A Fully Graphical Approach for Limit State Analysis of Existing Structures: Application to Plane Elastic-Plastic Bended Structures and to Plane Masonry Arches

ABSTRACT

When classical elastic analysis fails to model correctly the structural behavior of historical masonry structures because of the brittle, rigid, anisotropic, and inhomogeneous characteristics of their building material, equilibrium-based limit state analysis constitutes an efficient alternative for their structural assessment. The lack of knowledge about the history of loading makes the actual state of stresses impossible to determine for these statically indeterminate structures. However, Plastic Theory provides a powerful theoretical framework that defines in a rather simple way the structural safety level. The lower-bound theorem of plasticity can be applied using graphic statics because it ensures that equilibrium and yield conditions are respected when applying specific constraints to the nodes of the reciprocal diagrams.

This article focuses on limit stat analysis of statically indeterminate structures by means of geometrical considerations using graphic statics reciprocal diagrams. For linear-bended structures, we show that: (1) the conditions of stability can be defined graphically by constructing safety domains; (2) collapse modes can be identified and related to specific reciprocal polygons; and (3) the exact value of the collapse load factor can be deduced graphically from the diagrams. Finally, we extend these results to plane masonry arches in relation with the classical thrust line approach.     

Escape into the City: Everyday Practices of Commoning and the Production of Urban Space in Dublin

In Dublin there are many needs and desires which are not met, or excluded, by the pattern of high rent, the commodification of social/cultural life, and the regulation of public space. Against this dynamic, Dublin has seen a number of experiments in urban commoning: people collectively finding ways of opening up space in order to do what they want. This might be as simple as wanting a space to work, to make food or to show films. Rather than trying to change this situation by appealing to existing institutions, these new urban commons are characterized by particular groups of people devising practical ways of escaping the forms of “enclosure” which limit what can happen in the city. This article takes a “militant research” approach to explore the potentials and limitations of these experiments in urban production and organization.     

Persian Studies and the Military in Late Imperial Russia (1863–1917): State Power in the Service of Knowledge?

This article pursues the goal of going beyond Saidian notions of Orientalism and Said's assumption of the “complicity of knowledge with power” to reach back to Foucault's initial postulations on the role of institutions and the intellectual in the interplay of power/knowledge relations. The article concentrates on the role of Russian military Oriental studies institutions and Orientologists in the context of discourses (the promotion of Russkoe Delo, the juxtaposition of Russia with the West and the Orient, etc.) that existed in late Imperial Russia and influenced the accumulation and development of scholarly knowledge on the Orient. Therefore, the significant contribution of the military domain to Russian Oriental studies on both the institutional and individual levels are examined from the angle of intra-Russian discourses in the period from the establishment of the Asiatic Section of the General Staff in 1863 up to 1917.     

Reviews

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Love & loss in the 1960s

Roland Barthes observed that though there is a ‘lover's discourse’ shared by all those who are in love, it is a discourse ignored or disparaged by ‘surrounding languages’. Concerned that the discourse of heritage may participate in this closure against the ‘in love’ experience, I begin to explore ways the field of heritage studies might start speaking this language. Specifically, I ponder the ways that a young Chinese woman in the film Days of being wild, following the breakup of a love affair, becomes locked in a landscape of lost love that is populated with objects sticky with affect, objects which although they transmit painful affects nevertheless bind her by a dynamic that Lauren Berlant terms ‘cruel optimism’. I then turn to imagine the way a Balinese house compound gateway might, in a similar way, have become impregnated with affects relating to victims of the 1965–1966 killings in Bali and how, for those left behind, it might assume the ability to ‘presence’ a lost one. Archaeology and heritage studies have great potential to foster empathy with the experience of past others, but this calls for a sophisticated understanding of how objects become imbued with affect and how they transmit it.