Nonlinear Response of RC Framed Buildings with Isolation and Supplemental Damping at the Base Subjected to Near-Fault Earthquakes

The nonlinear seismic response of base-isolated framed buildings subjected to near-fault earthquakes is studied to analyze the effects of supplemental damping at the level of the isolation system, commonly adopted to avoid overly large isolators. A numerical investigation is carried out with reference to two- and multi-degree-of-freedom systems, representing medium-rise base-isolated framed buildings. Typical five-story reinforced concrete (RC) plane frames with full isolation are designed according to Eurocode 8 assuming ground types A (i.e., rock) and D (i.e., moderately soft soil) in a high-risk seismic region. The overall isolation system, made of in-parallel high-damping-laminated-rubber bearings (HDLRBs) and supplemental viscous dampers, is modeled by an equivalent viscoelastic linear model. A bilinear model idealizes the behavior of the frame members. Pulse-type artificial motions, artificially generated accelerograms (matching EC8 response spectrum for subsoil classes A or D) and real accelerograms (recorded on rock- and soil-site at near-fault zones) are considered. A supplemental viscous damping at the base is appropriate for controlling the isolator displacement, so avoiding overly large isolators; but it does not guarantee a better performance of the superstructure in all cases, in terms of structural and non structural damage, depending on the frequency content of the seismic input. Precautions should be taken with regard to near-fault earthquakes, particularly for base-isolated structures located on soil-site.     

The Industrial District and the 'New' Italian Economic Geography

The industrial district is one of the theoretical concepts by which Italian economic geography has redefined a large part of its scientific and methodological status. The successful of industrial district is linked to the explanation of the Italian model of light industrialization, that is to the role played by small firms in Italian manufacturing industry. Nevertheless, it is worthwhile to know that industrial district was introduced as a theoretical paradigm to stress the territoriality of the production process and the gain of productiveness and innovativeness for the firm which sources from the embedding of economic activity within the local society where the production takes place. Support for this approach is found in the Marshallian external economies. This article addresses the importance of industrial district from the point of view of this neo-Marshallian reading of the organization of production. This framework of reference provides the basis for the formulation and implementation of local policies which recast traditional economic, social and infrastructural ones as specialist policies aimed at the creation of the institutional and environmental conditions for the competitiveness of places.     

World on fire: the politics of napalm in the Global Cold War

This essay discusses the ways in which napalm contributed to the militarisation of global landscapes during the 1960s and 1970s, shaped distinctly by the interrelated geopolitical dynamics of the Cold War, decolonisation, and the rise of global public opinion against napalm and other weapons of terror. Using case studies and primary documents from British Archives, I argue that napalm played a significant role in shaping multiple military landscapes during this period, not just in terms of its direct effects on people, places, and the natural environment, but as a result of the moral, cultural, and political consequences of those effects.     

Fighting for Trieste: nationalism and political violence at the edge of the Iron Curtain

Between 1945 and 1954, the Italian and Yugoslav governments staunchly disputed national sovereignty of Trieste and northern Istria. Although scholars have extensively studied the diplomatic dimension of what became known as the ‘Trieste question’, only a few have devoted attention to the Italian government’s aggressive strategy toward the city from 1945 to 1954. This article examines the Italian politics of nationalism in Cold War Trieste by investigating the interactions between the central government, the Allied authorities and the local political forces that either supported or opposed Italian territorial claims toward the city. Based upon the study of Italian as well as Allied governmental records, state-led propaganda and public press, this article suggests that the central government not only tolerated but also encouraged phenomena of local political violence to oppose the Communist threat and defy Allied occupation. This study ultimately proves the residual strength of nationalism as a political ideology and further elucidates the undisclosed relationship between right-wing movements and the central government during the early years of the Cold War.     

Probabilistic Calibration and Experimental Validation of the Seismic Design Criteria for One-Story Concrete Frames

This article investigates the seismic performance of one-story reinforced concrete structures for industrial buildings. To this aim, the seismic response of two structural prototypes, a cast-in-situ monolithic frame and a precast hinged frame, is compared for four different levels of translatory stiffness and seismic capacity. For these structures an incremental nonlinear dynamic analysis is performed within a Monte Carlo probabilistic simulation. The results obtained from the probabilistic analysis prove that precast structures have the same seismic capacity of the corresponding cast-in-situ structures and confirm the overall goodness of the design criteria proposed by Eurocode 8, even if a noteworthy dependency of the actual structural behavior from the prescribed response spectrum is pointed out.

The experimental verification of these theoretical results is searched for by means of pseudodynamic tests on full-scale structures. The results of these tests confirm the overall equivalence of the seismic behavior of precast and cast-in-situ structures. Moreover, two additional prototypes have been designed to investigate the seismic behavior of precast structures with roof elements placed side by side. The results of these further tests show that an effective horizontal diaphragm action can be activated even if the roof elements are not connected among them, and confirm the expected good seismic performance of these precast systems. Finally, the results of the experimental tests are compared with those obtained from nonlinear structural analyses. The good agreement between numerical and experimental results confirms the accuracy of the theoretical model and, with it, the results of the probabilistic investigation.     

Premature exit from and delayed entrance into the less developed status: An empirical appraisal of the structural funds allocation criterion

This paper investigates the impact of the main criterion employed by the European Commission for the allocation of the largest portion of Structural Funds, based on the threshold of the 75% of European Union (EU) average gross domestic product (GDP) per capita. We focus on the 2014–2020 programming period and on EU-15 regions to analyze if this criterion has penalized some of them, as a consequence of the 2004 EU enlargement, which has represented an exogenous shock in the allocation process, due to the economic backwardness of new member states. Through the application of Synthetic Control Methods and Difference-in-Differences estimators at different geographical scales, we show that regions that did not obtain the less developed status in both the programming period 2007–2013 and 2014–2020, but that would have obtained it in the period 2014–2020 without the 2004 EU enlargement, experienced a significantly lower GDP per capita growth between −10.5% and −5.7%. Conversely, territories that in the period 2014–2020 lost the less developed status, previously obtained in the time frame 2007–2013, were not characterized by a significantly lower economic growth, providing some evidence of the effectiveness of the safety net.     

Nobel laureates at the Stazione Zoologica Anton Dohrn: phenomenology and paths to discovery in neuroscience

The practice of science usually involves more than a solitary genius in a solitary room, coping with the problem of her/his life. From the second half of the 19th century onwards, scientific research, especially in the field of the Natural Sciences, has grown into a more and more complex practice, which often entangles very special needs, in terms of research objects, techniques, sources, and perspectives. A few special places, such as the Stazione Zoologica di Napoli, have represented in this period the focal points of an ever growing international scientific network, promoting independent research, exchange and diffusion of novel practices and techniques and unrestricted confrontation. The so-called "Naples experience" has been cited by a large number of renowned scientists of the last two centuries as a key moment in their scientific life. Here we have tried to test it against the experience of three great scientists par excellence, i.e. three Nobel laureates (T. H. Morgan, Otto Warburg, J. D. Watson). The different experiences they have had at Naples represent, in our view, three different moments of the professional life of almost every scientist. Therefore, we have chosen to present them as a phenomenology. The final section is dedicated to a survey of the Zoological Station's contribution to neurosciences, especially to the Naples experience of the Nobel Prize winner Sir Bernard Katz and his assistant Ricardo Miledi, between 1965 and 1970. Their work on the squid at Naples allowed probing and quantitative refinement of results already obtained on different animals and contributed to reinforce the long lasting neurophysiological tradition of the institute.