…”

Section: Resistographmentioning

confidence: 95%

“…On the other hand, the Resistograph involves all section thickness, but any correlation laws with density are strictly connected with the model of the instrument and with the drilling speed. In order to overcome these limits, it is proposed to combine the two methods as already suggested by the authors [5], although in place of the Woodpecker, the Pylodin was used.…”

Section: Combined Methodsmentioning

confidence: 99%

“…This research is the prosecution of two previous works carried out on the first part of the sample that originally counted 40 purlins. The first work addresses the issue of sustainability for interventions on ancient wooden structures, proposing a methodology of analysis of NDT, aimed at limiting the decommissioning and replacement of roofing, suggesting non-invasive methods of analysis to understand the bearing capacity of the primary elements [5]. The second work focuses on the assessment of the sustainability of the interventions carried out over the decades on the Cloister of Michelangelo.…”

Section: Previous Workmentioning

confidence: 99%

See 3 more Smart Citations

Sustainable Assessment: A Contribution to Improve the Reliability of NDT on Old Chestnut Purlins

Borghese

Santini

Sguerri

2023

World Conference on Timber Engineering (WCTE 2023)

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The aim of this study is to give an additional contribution to the improvement of a sustainable diagnostic practice to be used for the assessment of ancient wooden structures, in order to limit the damage of the existing ones through destructive tests, and to have a reliable prediction of old element properties, with their historical value, reducing demolition and substitution with consumption of new materials. To achieve this purpose, correlation laws and methodologies that can be used to facilitate the performance of non-destructive testing (NDT) in situ, will be highlighted. Seventeen chestnut purlins, dated between the 19th century and the 20th century and coming from the roof of the Cloister of Michelangelo at the Baths of Diocletian in Rome, are tested. As the first part of a wider experimentation, the aim is to identify the best practice for three relevant unknowns that characterize a wooden structural element: the geometry, through the survey and the BIM modelling; the density by means of the penetrometric tests (Resistograph and Woodpecker); the elastic module through direct and indirect ultra-sonic tests.

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Section: Ultrasonic Pulse Velocitymentioning

confidence: 77%

Section: Resistographmentioning

confidence: 95%

Section: Combined Methodsmentioning

confidence: 99%

Section: Previous Workmentioning

confidence: 99%

See 2 more Smart Citations

Sustainable Assessment: A Contribution to Improve the Reliability of NDT on Old Chestnut Purlins

Borghese

Santini

Sguerri

2023

World Conference on Timber Engineering (WCTE 2023)

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“…The majority of them have been partially or completely replaced because of the prevailing hypothesis of insufficient mechanical properties rather than performing an accurate assessment of the health state in force of the criteria for authenticity, as well as the concepts of minimal intervention and reversibility. This would require precise diagnostic procedures, including an examination of historical timber performance in situ using visual inspections (eventually assisted by drones) and non-destructive tests (NDT), such as hygrometric tests, ultrasonic investigations, penetrometric tests, and drilling resistance [7,8]. Concerning the overall architectural heritage, the only information available indi cates that over 900,000 of the 3.16 million historic structures that must be preserved re quire structural repair, with around one-third of Italian buildings having been constructed before 1945 [6].…”

Section: Introductionmentioning

confidence: 99%

HBIM-Based Decision-Making Approach for Sustainable Diagnosis and Conservation of Historical Timber Structures

2023

Self Cite

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Historical timber roofs play a significant role in architectural heritage, as listed in the World Heritage List protected by UNESCO. Despite their complexity, they are frequently lacking in maintenance, with the consequence that only a few original examples have been preserved until today, contradicting the principle of minimum intervention. In the paper, a decision-making approach has been proposed for the best and most sustainable solution, in which tradition and innovation meet to achieve the maximum quality with minimum intervention. With an emphasis on sustainability (environmental, economic, technological, historic, and social), analyses have been carried out in order to compare various intervention alternatives, modeled in a Heritage-Building Information Modeling (HBIM) environment, assessed using the Analytical Hierarchy Process (AHP), and implemented with the multi-criteria Modelo Integrado de cuantificacion de Valor para Edificacion Sostenibles (MIVES) methodology. The case study is the roof of the Michelangelo Cloister in the Diocletian Baths in Rome, which is a significant example of historical timber roofs. The results are given in terms of a quantitative sustainability index SI, which takes into account different alternatives of intervention, including the task of diagnosis.

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Correlation between thermal and density properties of chestnuts: preliminary results of experimental non-destructive testing

Borghese,

Santoro,

Santini

et al. 2024

Arch. Civ. Mech. Eng.

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This study presents the preliminary outcomes of a methodology for the physical and mechanical characterization of various chestnut elements in different states of preservation. Strategizing conservation and retrofit interventions for timber is necessary, and to do this, it is necessary to establish an estimation of physical (transmissivity, thermal conductivity, humidity level, etc.) and mechanical properties (density, compressive or bending strength, etc.). This essential information is typically associated with timber defects, but there are lack of correlations. The primary objective is to establish correlations between thermal and density properties with the aim of preserving original assets. The investigation delves into the relationship between timber density and thermal properties through experimental non-destructive testing (NDT). Two NDTs were employed with the aim of correlating: penetrometric testing and active thermography investigations. The parametric study on the excitation period yielded valuable insights into the temporal dynamics of heat transfer within the timber, underscoring the significance of selecting appropriate excitation periods to capture precise thermal properties. Tabular data on relative humidity for salified, dried, and new samples provided a quantitative backdrop to these observations, unveiling the nuanced effects of humidity on the timber’s thermal response. The results of this study are positioned to inform future conservation efforts by laying the groundwork for a comprehensive understanding of timber’s mechanical properties. Particularly, the challenge lies in accurately estimating density, where surface tests are often less reliable than in-depth ones. Therefore, it is crucial to seek validation through other NDT tests, such as thermographic analysis and visual inspection, and hygrometric tests recognizing their importance in enhancing the reliability of density assessments. This approach will contribute to the development of more discerning preservation strategies.

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Sustainable Interventions: Conservation of Old Timber Roof of Michelangelo’s Cloister in Diocletian’s Baths

Cited by 8 publications

References 17 publications

Sustainable Assessment: A Contribution to Improve the Reliability of NDT on Old Chestnut Purlins

Sustainable Assessment: A Contribution to Improve the Reliability of NDT on Old Chestnut Purlins

HBIM-Based Decision-Making Approach for Sustainable Diagnosis and Conservation of Historical Timber Structures

Correlation between thermal and density properties of chestnuts: preliminary results of experimental non-destructive testing

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