1,721,047 research outputs found
Arrival Infrastructuring at a Southern European Gate: Public Action and Spaces in Palermo, Italy
Full text linkThis article investigates how the interplay of different actors has shaped the arrival of newcomers in the city of Palermo in Southern Italy. The recent debate on arrival infrastructures is currently developing in Central Europe, where arrival has been experienced as part of a reception crisis starting in 2015. Within this framework, Southern European contexts represent interesting fields of observation, both for the way arrivals are deployed and for the type of public action that has been mobilized. Here, arrivals are often linked to further departures; infrastructuring processes involve a wide range of in/formal actors, which can be inscribed into a Southern (European) definition of public action. Stemming from two research projects in urban studies, the article unpacks how different actors channeled newcomers' arrivals between 2015 and 2020. Methodologically, the work builds on qualitative methods and fieldwork, as well as on documents and discourse analysis. It highlights the interplay of a robust pro-hospitality political discourse, a broad-and partly informal-public action around it, everyday infrastructuring practices, and how they spatialized into diverse arrival spaces. In Palermo, public action takes roots in a specific urban historical trajectory of the city, through actions and spaces that lie between formality and informality and that often also reveal resourceful aspects
Fast Seismic Assessment of Existing Precast Structures by Means of Fragility Curves: The PRESSAFE Methodology
Full text linkIn the present paper, a wide stock of internal and perimeter one-story precast frames has been investigated by incremental dynamic analysis, so providing the analytical fragility curve for each frame category for different fundamental vibrating periods. The interaction with nonstructural elements has been studied by considering three types of perimeter walls adopted in precast buildings. The analytical expressions provided for both severe damage and collapse states allow the definition of a new methodology that can be used for a fast assessment of the fragility curves of existing one-story precast buildings with a generic fundamental vibrating period
Evaluation of the variability contribution due to epistemic uncertainty on constitutive models in the definition of fragility curves of RC frames
Full text linkIn the framework of uncertainty propagation in seismic analyses, most of the research efforts were devoted to quantifying and reducing uncertainties related to seismic input. However, also uncertainties associated to the definition of constitutive models must be taken into account, in order to have a reliable estimate of the total uncertainty in structural response. The present paper, by means of incremental dynamic analyses on reinforced concrete frames, evaluates the effect of the epistemic uncertainty for plastic-hinges hysteretic models selection. Eleven different hysteretic models, identified based on literature data, were used and seismic fragility curves were obtained for three different levels of maximum interstorey drift ratio. Finally, by means of analysis of variance techniques, the paper shows that the uncertainty associated to the hysteretic model definition has a magnitude similar to that due to record-to-record variability
How the Presence of Newly Arrived Migrants Challenges Urban Spaces: Three Perspectives from Recent Literature
Full text linkThis article explores the notion of arrival spaces in the recent urban studies literature, and it outlines three emerging perspectives on their role and the associated processes and complexities. Recently, within changing migratory trajectories, the dimension of arrival has gained increasing relevance, and scholars have discussed the growing complexity underpinning it. Within this framework, some contributions reflect on the role of arrival spaces, which currently represent a rapidly changing research subject. However, by the term ‘arrival space,’ authors refer to various types of space, and the article argues that a clearer reference to the spatial dimension of arrival is needed. Spaces are contexts where different actors interact and intervene in the city, and their understanding represents a preliminary step for future research. In this sense, this contribution aims to unpack the previous decade’s debate on arrival spaces. It outlines three main perspectives: The first discusses the role of trans-local contexts, working as nodes in international migration networks; the second follows the debate on arrival neighborhoods; the third suggests that arrival spaces may be defined as all those parts of the urban fabric with which newcomers interact at the moment of arrival. Finally, drawing from this review, the article underlines that arrival spaces are not only specialized areas with migrant newcomers’ concentration, but they may also be ordinary urban spaces that temporarily work for arrival. Hence, future research should further deepen this perspective and more explicitly investigate the relation of arrival spaces to the city and its actors
Studio e monitoraggio delle deformazioni del territorio con l’ausilio delle metodologie satellitari applicate alle reti geodetiche.
