A Novel Procedure for Simplified Nonlinear Numerical Modeling of Structural Units in Masonry Aggregates

ABSTRACT

Historical centers are always composed of masonry building aggregates often designed without respecting seismic design criteria. The current seismic Italian code does not foresee a clear calculation method to predict their static nonlinear behavior. For this reason, in this article the seismic response of structural units into masonry aggregates has been predicted through a simplified modeling approach. The implemented procedure has been calibrated on the results of a numerical model performed by using the Equivalent Frame Method (EFM), implemented within a Finite Element Method (FEM) calculation program, used to investigate a basic building compound representative of the constructive techniques developed in the past decades in the Southern Italy.

First, the whole aggregate has been modeled and analyzed in the nonlinear static field in order to evaluate the seismic behavior of both intermediate and head structural units.

Later on, the seismic response of these structural units, considered as isolated structures, has been assessed by considering in simplified way their position in the aggregate, as well as the influence of other constructions.

Finally, the achieved results on the above single analysis cases have been compared with those deriving from the investigation of the whole building compound, allowing to confirm the effectiveness of the proposed novel analysis procedure.     

A Microtremor Survey in the Area Shocked by the ML 5.2 Salò Earthquake (North Italy): An Empirical Approach to Determine the Effects of Ground Motions

In this work, the results of a quick microtremor survey performed in the municipalities situated in the epicentre area of the Ml 5.2 2004 Salò earthquake (North Italy) are presented. The aim of this study is to understand if the large amount of damage caused by the event (about 215 million euros only in the areas near to the epicenter) is correlated more to the local surface geology conditions or to the vulnerability of ancient Italian historical centers.

A preliminary seismic zonation was carried out in 5 villages including about 30 measurements of microtremors analyzed by the Nakamura technique (hereinafter HVNR). The points of measurement were carefully selected considering sites located both near damaged buildings and over different local geology conditions (alluvium deposits, fluvial-glacial deposits, debris fans and rock). In order to strengthen the HVNR results and to evaluate the reliability of the Nakamura analysis, a comparison with spectral ratios calculated on earthquakes (hereinafter HVSR) recorded at the strong motion station of Vobarno was made. In general, the outcomes of the survey highlight a possible correlation between local geology conditions and ground motion amplification for different frequency bands. In order to check if this evidence is linked with the damage, a series of macroseismic intensity values were collected for different zones of the investigated area, and a nonparametric correlation approach was used to establish a possible correlation between damage and ground motion amplification for selected frequency bands. The results show, from a statistical point of view, that in the area surrounding the epicenter of the November 24, 2004 mainshock, the damage pattern is not strongly dependent upon the local surface geology but more correlated to the low quality of the civil structures present in the area, including old buildings of the last century.     

Banal and everyday (inter)nationalism: French and Italian anarchist exiles in London, 1870s–1914

This article explores the anarchists' multilayered theoretical and practical engagement with the concepts and performance of nations, nationalism and national belonging, by applying the frameworks of banal nationalism (understood as an ideology) and everyday nationhood (the daily practices in which nation and nationhood are enacted) as analytical categories, to investigate the Italian and French anarchist exile groups in London between 1870 and 1914. Adopting these theoretical categories proves fruitful in probing the anarchists' perception and enactment of the idea of nation and national belonging, contributing to the literature on the relationship between pre-1914 socialist movements and (inter)nationalism and highlighting the specificity of anarchism therein. Using Fox and Miller-Idriss's four categories of everyday nationhood, we show that while the anarchists explicitly subverted the everyday performance of nationhood, redeploying it along internationalist lines, some forms of attachment to the national did endure and were in fact not always contradictory with anarchist internationalism. Looking at the exilic rituals of this intensely diasporic group thus complicates the simplistic but still pervasive view of a monolithic ideological internationalism and rejection of the national on the part of anarchists.     

The site of Al-Qurainiyah: Topography and phases of an early Islamic coastal settlement on Failaka Island

This paper presents the latest finds from the early Islamic site of Al-Qurainiyah on Failaka Island, Kuwait. Trenches opened to the west of the main late Islamic village led to the identification of residential buildings and a workshop located along the shoreline, while the pottery assemblage suggests a permanent occupation from at least the seventh century CE to the early ninth century CE. The last two years of excavations allowed us to uncover archaeological contexts that seem to indicate a previous occupation, dating to the late Hellenistic period (second century BC). The long-term occupation, strategic position of the settlement facing a wide and well-sheltered lagoon, as well as the installation of a stable settlement in the same period of Al-Qusur—the main early Islamic site of the island—seem to suggest the interpretation of Al-Qurainiyah as a landing place used both in the early Islamic period and beforehand.     

