Black Death in the rural cemetery of Saint-Laurent-de-la-Cabrerisse Aude-Languedoc,southern France, 14th century: immunological evidence

An excavation carried out in 2007 in Saint-Laurent-de-la-Cabrerisse (Aude-Languedoc, southern France), revealed a medieval rural cemetery used during the 8th–14th centuries. One hundred and forty nine graves were identified. Amongst those, three burials radiocarbon dated to the 14th century contained the remains of several individuals. No paleotraumatological evidences of violence due to warfare or to a civil massacre were identified in the exhumed skeletons. Therefore, we hypothesized that the simultaneous inhumations could have occurred during the “Black Death” outbreak or during one of its resurgences. A rapid diagnostic test for the detection of Yersinia pestis F1 antigen was applied to the nine putative plague victims to authenticate the cause of their death. Seven of the nine individuals tested from the three graves were positive to Y. pestis F1 antigen. We additionally tested fourteen skeletons from single graves archaeologically dated to the 13th–14th centuries. Four of them were positive to Y. pestis F1 antigen, thus showing a higher mortality rate due to plague than originally expected. The Saint-Laurent-de-la-Cabrerisse plague victims are the oldest samples from which Y. pestis F1 antigen has been, hitherto, identified. Few rural French cemetery containing plague victims have previously been identified and amongst them, only one dates to the 14th century. In the present report, we provide suggestive evidence of a second rural cemetery from southern France where victims of Y. pestis infection were buried. Our findings provide new information about the management of the plagued corpses during the “Black Death” in small rural communities.     

Thin-folded Shell for the Renewal of Existing Wooden Roofs

In this article, a technique for the renewal of historic building wooden roofs is presented. The solution can be used for the strengthening of existing wooden roofs against excessive lateral thrusts on the peripheral wall or for the recovery of the attics, as it allows removing the existing structural elements, such as possible wooden truss-works of no artistic value. With minor adaptations, the solution can be addressed to enhance the building seismic performance. The technique is minimally impairing on existing buildings and can be applied also in new constructions.

The technique is based on the construction of a thin folded shell, overlaying the existing pitches. Emphasis is given to lightweight folded shells, obtained by overlaying thin plywood panels on the existing roof rafters and planks, without modifying the overall architectural layout.

The technique conceptual design is discussed and a simplified analytical method is proposed, which allows for the clarification of the role of each structural component and can be adopted for the folded shell proportioning and design. The analytical results are validated against numerical results obtained with reference to some case studies. Ultimately, emphasis is given to the detailing, whose correct execution is mandatory for the success of the proposed structural intervention.     

Plague immunodetection in remains of religious exhumed from burial sites in central France

The skeletons of four Benedictine nuns and two priests were exhumed from two burial sites in central France. The corpses were dated to the 16th– 18th centuries (archaeological dating).     

Ductility of a Structural Wall with Spread Rebars Tested in Full Scale

The experimental work focuses on the ductility of the reinforced concrete (RC) seismic structural walls in buildings of mid-rise height. A full-scale five-story structural wall was tested to obtain results, still scarce in literature, without the influence of size effect. An unusual detailing with large diameter longitudinal rebars uniformly distributed in the wall length was adopted to prevent premature web rebar fracture and shear sliding. The plastic hinge length and deformations were evaluated in detail. The results show the high ductility of the wall that reached a total drift of 2.5%, larger than those usually required in design.     

Probabilistic Seismic Performance Assessment of Classes of Buildings Using Physics-Based Simulations and Ground-Motion Prediction Equations

We discuss the applicability of two different near field representations of seismic input within the capacity-demand diagram method for seismic performance assessment of classes of buildings in urban areas. The two representations of seismic input used are: (1) synthetic accelerograms obtained from 3D wave simulations of random rupture scenarios are used to estimate seismic risk, through the Monte-Carlo approximation; and (2) random realizations of elastic spectral displacement obtained through ground-motion prediction equations. The implementation of the proposed formulation in evaluating the seismic performance of two classes of buildings in the town of Sulmona, Italy, indicates that empirical ground-motion prediction equations, combined with non-iterative methods for estimating the inelastic seismic demand, can produce results comparable to the physics-based simulations.