1,355,236 research outputs found
Comparative Seismic Assessment Methods for Masonry Building Aggregates: A Case Study
No full textRecent seismic events produced considerable socio-economic losses. An important step for the reduction and mitigation of seismic risk in urban areas with a high population density is the assessment of global vulnerability of clustered buildings. The proposed work aims at appraising the seismic vulnerability of building aggregates within the historical center of Arsita, damaged by the L'Aquila earthquake (2009 April 6th), through a multi-level approach deriving from the application of different estimation procedures. In particular, the seismic vulnerability quantification has been done by comparing three distinct methods, namely the macroseismic approach according to the EMS-98 scale, the Vulnus methodology, developed by the University of Padua, and the mechanical approach derived from using the 3Muri software. The expected damage has been estimated in terms of fragility curves, respectively, for the entire buildings compound and the individual structural units located in the corner and intermediate positions, in order to evaluate the beneficial or detrimental aggregate effect on the seismic behavior of individual constructions examined
Seismic Damage Scenarios Induced by Site Effects on Masonry Clustered Buildings: A Case Study in South Italy
No full textThe present research aims to explore the influence of site effects on the seismic vulnerability of the historical centre of Baranello, a little town in the Molise Region of Italy. Structural and typological classification of the investigated urban area has been done according to the EMS-98 scale. The vulnerability assessment of the inspected historical buildings has been carried out through an appropriate survey form to identify the buildings most susceptible to seismic damage. Consequently, using the Post-Earthquake Damage and Safety Assessment (AeDES) form implemented by the Italian Civil Protection Department (DPC), the typological vulnerability curves of the built-up area have been derived based on the damages recorded after the 2002 Molise earthquake. Finally, a local amplification factor, which increases the severity of the seismic damage to the structures, has been taken into account based on the time-domain method. Results reveal that the local amplification effects significantly increase the expected damage, which should lead to the collapse of almost all the investigated buildings for epicentre distance of 5.0 km and magnitude of 6.0. This means that the proposed simplified approach can represent a useful tool to more appropriately foresee the seismic risk of urban centres
Induced seismic-site effects on the vulnerability assessment of a historical centre in the molise Region of Italy: Analysis method and real behaviour calibration based on 2002 earthquake
No full textThe present research aims to estimate the influence of site amplification on the seismic vulnerability of the historical centre of the municipality of Baranello in the Molise Region of Italy. Firstly, a structural and typological characterization of the investigated area has been done according to the EMS-98 scale. Subsequently, the vulnerability assessment of the historical buildings located there has been carried out through an appropriate survey form in order to identify the buildings which are most susceptible to seismic damage. To this purpose, the seismic event occurring in October of 2002 has been selected as a reference earthquake. Moreover, according to the AeDES form implemented by the Italian Civil Protection Department to evaluate the usability of constructions after seismic events, the calibration of the typological vulnerability curves of the built-up area has been done, and a quantitative assessment of the local seismic response has been achieved, based on the seismic motions recorded after the 2002 Molise earthquake. Finally, the local amplification factor, which negatively influences the severity of the seismic damage on the structures, has been taken into account in order to more correctly foresee the expected damage of the inspected urban sector, so as to use more appropriately the achieved results for reliable seismic risk mitigation plans
Active Protection of High-Risk Small Side Branches in Bifurcation Interventions Is Preventing Occlusion Always Clinically Relevant?
