A Bayesian approach to rapid seismic vulnerability assessment at urban scale

The seismic vulnerability of city centers is commonly assessed by extending the study methods applied to single buildings to urban aggregations. This approach is not always applicable at territorial scale, as it is uneconomical in terms of time and costs. An innovative method provides reasonable large-scale a priori estimation of parameters not directly evaluable from the exterior of buildings by elaborating values which can be measured from the outside. Those parameters are treated as continuous variables, by assigning them a suitable probability density function. The Bayesian approach is adopted, which allows the update of initial hypotheses by using new data gathered during on-site surveys. In this regard, a rapid survey form for the on-site data collection is proposed. An example of its application to a façade of a building structural unit in Santo Stefano di Sessanio in L’Aquila province (Italy) is proposed, showing promising preliminary results for buildings belonging to Italian historical centers.     

The Influence of Dowel-Bearing Strength in Designing Timber Pegged Timber Joints

ABSTRACT

The employment of timber pegs in timber structure joints is a widespread technology in the field of timber frame building in the United States, where the Timber Frame Engineering Council has published a special Standard to supplement the National Design Specification for Wood Construction. The authors have been studying the possibility of supplementing the Eurocode 5 design formulas, thought for timber joints with metal connectors, with specifications needed for a reliable design when employing timber pegs. The field of application envisaged is that of restoring timber structures and results obtained until now are quite encouraging. In this step of the research, more attention has been paid to deformation process: fir and chestnut samples have been tested to determine their dowel-bearing behavior with steel and ash timber peg while double-shear plane joints made of the same wood species, and fastened with steel as well as timber pegs, have been analyzed.     

Storytelling as Method in Spatial Planning

Abstract

Drawing on the case of the Wageningse Eng in the Netherlands, this paper considers the role of “storytelling” within spatial planning practices. It moves away, though, from seeing it as merely a model of spatial planning, where “storytelling” is sometimes used to justify planners' ideals for the landscape, or a model for spatial planning, which pushes for a normative use of “storytelling” as a means of encapsulating local knowledge and the views of those who live in, and use, the landscape. Rather, the paper engages “storytelling” as a method for revealing how formal planning practices may be destabilized by more vernacular narratives seeking to subvert dominant discourses and processes. In doing so, it seeks to not only show the contested nature of participatory planning within the Netherlands, but also the ways in which narratives—as revealed via such a method—construct specific positionalities with real implications for notions of inclusivity within planning practices.     

Inside Checkpoint 300: Checkpoint Regimes as Spatial Political Technologies in the Occupied Palestinian Territories

As a part of the architecture of the Israeli occupation of the Palestinian Territories, the Israeli government introduced in 2005 a series of so‐called terminal checkpoints as “neutral border crossings”, to minimise the impact of these barriers on Palestinian lives through a different design and the use of several machines, such as turnstiles and metal detectors. In this article, we analyse terminal Checkpoint 300 in Bethlehem, framing it as a spatial political technology aimed at controlling the movement of Palestinians. More specifically, we investigate the interactions between Palestinian commuters, Israeli soldiers/security guards and the machines operating inside Checkpoint 300. We conclude by suggesting that Checkpoint 300 is a porous barrier whose regime is produced, reproduced but also challenged by such interactions, and that, despite the new “neutral design”, Checkpoint 300 is a place still filled with tension and violence, often exercised by the machines and their “decisions”.     

Digital Photogrammetry for Documentation of Maritime Heritage

Documentation of maritime heritage is essential for its protection, and for reference in restoration and renovation processes. These functions become problematic in the case of historical ships and boats that lack lines drawings. The purpose of this paper is to describe a procedure for creation of lines drawings based on the shape analysis of surviving historical boats or their small-scale models with the help of reverse engineering (RE) techniques. The paper describes how digital photogrammetry and the iterative method were used to analyze the shape of three historical boats: Tomahawk, Refola and Nada. The application of the proposed procedure produced the lines drawings of the boats as its result. The accuracy of the 3D CAD model obtained with the photogrammetric technique was verified by comparing it against a more accurate 3D model produced with the help of a RE laser scanner. The examination of the resulting lines drawings proves that the digital photogrammetry process and the proposed iterative method are adequate tools for developing lines plans of boat models. The research offers the methodological basis for the creation of an archive of lines drawings of historical boats. Such an archive would provide reference for philologically correct restorations, and permit definition and classification of distinctive elements of various types of historical boats, particularly those produced in the Campania Region.     

Disciplined Mobility and the Emotional Subject in Royal Dutch Lloyd's Early Twentieth Century Passenger Shipping Network

This paper examines the disciplined mobility and emotional geographies of “between‐deck” passengers in Royal Dutch Lloyd's early Twentieth Century passenger shipping network. Specifically, it is concerned with the ways in which the network was established and with the efforts made to maintain it. It is found that such a disciplinary network furthers the firm's goal of shipping healthy and productive bodies for corporate profits and that transhipment facility Lloyd Hotel in Amsterdam was integral to the performance and maintenance of such a transnational disciplinary network. The key consequence of such disciplined mobility was the creation of an emotional passenger‐migrant subject shaped in relation to the power of corporate, cultural and other authorities in maritime travel and migration. In identifying this historic network of disciplined mobility and its emotional subject, this paper seeks to reveal the emotional geographies relating to mobile subjectivities and the power relations associated with their historically significant travels.     

<Emphasis Type="Italic">Corrales de Indios</Emphasis> (Lithic Structures) in Tandilia,Argentina: A Global Study

In the central-southeastern area of Buenos Aires Province, Argentina, lies a mountainous area of low height in Tandilia that contains important outcrops of quartzite and granite. A large number of buildings are made of massive blocks of rock, some of them with a surface of over 1 ha. In addition to these completely artificial constructions are other structures that are semi-natural, having been made in places with special topographical characteristics and complemented with dry-stone walls. Scanty written documents allow us to attribute some of the constructions to an age before the permanent settlement of the Creole population. In the Tandilia Sierras these structures are commonly known as “corrales de indios” (Indian corrals). This designation involves a double prejudice with regard to function and cultural affiliation. Out of a total of 22 structures, we analyze a group of 4 that were excavated to use to review the written documents.     

CASH TRANSFERS AND POVERTY REDUCTION IN CHILE*

ABSTRACT The headcount ratio in Chile has declined from 40 percent to 14 percent since 1987. However, most analysis of this reduction uses national and regional poverty statistics. In contrast, we employ poverty mapping methodologies to find heterogeneity in the effectiveness of transfers across counties. To better understand this variation, we explore the roles of characteristics of the local population, structural features of the county, and geography. The greatest reductions in poverty occur in rural households, yet population characteristics and geography are also important. These findings suggest that targeting at low levels of aggregation can deliver further reductions in poverty.     

Pushover Analyses of Hand-Loaded Steel Storage Shelving Racks

Among the various types of industrial solutions used to store goods and products, the light duty hand loaded shelving rack (SR) typology represents a very popular solution for domestic applications, libraries and for superstores/markets open to the public. Despite the limited cost, an eventual collapse could result in significant damage of stored goods, injuries, and potentially the loss of human life, with the possible consequence of a long suspension of commercial activities. This reflects directly on the great importance of a correct design that, despite the large use of SRs, is nowadays developed with approaches characterized by inadequate levels of reliability.

A research program on SRs is currently in progress in Italy, with the aim of improving the rules for both static and seismic design and this article presents a combined experimental-numerical study. Both component and pushover tests have been carried out, that are shortly summarized. Overall frame response has been simulated by means of advanced finite element software able to capture key features of the nonlinear response of slender frames with mono-symmetric cross-section members.