Seismic and energy retrofitting of residential buildings: a simulation-based approach

The topic of the high seismic vulnerability of housing stock in Italy is back again at the center of political, economic, social and scientific-technical debate following the seismic crisis that struck Marche, Umbria and Lazio regions in 2016. These events have once again raised the need for a massive retrofitting program at National and Regional level, addressing the majority of the existing building stock, realized for 60% prior to the adoption of the first seismic code (Law 64/74), in a territory characterized north to south by high levels of seismic hazard. In recent years, different kinds of tools have been implemented to allow the simulation of natural hazards’ impacts on the built environment and to support strategic choices both in the field of emergency management and resilience-based urban design and planning. Nevertheless, an integrated set of instruments for a quantitatively informed decision support is still missing. Within EU-FP7 CRISMA project, an integrated DSS (Decision Support System) application has been developed, with a set of tools and functionalities addressing the main aspects involved in the decision-making processes for natural hazards preparedness and response

Building Resilient Cities: A Simulation-Based Scenario Assessment Methodology for the Integration of DRR and CCA in a Multi-Scale Design Perspective

Resilience of the built environment and communities to natural and man-made hazards is consolidating worldwide as a key requirement in the field of urban planning and building design, and there is an increasing awareness that Sustainable Development Goals and priorities of the Sendai Framework cannot be achieved without a comprehensive approach able to promote the effective implementation of DRR and CCA measures within regeneration processes at various scales. In this sense, an “all-hazards” approach, addressing multiple risk conditions (including Natech and cascading effects) and integrating DRR and CCA design strategies, show a highly cost-effective potential, maximizing the effect of complementary measures and optimizing mitigation/adaptation design techniques within a multi-scale (building/neighbourhood/city) resilience perspective, delivering at the same time socio-economic benefits linked to the improvement of urban spaces’ liveability and environmental quality. Vulnerability and impact assessment represent an essential component of a simulation-based methodology aimed at increasing the potential for use of scientific results by decision-makers, through multi-hazard and dynamic impact scenarios combined with cost-benefit and multi-criteria analyses to assess the effectiveness of alternative options. The paper presents the methodological approach developed at PLINIVS Study Centre and the experimental applications implemented within recent EU and National projects, such as H2020-ESPREssO and SIMMCITIES_NA

Climate-resilient urban transformation pathways as a multi-disciplinary challenge: the case of Naples

The effects of climate change in cities are already visible with extreme events globally increasing in both frequency and intensity. It is essential to consi- der the impact of urban regeneration strategies on local microclimatic conditions in order to guide urban planning and design in a resilient key. The complex ma- nagement of information required to define adequate intervention strategies at a local level is a growing challenge for public administrations. The paper presents the first results of the ongoing H2020 project CLARITY (2017-2020) aimed at developing climate services for the integration of adaptation measures in urban redevelopment actions focused on activities performed in partnership by the UNINA team and the City of Naples, one of the project’s case studies

On the simulation of the seismic energy transmission mechanisms

In recent years, considerable attention has been paid to research and development methods able to assess the seismic energy propagation on the territory. The seismic energy propagation is strongly related to the complexity of the source and it is affected by the attenuation and the scattering effects along the path. Thus, the effect of the earthquake is the result of a complex interaction between the signal emitted by the source and the propagation effects. The purpose of this work is to develop a methodology able to reproduce the propagation law of seismic energy, hypothesizing the "transmission" mechanisms that preside over the distribution of seismic effects on the territory, by means of a structural optimization process with a predetermined energy distribution. Briefly, the approach, based on a deterministic physical model, determines an objective correction of the detected distributions of seismic intensity on the soil, forcing the compatibility of the observed data with the physical-mechanical model. It is based on two hypotheses: (1) the earthquake at the epicentre is simulated by means of a system of distortions split into three parameters; (2) the intensity is considered coincident to the density of elastic energy. The optimal distribution of the beams stiffness is achieved, by reducing the difference between the values of intensity distribution computed on the mesh and those observed during four regional events historically reported concerning the Campania region (Italy)

Theoretical model for cascading effects analyses

Abstract In case of exceptional events of natural or anthropogenic type, the elements at risk (people, buildings, infrastructures, economy, etc.) are often hit by sequences of 'cascading events', function of time and space, caused by the triggering event (earthquake, landslide, volcanic eruption, fire, electric failure, etc.). Generally, sequences of events can involve the same element at risk, and the combined effects of cascading phenomena can strongly amplify the impact caused by single events in terms of extension of the affected area and damage level. The final impact on the territory can be significant and require to be carefully assessed in terms of emergency planning and management. This paper discusses from a theoretical point of view the modelling needs and the main issues to be taken into account in the development of simulation tools aiming to include cascading effects analyses to effectively support decision-makers in their preparedness and disaster mitigation strategies in the framework of emergency planning at local, national and international level. The model aims at developing cascading effects scenarios at different level of detail, depending on the availability of inventory/exposure data for the different categories of elements at risk and hazard/impact models for the various hazard sources. It has been developed within EU-FP7 SNOWBALL project (Lower the impact of aggravating factors in crisis situations thanks to adaptive foresight and decision-support tools, 2015–2017)