No full textThe Influence of Geo-Hazard Effects on the Physical Vulnerability Assessment of the Built Heritage: An Application in a District of Naples
No full textThe proposed study aims at analysing a sub-urban sector in the historic centre of Qualiano, located in the province of Naples (Italy), in order to assess the seismic vulnerability of the main typology classes (masonry and reinforced concrete) in the study area and the consequent expected damage scenarios. The typological and structural characterisation of the investigated area is done through the CARTIS form developed by the PLINIVS research centre together with the Italian Civil Protection Department. Subsequently, the vulnerability simulation analysis is carried out by means of a quick methodology integrated into a GIS tool in order to identify the structural units (S.U.) most susceptible at damage under seismic events. Furthermore, in order to take into account the possible damage scenarios, a parametric analysis is performed using a seismic attenuation law in order to obtain the maximization of the expected urban losses. Finally, the site and topographical local conditions, which negatively influence the severity of the seismic damage on the structures, have been taken into account in order to more correctly foresee the expected damage of the inspected sub-urban sector to be used for appropriate seismic risk mitigation plans
Geo-Hazard-Based Approach for the Estimation of Seismic Vulnerability and Damage Scenarios of the Old City of Senerchia (Avellino, Italy)
No full textThe large-scale seismic risk assessment is a crucial point for safeguarding people and planning adequate mitigation plans in urban areas. The current research work aims at analysing a sector of the historic centre of Senerchia, located in the province of Avellino, in order to assess the seismic vulnerability and damage of old masonry building compounds. First, the typological classification of the inspected building aggregates is developed using the CARTIS form developed by the PLINIVS research centre in collaboration with the Italian Civil Protection Department. The global seismic vulnerability assessment of the building sample is carried out using the macroseismic method according to the EMS-98 scale in order to identify the buildings most susceptible to seismic damage. Furthermore, 12 damage scenarios are developed by means of an appropriate seismic attenuation law. Finally, the expected damage scenarios considering the local hazard effects induced are developed in order to evaluate the damage increment, averagely equal to 50%, due to the seismic amplification of different soil categories
Neuropsychological Evaluation of Single Suture Craniosynostosis (SSC)
No full textSingle suture craniosynostosis (SSC) are characterized by the premature fusion of one or more sutures separating the bony plates of the skull during the early development. They can occur as isolated disorder or be part of a syndrome. Isolated craniosynostosis usually involves one suture (mono-sutural synostosis) and shows a significantly better esthetic, surgical, and developmental outcome if compared with multi-sutural/syndromic synostosis. However, also, children affected by mono-sutural synostosis can show an adverse neurodevelopmental outcome, especially concerning visual, cognitive, language, and motor domains
Probabilistic earthquake scenarios of a historical area in the town of Amatrice
No full textThis research aims at studying the effects induced by the seismic sequence occurred in 2016 in the Central Italy. The mainshock recorded, which had a moment magnitude of 6.0, caused substantial damages to several historical centres of different Italian regions. In the paper, the attention is focused on the damage scenario of an urban sector within the old town of Amatnce. Firstly, the Risk-UE method has been applied to characterize the physical vulnerability of the construction types detected there. Finally, a probabilistic scenario analysis has been performed to estimate the damages of the examined sector deriving from the occurred earthquake, which has been compared to that deriving from the design spectrum at the Life Safety limit state contemplated in the current Technical Italian code (NTC 2018)
Empirical and mechanical analysis methods for seismic vulnerability assessment of clustered buildings of historical centres: A case study
No full textPresently, in historical centres, it is very difficult to analyse buildings as independent structures, since they share the same boundary walls with adjacent structural units. These constructions of the building aggregate interact among themselves under seismic actions, so that their behaviour differs from that of the individual buildings considered as isolated structures. Therefore, it is emerging the need to assess seismic vulnerability of building aggregates. Thus, in this paper both simple empirical and mechanical refined vulnerability evaluation methods of masonry building aggregates are examined in general terms and illustrated in detail through the application on a case study in Mirandola, a district of Modena. On one hand, two empirical assessment methodologies, mainly based on the basic observational data of masonry constructions and properly calibrated on macro-element analysis results on a significant number of clustered buildings, are proposed taking properly into account the interactions among adjacent constructions. On the other hand, a mechanical analysis method at the individual building scale is also applied to evaluate more realistically the seismic behaviour of clustered structural units through the development of appropriate capacity curves
Exposure and seismic vulnerability of masonry buildings grouped in aggregate of a typical historical centre in the Basilicata region of Italy
No full textThe proposed study focuses on the typological and structural characterization of masonry building aggregates located in the historical centre of Atella, a small town in the district of Potenza in the Basilicata region of Italy. The data regarding building exposure were collected using the CARTIS form in the framework of Working Package 2 “Inventory of existing structural typologies” of the Italian DPC-ReLUIS project, which relates to the predominant structural taxonomies identified on-site. Subsequently, the surveyed structural information was used to carry out a preliminary vulnerability and damage analysis for the investigated urban area. Finally, the main outcomes of the study were provided in terms of the Building Typology Matrix (BTM) vulnerability functions, emphasising the differences in terms of expected susceptibility to damage of the identified CARTIS typologies
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