No full textUniversità di Padova, Dipartimento di Architettura, Urbanistica e Rilevamento
Analisi di VULNERABILITA’ SISMICA di un CAPANNONE industriale prefabbricato in c.a. mediante differenti analisi
No full textThe earthquake that has struck in 2012
territories of Emilia region with high concentration
of precast industrial building, have highlighted the
fragility of this typology of construction. If on one
hand they have exhibited in the past to be one of
the most efficient structural solutions for vertical
loads, on the other hand they showed to be very
sensitive to the effects of horizontal actions. In this
regard, in the areas affected by the strong May
2012 earthquakes, most of the existing structures
were designed to support the horizontal wind
action and not the seismic one, prescribed by
regulation only recently in these areas.
In the present work, we reported the results of
the seismic vulnerability analysis of an industrial
reinforced concrete precast building, achieved by
dynamic analysis on a finite element model
designed to be as close as possible to the real
structure, in terms of stiffness, mass and strength
distributions. Particular attention was put, during
the modelling, at the choice of the finite element
for simulating the connections between the
structural elements and between structural and
non-structural elements, in order to capture
relative displacements or possible sliding
phenomena. Both spectral response dynamic
analysis and non-linear time-history were
conducted, obtaining different safety levels. The
results obtained were finally commented
Five fields of action: Research, built heritage, entrepreneurship, school, cultures
No full textIn front of the structural social, environmental and economic problems, a wide range of projects emerges in the Old Town of Taranto. These projects gather the work of local and higher-level actors, associations and private entities, to rethink the present and the future of the city. This contribution argues that, despite the number of initiatives, many of them are lacking the preconditions to root and grow. Therefore, after interpreting the key findings of the project-mapping, this contribution identifies five areas of possible intervention, which can create a frame of possibilities for current and future projects by dialoguing with each other. These are objects in the boundary of seemingly incompatible areas of interest and actions, and precisely because of their ‘lateral’ position, they constitute spaces of possibility and interference
Post-suburban arrival spaces and the frame of ‘welfare offloading’: notes from an Italian suburban neighborhood
Full text linkDrawing upon the debates on ‘suburbanisms’ and ‘arrival space’, this article explores the complexities for welfare governance in multiethnic peripheries. The paper bridges two themes of the contemporary ‘suburban century’: the intensified global migration flows and the peripheral condition of suburbs worldwide; the work refers to the Municipality of Pioltello, a multiethnic suburban area in Milan’s region. This double-sided perspective reveals governance dynamics, here discussed through the concept of ‘welfare offloading’. In the observed neighborhood, governmental complexities disclose profound interdependencies with the region’s urban core and across municipalities; welfare tensions are ‘offloaded’ from the central core to peripheral regions
Definition of seismic performances and fragility curves of unanchored cylindrical steel legged tanks used in wine making and storage
Full text linkThe introduction of stainless-steel legged tanks is rather recent, and their use increased in the last decades in exponential way, especially in food industry and agricultural applications since they proved to be simple to prefabricate and transport, easy to clean and chemically inert. Despite their worldwide diffusion also in high seismicity areas, most of them were not designed with earthquake-based criteria as emerged by the catastrophic consequences and heavy losses observed, even recently, after several major earthquakes. By means of incremental dynamic analyses on the finite element models of 140 winemaking and storage legged tanks, the present paper, evaluates the main features of the dynamic response and for each vessel provides the lognormal cumulative fragility functions, for three different limit states of each vessel. Then, for each limit state, by means of nonlinear regression analyses, the median and the dispersion parameters of the best fitting lognormal function of every tank were statistically elaborated in order to define the response surfaces of the parameters. The response surfaces, provided for 3-, 4- and 5-leg unanchored tanks, are defined on the basis of few geometrical tank data. The analytical expressions provided in the paper, represent a practical and useful tool to directly calculate the fragilities of legged vessel. These, obviously, will allow the fast assessment of the seismic vulnerability of the tanks in agricultural facilities located in seismic prone areas
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