The mitigation of volcanic risk as opportunity for an ecological and resilient city

The paper outlines some of the results of SPeeD project, funded by EU, Campania Region and National Department of Civil Protection. The research is aimed at the definition of impact scenarios resulting from the eruption of Vesuvius and Campi Flegrei and the development of strategies to reduce the damage on the built environment. The issues related to the identification of technical solutions for mitigating the impact on buildings and infrastructure, to the socio-economic benefits arising from widespread interventions on the territory, as well as to the drafting of preparatory guidelines for the implementation of regional regulations and local building codes for volcanic risk-prone areas, have been developed at PLINIVS Study Centre of University of Naples Federico II. The methodological approach for the definition of appropriate technologies aimed at reducing the impact in relation to eruptive phenomena and construction types in the area is based on PLINIVS Volcanic Impact Simulation Model, a unique tool to define impact scenarios consequent to a volcanic eruption in the region, able to evaluate the cumulative effects given by the action of volcanic phenomena, such as earthquake, ash fall, pyroclastic flows and landslides. The study aims to demonstrate how the application of appropriate technologies for retrofit interventions or new constructions, aimed at reducing the vulnerability of building components, represents at the same time an opportunity to encourage a diffuse redevelopment of the territory driven by energy and environmental efficiency issues

Analysis of Ordinary Buildings on the Island of Ischia (Italy) for a Seismic Impact Assessment

Ischia is a quiescent volcanic complex, characterized by several periods of activity, also of explosive typology. Each year, seismic stations detect few low-energy events, although in the past severe earthquakes occurred, causing extensive damage. The last significant seismic event, with a magnitude of 3.91, occurred on 21st August 2017, again in the municipality of Casamicciola. The hazard constituted by seismic phenomena is compounded by a high exposed value, in terms of population and buildings. From 1861 to today, the resident population has increased considerably, from 23,511 to 62,831 units, to which are added 4 million tourists a year. The high risk of the Ischia territory highlights the need to bring the sustainable planning at the centre of the debate, considering the vulnerability of the area. In this perspective, an application aimed at assessing the seismic impact scenario induced by a single seismic event is illustrated below. The aim is to show a methodological approach able to quantify the resources necessary for emergency planning and organization of operational intervention

Multicriteria Fuzzy Analysis for a GIS-Based Management of Earthquake Scenarios

Objective of this article is the formulation andthe implementation of a decision-making model for theoptimal management of emergencies. It is based on theaccurate definition of possible scenarios resulting fromprediction and prevention strategies and explicitly takesinto account the subjectivity of the judgments of prefer-ence. To this end, a multicriteria decision model, basedon fuzzy logic, has been implemented in a user-friendlygeographical information system (GIS) platform so asto allow for the automation of choice processes betweenseveral alternatives for the spatial location of the investi-gated scenarios. In particular, we have analyzed the po-tentialities of the proposed approach in terms of seismicrisk reduction, simplifying the decision process leadingto the actions to be taken from directors and managers ofcoordination services. Due to the large number of vari-ables involved in the decision process, it has been pro-posed a particularly flexible and streamlined method inwhich the damage scenarios, based on the vulnerabilityof the territory, have represented the input data to de-rive a vector of weights to be assigned to different de-cision alternatives. As an application of the proposedapproach, the seismic damage scenario of a region of400 km2, hit by the 2009 earthquake in L’Aquila (Italy),has been analyzed

Seismic and energy retrofitting of residential buildings: a simulation-based approach

The topic of the high seismic vulnerability of housing stock in Italy is back again at the center of political, economic, social and scientific-technical debate following the seismic crisis that struck Marche, Umbria and Lazio regions in 2016. These events have once again raised the need for a massive retrofitting program at National and Regional level, addressing the majority of the existing building stock, realized for 60% prior to the adoption of the first seismic code (Law 64/74), in a territory characterized north to south by high levels of seismic hazard. In recent years, different kinds of tools have been implemented to allow the simulation of natural hazards’ impacts on the built environment and to support strategic choices both in the field of emergency management and resilience-based urban design and planning. Nevertheless, an integrated set of instruments for a quantitatively informed decision support is still missing. Within EU-FP7 CRISMA project, an integrated DSS (Decision Support System) application has been developed, with a set of tools and functionalities addressing the main aspects involved in the decision-making processes for natural hazards preparedness and response