Experimental Dynamic Testing and Numerical Modeling of Historical Belfry

The experimental characterization of historical bell towers and wall belfries can provide important information for the calibration of numerical models as well as to implement proper restoration strategies. Within this framework, the presented study is concerned with the experimental dynamic assessment of an ancient belfry dating back to 1537. The structure is part of the “Santa Maria in Aracoeli Church” (Rome, Italy), an important heritage construction placed on the summit of the Capitoline Hill, close to the building that hosts the Major’s office. Several field tests have been conducted using accelerometers, and records obtained under different dynamic loading scenarios have been examined. Moreover, experimental accelerations have been elaborated to estimate the most important modal features of the structure and to validate a finite element model. Field tests have confirmed that severe vibrations are induced when the bells swing, and thus a slight reduction of the swing angle has been suggested in order to provide an immediate and inexpensive benefit to the structure. A new set of field tests demonstrates that the new swing angle is sufficient to reduce the induced vibrations while preserving the original sound.     

Tailors in 1950s Beijing: Private enterprise, career trajectories, and historical turning points in the early PRC

How new was the New China? This article explores the experience of Beijing tailors in the early years of the PRC in light of this question. After 1949, many long-established tailors simply continued to ply their trade in their old business premises, giving a strong impression of continuity in the social fabric of the city. They were increasingly challenged, however, by newcomers to the industry, including petty entrepreneurs who chose to invest in a socially useful trade, and the graduates of newly established sewing schools, usually women. Policy shifts from the New Democracy period through the “three anti” and “five anti” campaigns to the eve of the socialist transformation in 1956 affected old and new businesses, men and women, in different ways. Overall, the reduction in entrepreneurial freedoms that characterizes this period of Chinese business history was, in this sector of industry and commerce, most strikingly manifest in limitations on what tailors were licensed to make, which had effects on what Beijing people wore. From these various perspectives, 1949 can be seen to be a rather clear dividing line in the history of Beijing, but it was possibly a rather faint line at first, becoming darker and thicker as the 1950s progressed—or should that be “regressed?”     

High-throughput mass spectrometric analysis of 1400-year-old mycolic acids as biomarkers for ancient tuberculosis infection

The cell wall of mycobacteria includes an unusual outer membrane of extremely low permeability. This cell envelope consists of a characteristic cell wall skeleton, a mycoloyl arabinogalactan peptidoglycan complex, and related hydrophobic components that contribute to the cell surface properties. In this study 1400-year-old mycolic acids as unique tuberculosis biomarkers have been extracted and identified for the first time by using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI TOF MS) and Fourier transform infrared spectroscopy (FT-IR). The data suggest that the MALDI TOF MS has potential as a rapid and reproducible technique for the detection and identification of ancient mycobacterial infections.     

Early Islamic pigments at Nishapur,north-eastern Iran: studies on the painted fragments preserved at The Metropolitan Museum of Art

Pigments appearing on ninth–twelfth-century AD-carved stucco, wall painting, and terracotta friezes excavated at Nishapur in north-eastern Iran were investigated by optical reflectance spectroscopy, micro X-ray fluorescence spectrometry (μ-XRF), X-ray diffractometry (XRD), micro-Raman spectroscopy (μ-Raman), and scanning electron microscopy (SEM). Many of the pigments identified including vermilion, red lead, hematite, limonite, carbon black, atacamite, calcite, and gypsum have been identified in previous studies of pigments used in later Islamic periods. However, a series of unusual pigments such as wulfenite, pyromorphite, phoenicochroite, and jarosite were also found in the present study. The association of kaolinite and alunite with limonite and other Fe-bearing yellow pigments points to a local provenance for these pigments. In addition, the presence of orpiment in the vermilion may be indicative that the vermilion was artificially manufactured. These findings suggest that pigment use and manufacturing during the ninth to eleventh centuries in Nishapur was still in a trial-and-error stage and the palette known from the twelfth century onwards had not yet been systematized.     

Heritage Recycled: migration and tourism as factors in the heritage of vernacular settlements

Since the 1980s Greece has been the destination of many Albanian migrants in search of work and better living conditions. The research on which this study is based examines the case of Santorini, a small Greek island which relies heavily on tourism and is currently in the front line of migration. This paper focuses on the relationship between migrants and space, by considering the interaction between migration, tourism and heritage. Heritage brings tourism flows, tourism generates migration through the demand for labour which cannot be met by locals, and migration helps to keep heritage alive because migrants occupy the old deserted settlements and also provide the means for the revitalisation of traditional ways of production. Through research in three different locations on the island, it is suggested that, contrary to the common public perception that migrants operate in a destructive way towards the spatial, social and economic environments, they actually contribute to their revitalisation.     

