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Journal ArticleDOI: 10.1080/15583058.2019.1624874

Traditional T-F Masonries in the City Centre of L’Aquila – The Baraccato Aquilano

04 Mar 2021-International Journal of Architectural Heritage (Informa UK Limited)-Vol. 15, Iss: 3, pp 437-454
Abstract: Several baraccate houses, which date back to the eighteenth century, were discovered in the historical center of L’Aquila, Italy. Among traditional earthquake-resistant timber frames (T-F) in the M...

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Journal ArticleDOI: 10.1016/J.ENGSTRUCT.2020.110593
Abstract: So far, few in situtests have been carried out to estimate the modal parameters of multi-storey Cross-Laminated-Timber (CLT) buildings: the understanding of their dynamic behaviour under operational conditions is still an open issue. In this paper, the results of the dynamic identification of an eight-storey CLT building are reported and interpreted in the light of a simplified shear-type analytical model. The structural model is calibrated on the experimental modal parameters, which are assessed using the Stochastic Subspace Identification (SSI). The SSI provides mode shapes, natural frequencies and damping factors of the structures in its first linear response range; The minimum of a modal-based objective function gives an estimation of the unknown parameters of the structural model. Given the results of the dynamic identification, the storey-masses are the chosen optimization parameters: the values of the experimental eigenfrequencies likely reveal a continuum-like behaviour of the building without connections. The identified storey masses are indeed realistic and confirm the negligible role of the connections in the low-amplitude dynamic response. The nonlinear effects of connections over the building response to higher displacements are discussed, providing simplified and practice-oriented correlations for the first natural frequency estimation.

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33 Citations


Journal ArticleDOI: 10.1080/15732479.2020.1731559
Angelo Aloisio1, Luca Di Battista1, Rocco Alaggio1, Elena Antonacci1  +1 moreInstitutions (1)
Abstract: The article focuses on the assessment of a structural intervention using a simple Bayesian approach driven by subspace-based indicators. A permanent monitoring system installed in a monumental maso...

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25 Citations


Journal ArticleDOI: 10.1061/(ASCE)AE.1943-5568.0000426
Abstract: In this paper, the history of the basilica of Santa Maria di Collemaggio for the last 10 years is outlined: from the damage occurred during the 2009 earthquake in L’Aquila, to the rehabili...

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18 Citations


Journal ArticleDOI: 10.1016/J.ENGSTRUCT.2020.110619
Abstract: Dynamic measurements under known moving loads yield a novel procedure for the elastic modulus assessment of existing concrete bridges. The bridge deck is modelled as a single-span, simply supported Euler–Bernoulli beam excited by a travelling force. The elastic modulus assessment derives from an Ordinary Least Square procedure with a Bayesian uncertainty estimation, obtained by approximating the known term of the governing equations due to the travelling force with a square wave signal. The authors validated the procedure on six full-scale concrete girders of the A24 motorway in Italy and compared the results to the values obtained via in situ static load tests and further tests on concrete specimens. The procedure represents a straightforward test devised for supporting the drafting of quality control plans and the prioritization of the interventions.

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Topics: Elastic modulus (54%), Beam (structure) (51%), Girder (50%)

18 Citations


Journal ArticleDOI: 10.1177/8755293020936696
01 Feb 2021-Earthquake Spectra
Abstract: The authors assessed the fragility functions and behavior factors of cross-laminated timber (CLT) structures. The structures derive from the assembly of single CLT wall panels characterized by diff...

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Topics: Cross laminated timber (62%), Fragility (57%)

16 Citations


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42 results found


Journal ArticleDOI: 10.1007/S10518-010-9224-4
Dina D'Ayala1, Sara Paganoni1Institutions (1)
Abstract: The paper describes the output of a survey carried out in the district of L’Aquila, Italy, in May 2009 after the April earthquake and later in January 2010, and the consequent vulnerability assessment completed by the authors. Observations collected on site regard masonry buildings of the historic centre of L’Aquila and the towns of Paganica and Onna; particular focus was given to a number of buildings of interest, which better represent two locally recurrent building typologies: the mansion and the common dwelling. A description of the main structural features and their influence on damage mechanism is provided, stressing the importance of elements such as wall lay-out, quality of masonry and strengthening interventions. The gathered information is used as input for the application of the FaMIVE method (D’Ayala and Speranza in Earthq Spectra 19(3):479–509, 2003), whereby feasible collapse mechanisms and the associate failure load factors can be identified. The procedure is briefly outlined and results are discussed from the point of view of the performance point: push-over curves produced by statistical elaboration of FaMIVE’s output are compared both with the demand spectra obtained from EC8 and the response spectrum for the main shock as recorded by the closest station to the town. Conclusions are drawn on the reliability of the FaMIVE method with respect to its capability of predicting the damage mechanism identified on site.