GOVERNMENT QUALITY AND THE ECONOMIC RETURNS OF TRANSPORT INFRASTRUCTURE INVESTMENT IN EUROPEAN REGIONS

Transport infrastructure investment is a cornerstone of growth‐promoting strategies. However, the link between infrastructure investment and economic performance remains unclear. This may be a consequence of overlooking the role of government institutions. This paper assesses the connection between regional quality of government and the returns of different types of road infrastructure in the regions of the European Union. The results unveil the influence of regional quality of government on the economic returns of transport infrastructure. In weak institutional contexts, investment in motorways—the preferred option by governments—yields significantly lower returns than the more humble secondary road. Government institutions also affect the returns of transport maintenance investment.     

Subjectification in Times of Indebtedness and Neoliberal/Austerity Urbanism

How can we analyse the (re)emergence of squatting in relation to the current housing crisis in Italy? Centred on the case of Rome, the paper theorizes this return as resulting from processes of subjectification in the housing sector linked to the raising of indebtedness as a main dispositif of capitalism under neoliberal/austerity urbanism agendas. The political economy‐oriented literature on neoliberal/austerity urbanism is bridged with the post‐Marxist approach of Maurizio Lazzarato. Debt is seen as the archetype of social relations, shaping and controlling subjectivities, making the “work on yourself” essential to the reproduction of (indebted) society. However, given the circular nature of power, indebtedness can be generative of new processes of subjectification aimed at subverting the same power relation. In this sense, the paper operationalizes the conceptualization of Foucauldian subjectification recently proposed by Judith Revel, emphasizing how subjectification always results from (1) an action/gesture and (2) a consequent deconstruction of the identity.     

Archaeometric Study of Volcanic Lithic Objects from The Longola (Poggiomarino) Protohistoric Site,Southern Italy: Regional Versus Extra‐Regional Provenance

The Longola protohistoric village (spanning from the late Middle Bronze Age to the sixth century bc ) is a perifluvial settlement located in the Sarno River floodplain to the north‐east of Pompeii (southern Italy) and east of the Somma‐Vesuvius volcano. A great abundance of artefacts have been found at Longola and in the neighbouring areas, including a variety of volcanic stone objects, mainly related to building and to the manufacture of ordinary tools and instruments. The aim of our work is to characterize lithic objects (lava pebbles and millstones) and to understand their geological provenance by petrographic and geochemical studies. Compositions of millstone samples (porphyritic phonolitic tephrites) and of a set of pebbles (mainly phonolitic tephrites, leucite–shoshonites and trachytes) are compatible with the Somma‐Vesuvius magmas erupted before 8 ka bp . For the trachyte lithics, an additional source from the Accademia lava dome (Phlegrean Fields) cannot be ruled out. Among the pebble samples, a rhyolite and a poorly evolved trachyte clearly lie outside the compositional variation of the Somma‐Vesuvius and other volcanoes of the Naples area (e.g., Ischia and the Phlegrean Fields) and emphasize an extra‐regional provenance. Ponza Island is the best candidate for the provenance of the above two outlier samples.     

Microstoria,Pacific History,and the Question of Scale: Two or Three Things That We Should Know About Them

This article is prompted by the recent debate on the so-called crisis in the humanities, and the related call for historians to change direction by returning to history of the longue durée. While pointing out that the ‘crisis’ is more influenced by the changing political economy of the tertiary education sector than by specific historiographical practices, I suggest that small-scale analysis remains compatible with global history approaches. Articulating a parallel examination of Pacific historiography and the Italian variant of microhistory, the article argues that the latter provides fertile stimuli for Pacific history. In particular, I maintain that integrating social analysis can serve to counterbalance the over-emphasis on cultural aspects found in much Pacific historiography.     

Seismic Vulnerability Assessment of the Urban Building Environment in Nablus,Palestine

ABSTRACT

This article describes a specifically developed framework to produce a seismic physical vulnerability model of residential buildings in Nablus (Palestine) within the European project SASPARM2.0. Based on the structural taxonomy of the territory, two different forms were defined to collect geometrical and structural data of buildings by different stakeholders (citizens and practitioners). This data was then employed to produce fragility curves using the mechanics-based procedure SP-BELA. To estimate seismic risk, the developed fragility model was combined with a hazard curve for the corresponding location. The described procedure is implemented in a WebGIS platform that allows to georeference and assess the surveyed buildings and define retrofitting strategies. Finally, the article carries out a comparison between the fragility curves of buildings in Nablus and the ones calculated for similar building typologies within a UNDP Jordan project aiming at the integrated risk assessment in Wadi Musa and surroundings.