A Simplified Model to Evaluate the Dynamic Rocking Behavior of Irregular Free-Standing Rigid Bodies Calibrated with Experimental Shaking-Table Tests

A simplified model to evaluate the dynamic rocking behavior of free-standing irregular rigid bodies under earthquake-induced forces is proposed. The model analyzes the response of a three-dimensional irregular rigid body using a numerical approach that considers a critical section and two equivalent rectangular rigid blocks. Experimental shaking-table tests were carried out on modular prototypes, which allow the replication of representative mass distributions, sizes, and/or slenderness ratios for typical objects. The tests were used to calibrate the numerical model. It was found that the dynamic behavior under irregular conditions (asymmetrical shape and/or non-uniform mass distribution) can be estimated with the appropriate geometric and density considerations.     

The Origins of the Concept of ‘Palaeolithic Art’: Theoretical Roots of an Idea

This paper explores the origin and theoretical roots of the concept of ‘Palaeolithic art’ in the late nineteenth and early twentieth centuries (1895–1906). It identifies three main sources for this concept: the Western category of ‘art’, the idea of evolution and the notion of primitive. This article shows how the traditional conception of ‘Palaeolithic art’ is a particular case of the wider idea of ‘primitive art’, a category that was born as an attempt to harmonise the notion of ‘primitive society’ and the nineteenth-century bourgeois concept of ‘art’. Additionally, I discuss this traditional conception as the source of a number of ideas that have persisted in our way of interpreting Palaeolithic images until recently, including the understanding of prehistoric images through the lens of the modern notion of ‘art’, their interpretation in symbolic-religious terms and their formal definition based on the idea of naturalism.     

Seismic Vulnerability of an Inventory of Overturning Objects

A methodology is presented for assessing the probability of overturning under the action of ground motions of given intensities, and the expected values and standard deviations of damage produced by overturning of objects in a group or inventory exposed to the same seismic event. We apply this methodology to one example of the typical contents located on the base (i.e., free-field) of a middle-class house or apartment. A detailed inventory was gathered, and recent well-recorded accelerograms at the site were used to compute the rocking response of every object. Vulnerability functions for the whole inventory computed at four different sites in terms of epicentral distance and site effects show large differences between them.     

Seismic Analysis of Masonry Gravity Dams Using the Discrete Element Method: Implementation and Application

Much research in recent years has focused on the seismic analysis of concrete and earthfill dams, and few works have addressed the case of masonry dams. The structural behavior of masonry dams is controlled essentially by its discontinuous nature, which may induce significant nonlinear response during an intense earthquake. In this article, a numerical tool based on the Discrete Element Method is presented, aimed at the static, dynamic, and hydromechanical analysis of masonry gravity dams. The use of discontinuous models is mandatory for the study of failure mechanisms involving the masonry discontinuities, the dam-rock interface or the rock mass joints. The Discrete Element Method is able to assemble continuous and discontinuous meshes simultaneously in the same model, providing a versatile tool to consider various assumptions and levels of analysis, ranging from simplified to detailed structural representations. A comprehensive study of the seismic behavior of Lagoa Comprida Dam, located in Portugal, is presented. Both continuous and discontinuous models were developed to assess the main failure mechanisms, including overstress, partial and global sliding, and overturning.     

Eros and Dionysus

Abstract

Liberty was once praiseworthy because it enabled a free choice for the good. Technology recasts the classical link between liberty and virtue by making human well-being depend on technological advance. Till recently, technology signified human mastery over nature. But now virtual reality offers itself as a substitute for nature. Unlike machines which hold us at a distance, it draws us in with images. It no longer shapes the soul indirectly through the effects of using machines, but involves the soul directly. The modern attempt to bracket the soul has brought it back virtually. The argument between fight and flight is at a standstill. Instead, the irony which many lament as a feature of postmodernity can provide a distance from the technologies which have made themselves necessary.     

Autonomy,Erasure, and Persistence in the Urban Gardening Commons

Collective gardening spaces have existed across Lisbon, Portugal for decades. This article attends to the makeshift natures made by black migrants from Portugal's former colonies, and the racial urban geography thrown into relief by the differing fortunes of white Portuguese community gardening spaces. Conceptualising urban gardens as commons‐in‐the‐making, we explore subaltern urbanism and the emergence of autonomous gardening commons on the one hand, and the state erasure, overwriting or construction of top‐down commons on the other. While showing that urban gardening forges commons of varying persistence, we also demonstrate the ways through which the commons are always closely entwined with processes of enclosure. We further argue that urban gardening commons are divergent and cannot be judged against any abstract ideal of the commons. In conclusion, we suggest that urban gardening commons do not have a “common” in common.     

From smart growth to European spatial planning: a new paradigm for EU cohesion policy post-2020

Formally initiated in 1989, European Union (EU) cohesion policy (ECP) has since passed through a series of metamorphoses, along its five programming periods, while becoming the most financed EU policy. As its name indicates, its initial goals were earmarked for promoting economic and social cohesion, following the intentions expressed in the Single European Act. Since then, from a policy strategy intervention point of view, ECP has shifted into a financial tool to promote investment for growth and jobs. In the meantime, European spatial planning (ESP), which had its debating pinnacle with the release of the European Spatial Development Perspective, by 1999, has declined in interest and narrowed into a novel notion of Territorial Cohesion. In this challenging context, this article analyses the implementation and main impacts of ECP and proposes a new strategic paradigm, built around a novel ‘ESP’ vision, backed by the main pillars and dimensions of territorial development and cohesion. More particularly, we suggest that the current rationale for a smart, sustainable and inclusive growth could instead fuel an alternative strategic design based on a cohesive and sustainable development vision: green economy, balanced territory, good governance and social cohesion.     

Thinking Politically about Sustainable Development in the Tropical Forests of Latin America

This article examines a number of factors which facilitate the adoption and success of policies and projects to promote grassroots sustainable development – that is, the sustainable, multiple use of forests at the community level, including aspects of local self-reliance and control of economic resources. I will argue that the extractive reserve legislation in Brazil and community forestry projects in Mexico and Peru depended on the formation of pro-grassroots development coalitions. The exact make-up of those coalitions depended on three factors: (1) the initial disposition of key governmental and dominant class actors to such policies; (2) the intensity of local conflicts and the extent of community organization; and (3) the involvement of international actors. The cases suggest that in the absence of serious government or upper class opposition, the adoption and durability of such policies and projects can be promoted by the formation of a coalition of organized communities, domestic non-governmental organizations (NGOs), some allied government agencies, and support from international actors. However, when key government agencies and socio-economic élites are fundamentally opposed to sustainable development initiatives at the grassroots level, much higher levels of community organization, conflict, and domestic and international support appear to be necessary.     

Familiar Kinship? Palaeogenetic and Isotopic Evidence from a Triple Burial of the Cogotas I Archaeological Culture (Bronze Age,Iberian Peninsula)

This paper examines the identification of kinship relations in archaeological multiple burials and advocates the application of different methods and lines of research to clarify such issues in relation to funerary practices. Recognizing family relationships – an important task in research on prehistoric societies – is especially complicated and interpretations have often been made without an adequate empirical basis. Bioarchaeological, isotopic and DNA analyses applied to the triple burial of Los Tolmos (Cogotas I archaeological culture, Iberian Bronze Age) have provided direct information on this issue. In this respect, the new results also imply the need to consider gender constructs in greater depth and to be more open‐minded towards other forms of relationship in the past beyond the traditional heteronormative nuclear family.