Experimental characterization of the constitutive materials composing an old masonry vaulted tunnel of the Paris subway system

A significant proportion of the Paris metro tunnels comprise a masonry vault built out of stone blocks and mortar joints, and sidewalls and slabs made of unreinforced concrete. In order to provide the necessary data for future structural evaluation, an extensive laboratory testing programme has been conducted to characterize the materials of the tunnel separately, i.e., mortar, stone, and concrete. The tests, carried out on specimens taken from cores extracted from a 1930s tunnel, enabled to determine the mechanical properties, including direct tensile, shear strength, and mode I fracture energy, as well as the properties of the stone-mortar interface. Results show that the masonry mortar joints could reach 10 cm in width, and that blocks of stone varied in composition and porosity, thus producing a wide range of mechanical properties. The concrete was composed of large-sized aggregates and showed low stiffness and strength. Based on these experimental results, ratios between mechanical characteristics are hereby proposed. Perspectives on the use of this experimental data in a finite element model are then discussed.     

Universalism within: The tension between universalism and community in progressive ideology

Social-democratic parties face a dilemma between the universalist ethos of their socialist tradition and the nationalism that they share with the other political actors of the state where they act. In this paper, we examine comparatively the position of the Spanish party Partido Socialista Obrero Español (PSOE) and the Catalan party Esquerra Republicana de Catalunya (ERC) on three political debates that pertains to the link between welfare and identity in Spain. We show how these parties experience opposite tensions between nationalism and the universalism of their left-wing ideology. Whereas ERC calls for a withdrawal from the Spanish system of social security, the PSOE advocates imposing on Catalonia a symmetric form of solidarity with the rest of Spain, despite recognising the region's different identity. Above all, both parties take identity for granted as a pre-political factor that ‘naturally’ justifies differential treatment, according to ERC, or equalising federalism, in the case of the PSOE.     

Fish Processing in Italy and Sicily During Antiquity

The aim of this paper is to present a short overview of the production and trade in marine resources in Italy and Sicily during Antiquity. As the results of this research have already been published in detail elsewhere, the aim of this short contribution is to summarise the most important data and to highlight some of the research questions that remain unsolved. The paper follows a chronological order, from the pre-Roman period to the 2nd century AD, as well as a geographical one, starting with Sicily, moving on to Magna Grecia in what is now southern Italy and then moving on to the rest of Italy. A major consideration, highlighted here, is that in many cases we are dealing with data from old excavations and precise archaeological information is rarely available.     

Multi-method (TL and OSL), multi-material (quartz and flint) dating of the Mousterian site of Roc de Marsal (Dordogne,France): correlating Neanderthal occupations with the climatic variability of MIS 5–3

Roc de Marsal has yielded numerous remains of Mousterian occupations, including lithics, fauna and combustion features. It was made famous by the discovery of the skeleton of a Neanderthal child. Given the need to date the sequence, TL and OSL were applied on heated flints and quartz, and OSL on unheated quartz. Chronological results combined with palaeoenvironmental data – faunal remains and micromorphological features in the sediments from the cave, pollen proxies and faunal remains from the region – allowed us to place climate variations in southwest France on a numerical time scale. Denticulate Mousterian occupations were dated to the middle of MIS 4 (65–70 ka) and Quina layers either to the very end of MIS 4 or to MIS 3. Interestingly, a faunal pattern showing a mix of red deer, roe deer and reindeer was found to have occurred during MIS 4, which was shown to be consistent with data from other similar sites in southwest France.     

Estimation of Vertical Floor Displacement Using a Wavelet De-Noising Method

The horizontal response of structural and nonstructural systems during seismic events has been studied for a long time. However, the effect of the vertical response of floors on building contents and nonstructural systems has still remained a topic of concern. A wavelet de-noising method along with the experimental data obtained from a full-scale test at E-Defense is used to estimate the vertical floor displacement of a five-story steel moment frame building in base-isolated and fixed-base configurations. Vertical displacements of slabs and beams are calculated from the experimental data and formulated based on their out-of-plane dominant frequencies. A curve fitting approach is then carried out to estimate vertical displacements at floors and stories. In these tests, partition wall damage such as buckling of studs occurred at slab displacements of about 1 in.