The integration of action research and traditional field research to provide sustainable solutions to maintaining periurban agriculture

Maintaining periurban agriculture and prime periurban farmland has become a leitmotiv in land use planning and management around many cities in North America and Western Europe since the 1960s. This article focuses on the changing perspectives associated with these planning and management initiatives as well as changing research approaches. Initially, periurban farmland was often seen by planners as a land reserve for urban development. Subsequently, concern was expressed about maintaining the prime agricultural land resource via farmland protection programmes, especially in North America in the 1960s and 1970s. Early research into periurban agriculture involved statistical analyses of farmland losses and changing agricultural production systems, and farmer interviews to identify pressures and opportunities facing periurban agriculture. Gradually, it became clear that maintaining farmland resources and farm activities required more than just ‘protecting’ them from urbanisation. Two types of initiatives developed: (1) the construction of agricultural development plans to ensure sustainable farm development, e.g. in Quebec since 2008, in France since the mid‐1970s and more recently in Wallonia (Belgium) in 2014; and (2) a change in the research approach to support periurban agricultural sustainability. While still using interviews with farmers and other actors, more important is the emergence of action research to provide support to farmers, their neighbours, elected officials and professionals in developing agricultural development plans, with the aim of achieving a better integration of periurban agriculture into the regional urban system. This paper develops this reasoning using research in Canada, France, and principally Belgium to illustrate the argument.     

Against the Grid: The Cultural Emergence of Villas Miseria in Buenos Aires

This article traces how poverty emerged culturally in mid-century Buenos Aires. It does so by examining two contrasting models: (1) the state’s, revealed in the plans it prepared for the eradication of villas miseria (the local term for slums), (2) that of a corpus of cultural objects depicting slums between 1957 and 1963. My basic claim is that the politically motivated conceptual erasure of the slum informed its aesthetic representation. In particular, I look at Bernardo Verbitsky’s novel Villa Miseria también es América (1957), and Antonio Berni’s series of multimedia collages focused on the fictional character of Juanito Laguna (1958–1978). As my essay shows, each of these works responds to the state plans to eradicate slums. Each takes up the state’s idea of the slum as a tabula rasa, a blank slate, but inserts into this plane an excess of materiality. By looking at the shared forms of these objects, I describe how culture came to place the slum within the city’s regular grid, interrupting the linearity imagined by the state. Such a gesture will ultimately have the consequence of turning poverty into something absolutely consumable.     

The 18th-Century Baraccato of L’Aquila

ABSTRACT

This article attempts to describe a particular form of baraccata house, found in L’Aquila, Italy. The differences between this form of baraccato and the Italian traditional timber-framed (T-F) structures, the baraccato borbonico and the baraccato alla beneventana, are shown. In the upper valley of the Aterno river (Abruzzo, Italy), a few kilometers far from L’Aquila, wonderful 18^th-century examples of T-F masonry structures are present. The use of wood pervades both the poor and noble buildings. In this article, the documentary and functional features of this peculiar anti-seismic timber-based building technique, which is widespread in L’Aquila and the neighboring areas, is described. After a comparative analysis of the technique’s features, the case of three T-F buildings, belonging to three different social classes is reported, the first is the Ricci palace in Mopolino di Montereale, the second is a middle-class building, and the third is a rural one. The 1703 earthquake, which affected the upper valley of the Aterno river and the nearby city of L’Aquila, gave rise to an ante litteram anti-seismic culture. Timber was not seen as an obstacle to durability but a material to be exploited to protect buildings from earthquakes.     

A Multidisciplinary Study on the Seismic Vulnerability of St. Agostino Church in Amatrice following the 2016 Seismic Sequence

ABSTRACT

The big earthquake of August 24, 2016 and subsequent major shocks severely damaged many historic villages in Central Italy and dramatically showed the intrinsic vulnerability of the diffused architectural heritage. The St. Agostino church is one of the collapsed historical buildings, being inside the epicentre village of Amatrice. During the long seismic earthquake swarm, progressively the church was damaged and monitored. This multidisciplinary study of the damage of the church includes correlations of all the data derived from three steps geomatics surveys (3D aerial and terrestrial models): the archival drawings and images documenting previous events distressing the building, the previous strengthening intervention, and finally the seismic site response analysis (from Amatrice’s accelerometric station). Through a back analysis carried out by a finite elements model, it was possible to understand the seismic vulnerability of this historical building, in relation to the previous interventions and damage events. The proposed methodology, based on the interdisciplinary data analysis, provides useful information for the next strengthening projects of damaged historical monument.