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233 Citations


Journal ArticleDOI: 10.1016/J.ENGFAILANAL.2013.01.021
Abstract: The seismic behaviour of masonry churches damaged during the 2009 L’Aquila earthquake is studied in this paper. Four important basilicas are considered in order to derive general conclusions from the damage assessment and the performance analysis. As a general result of the comparison between the post-earthquake survey activity and the structural analyses the possibility of evaluating the seismic safety of churches, and therefore of avoiding destructive damage by means of the design and application of appropriate retrofit interventions, is confirmed. Comparative numerical analyses on a sample of four churches have highlighted another important aspect: the dynamic excitation due to the seismic ground motion activates many vibration modes of the building structure, though all of them are characterised by small participation factors. This fact leads to the following important consequences: the high spectral values of the registered record of the L’Aquila earthquake do not correspond to equivalent high values of base shear; in particular the results showed that in all the examined case studies, the base shear V ratio ranged between 20% and 30% of the church weight. Therefore the appropriate choice of the force reduction factor to be adopted for these monumental buildings is not so large since the real shear force value was significantly smaller than the plateau value of the spectral acceleration provided by Italian Code. Furthermore, the awareness of the activation of many local modes under seismic excitation calls for retrofit interventions which have to “tie up” the building, thus avoiding local failures that are often observed. The final conclusion is that the observation of damage and failures under real experimental actions, like real earthquakes, are a precious means for the advancement of knowledge in the field of seismic engineering.

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Topics: Seismic risk (62%), Earthquake simulation (60%), Seismic retrofit (60%) ... read more

156 Citations


Journal ArticleDOI: 10.1007/S10518-010-9205-7
Franco Braga1, Vincenzo Manfredi, Angelo Masi, A. Salvatori  +1 moreInstitutions (1)
Abstract: In Italy infills and partitions (non-structural elements) are typically made up of hollow brick masonry, disposed in one or two parallel vertical walls. Many studies have analysed their role on the seismic behaviour of moment resisting framed RC buildings and many seismic codes, all over the world, have provided specific additional measures for them. During the Abruzzo seismic sequence, non-structural damage in RC buildings, both private and public, was extensive, varying from small cracks to collapse, along with minor or no damage to structural elements. This damage involved a number of buildings, both old and recently completed, determining heavy socio-economic consequences, including human casualties, loss of building functionality (particularly important in case of strategic constructions), and unusable buildings. In this paper a review of the most frequent damage patterns is performed, aimed at identifying the main causes of damage and linking them to commonly adopted construction rules. For this purpose, local and global structural configurations frequently exhibiting non-structural damage are described, aside from out-of-plane and in-plane failures. Furthermore, a review of code provisions on non structural elements has been performed in the paper making reference to the most prominent current seismic codes and, finally, some design and construction rules are suggested.

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144 Citations


Journal ArticleDOI: 10.1007/S10518-011-9307-X
Sergio Lagomarsino1Institutions (1)
Abstract: L’Aquila earthquake, which occurred on April 6, 2009, proved the high vulnerability of cultural heritage, with particular reference to churches. Damage assessment in the emergency was carried out on more than 700 churches with a methodology aimed at recognizing the collapse mechanisms in the different architectonic elements of the church. The method was developed after the earthquake in Umbria and the Marches (1997) and has been widely used in the last decade; this approach is also very useful for seismic prevention, as it allows one to single out the most vulnerable structures. Some examples are presented in this paper, representative of recurrent damage in the main elements of the church: the facade, the roof, the apse and the belfry. It emerges that, for a correct interpretation of damage and vulnerability, it is necessary a deep knowledge of local construction techniques and of the historic transformation sequence. Moreover, the bad behaviour of churches strengthened by modern techniques, such as the substitution of original timber roofs with stiff and heavy r.c. slabs, was observed. Starting from the observation of some case studies, the paper achieves some worth results, which may be useful for correctly driving future strengthening interventions.

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135 Citations


Journal ArticleDOI: 10.1061/(ASCE)CF.1943-5509.0000122
Nicola Augenti1, Fulvio Parisi1Institutions (1)
Abstract: An earthquake sequence struck the province of L’Aquila (central Italy) leaving 305 dead, about 1,500 injured, and 29,000 homeless. Hundreds of low-intensity events occurred between January and March, 2009. The mainshock took place on April 6, 2009, and its epicenter was located at about 6 km southwest of L’Aquila town; three stronger aftershocks happened on April 7 and 9, 2009. This paper focuses on actual performance of older and more recently constructed building structures during the earthquake sequence. After the main seismological characteristics of the sequence are described, the most significant observed damages are analyzed and associated with theoretical failure modes for both reinforced concrete and unreinforced masonry buildings. Since older masonry structures were more seriously damaged, the effects of the earthquake are described with more emphasis to ordinary masonry and cultural heritage buildings (churches, palaces, and castles). In conclusion, a number of lessons may be learned from the L...

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Topics: Unreinforced masonry building (58%), Aftershock (53%), Masonry (52%)

117 Citations


Performance
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No. of citations received by the Paper in previous years
YearCitations
202112
20208
20181