Assessment of a monumental masonry bell-tower after 2016 Central Italy seismic sequence by long-term SHM

Ubertini, Filippo; Cavalagli, Nicola; Kita, Alban; Comanducci, Gabriele

doi:10.1007/s10518-017-0222-7

Cited by 137 publications

(98 citation statements)

References 69 publications

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“…Therefore, this study has encouraged many researchers who, starting from the observation of existing structures, have carried out numerical and experimental studies able to reflect the building real behavior subjected to static and dynamic loads. Regarding the experimental investigations, ambient vibration tests are the main methods for assessing the seismic behavior of full-scale structures Clementi et al, 2017Clementi et al, , 2018Ubertini et al, 2017Ubertini et al, , 2018. Obtained results have been used as the basis for implementing different non-linear analysis methods Brando et al, 2017;Quagliarini et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Seismic and Energetic Interventions on a Typical South Italy Residential Building: Cost Analysis and Tax Detraction

Formisano

Vaiano

Fabbrocino

2019

Front. Built Environ.

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Italian buildings are mainly represented by unreinforced masonry (URM) constructions, which were mostly built before 1970, often without respecting seismic design criteria. The main objective of Italian designers is, therefore, to retrofit these buildings in order to improve their safety under earthquake, as well as to preserve the memory of the ancient building art. In addition, the assessment of the building energetic efficiency is nowadays a very pressing need for designers and practitioners. Energetic efficiency represents the capacity to optimize the consumption of energy resources in order to reach prefixed requirements for the environment protection . This paper shows both seismic and energetic retrofitting interventions on a residential URM building typical of the constructive practice in the South Italy. Initially, the building characterization under geometrical and structural viewpoints is done. Subsequently, the seismic vulnerability verification is performed with unsatisfactory results, so requiring upgrading or retrofitting interventions. Moreover, with the aim to increase living comfort and energy efficiency, energetic upgrading interventions, aimed at decreasing the building transmittance, are proposed. Seismic and energetic interventions are then computed from the economic point of view in order to evaluate the financial contributions foreseen by the Italian 2018 Balance Law through the Sismabonus and Ecobonus tools, respectively. Finally, the study proposes a global performance index able to take into account contemporary the seismic, energetic, and economic benefits deriving from retrofitting interventions applied on the inspected residential building.

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Section: Introductionmentioning

confidence: 99%

Seismic and Energetic Interventions on a Typical South Italy Residential Building: Cost Analysis and Tax Detraction

Formisano

Vaiano

Fabbrocino

2019

Front. Built Environ.

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“…The evaluation of seismic damage, when supported by diagnostic tests, is a necessary tool to acquire the characteristics of a building, to identify its weaknesses, and to understand what are the best solutions to be implemented [16][17][18] . The knowledge of a building is essential to define the necessary action and intervention to improve the seismic capacity of the building [19][20][21] .…”

Section: Introduction and Methodologymentioning

confidence: 99%

Damage assessment of Nepal heritage through ambient vibration analysis and visual inspection

Russo

Spoldi

2020

Struct Control Health Monit

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Summary The aim of this paper is to identify, both through microtremor analysis and visual inspection, the collapse mechanisms of the Nepalese wood‐masonry monuments damaged by the 2015 seismic event that struck Kathmandu and its valley. The research analyses two case studies as the “Radha Krishna” temple located in Teku, a district in Kathmandu, and the “Pancha Deval complex” in Pashupati area. More specifically, after a careful anamnesis based on visual inspection and hypotheses on the temple's structural behaviour, global nondestructive testing (microtremor) was carried out for qualitative characterization of the structural system. The visual damage survey allowed to identify the recurring collapse mechanisms in the two case studies with the identification of typical Nepali expected damage. The case of Radha Krishna temple denotes a Nepali collapse mechanism typical in the corner of temples made of timber masonry, in which the mechanical contribution of the timber is manifested through columns and windows. The ambient vibration analysis carried out by tromograph device and microtremor evaluation allowed to dynamically characterize the two bases by identifying the peak frequencies both for Radha Krishna and for Pancha Deval complex. With the same device, the two historic constructions have been also studied in evaluating local modes and frequency. In the Pancha Deval complex, a relationship between damage, frequencies, and the amplification of the base was observed. In detail, the five buildings have similar damage and similar first frequencies (2.72–2.9 Hz). The most damaged sides are those with the frequencies close to the base (2.05–2.38 Hz).

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“…In addition, the indoor and outdoor environmental conditions (temperature and humidity) are extensively monitored with the two-fold objective of evaluating the risks for the conservation of the main artifacts present in the Cathedral [11] and establishing correlations with the structural parameters changes. The importance of the latter aspect for historic masonry structures has been shown in the long-term monitoring of towers [12][13], churches [14][15], cathedrals [16] and monumental buildings [17]: all those studies have highlighted that resonant frequencies [11][12][13][14][15][16][17], as well as static structural parameters [14][15]17], are significantly affected by changes in the environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Continuous monitoring of the Milan Cathedral: dynamic characteristics and vibration-based SHM

Gentile

Ruccolo

Canali³

2019

J Civil Struct Health Monit

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The traditional collaboration between Politecnico di Milano and Veneranda Fabbrica del Duomo di Milano  the historic Institution established by Gian Galeazzo Visconti in 1387 and having in charge all operational aspects related to the Milan Cathedral since more than 600 years  recently focused on the design and installation of a structural monitoring system, with the objective of assisting the condition-based structural maintenance of the historic church through the continuous interrogation of sensors installed in the structure and the extraction from measured data of features which are representative of the current state of structural health. The new monitoring system of the Milan Cathedral includes different types of measurements and sensors: quasi-static acquisition of strain in selected tie-rods and biaxial tilt of selected piers and the main spire, monitoring of inner and outer environmental parameters and dynamic measurement of the velocity response at the top of 14 piers and at 3 levels of the main spire. After a concise description of the historic church and of the monitoring system, the paper focuses on the dynamic characteristics of the Milan Cathedral, their evolution during the first months of monitoring (since October 16th, 2018) and the lessons learned in view of the Structural Health Monitoring of the monument. The presented results from the vibration monitoring highlight that: (a) 8 global modes of vibration are automatically detected in the frequency range 1.0-5.0 Hz; (b) the resonant frequencies exhibit a distinctive trend of variation, which is mainly driven by temperature; (c) the mode shapes of the Cathedral do not show appreciable fluctuations associated to the environmental effects.

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Assessment of a monumental masonry bell-tower after 2016 Central Italy seismic sequence by long-term SHM

Cited by 137 publications

References 69 publications

Seismic and Energetic Interventions on a Typical South Italy Residential Building: Cost Analysis and Tax Detraction

Seismic and Energetic Interventions on a Typical South Italy Residential Building: Cost Analysis and Tax Detraction

Damage assessment of Nepal heritage through ambient vibration analysis and visual inspection

Continuous monitoring of the Milan Cathedral: dynamic characteristics and vibration-based SHM

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