Direct Displacement-Based Seismic Design of Eccentrically Braced Steel Frames

A series of eccentrically braced frames (EBF) are designed and subjected to nonlinear analyses to highlight ambiguities and differences in current seismic design provisions for EBF structures. This provides motivation to implement better guidance for the checking of local displacement demand considerations and move towards a displacement-based design approach. A recently proposed direct displacement-based design (DDBD) procedure for EBFs is then described and further developed in this article through the calibration of a spectral displacement reduction factors that relate the displacement of an inelastically responding structure to that of the equivalent linear representation used in the DDBD of EBFs. Such an expression is calibrated as part of this study using an experimentally validated numerical model also proposed here for the EBF links such that the actual hysteretic behavior of the links is well represented. The DDBD guidelines are applied to EBF systems from 1–15 stories in height and their performance is verified via nonlinear dynamic analyses using two different sets of design spectrum compatible ground motions. The results of the study indicate the robustness of the proposed DDBD method in limiting the interstory drifts to design limits for a variety of EBF systems with short links, thus demonstrating that the proposed DDBD method is an effective tool for seismic design of EBFs.     

Matéo Maximoff's La Septième fille: A Roma Testimony of Internment and Assimilation

Set in the internment camp at Lannemezan where the author and his family spent two years, Matéo Maximoff's La Septième fille gives a voice to a minority group that has suffered from negative stereotypes since its arrival in France in the Middle Ages. In that work, Maximoff, the first authentic Roma novelist, blends folklore and oral tradition with historical fact, chronicling the conditions in the camp at Lannemezan even as he spins a supernatural tale worthy of the most gifted of conteurs. Informed by historical sources and ethnographic studies, this article suggests that La Septième fille may be read as a metaphor for the internment of the Roma by the Vichy regime and the policies aimed at ‘socialising’ and forcing them to become sedentary, policies that began during the Third Republic and that continued well into the twentieth century. La Septième fille is one of the rare literary works (along with Didier Daeninckx's La Route du Rom, 2003) to treat the little-known Vichy initiative of interning Roma—the majority of whom were French citizens—in 31 camps around France.     

Ancestral Puebloan mtDNA in context of the greater southwest

Ancient DNA (aDNA) was extracted from the human remains of seventy-three individuals from the Tommy and Mine Canyon sites (dated to PI-II and PIII, respectively), located on the B-Square Ranch in the Middle San Juan region of New Mexico. The mitochondrial DNA (mtDNA) haplogroups of 48 (65.7%) of these samples were identified, and their frequency distributions were compared with those of other prehistoric and modern populations from the Greater Southwest and Mexico. The haplogroup frequency distributions for the two sites were statistically significantly different from each other, with the Mine Canyon site exhibiting an unusually high frequency of haplogroup A for a Southwestern population, indicating the possible influence of migration or other evolutionary forces. However, both sites exhibited a relatively high frequency of haplogroup B, typical of Southwestern populations, suggesting continuity in the Southwest, as has been hypothesized by others (8, 9, 29, 45 and 57). The first hypervariable region of twenty-three individuals (31.5%) was also sequenced to confirm haplogroup assignments and compared with other sequences from the region. This comparison further strengthens the argument for population continuity in the Southwest without a detectable influence from Mesoamerica.     

‘Living Liminality’: everyday experiences of asylum seekers in the ‘Direct Provision’ system in Ireland

Mechanisms to exclude people seen as ‘other’ which were once considered exceptional have now become normal. Global patterns of increased state security lead to people on the move or seeking protection being detained, dispersed and deported, their lives treated as ‘waste’ or ‘reject’. The Irish ‘Direct Provision’ system is part of an increasing network of liminal, or threshold, spaces, situated between and within borders, in which such people are detained or forced to wait in often inhumane conditions and often for years at a time. Based on ethnographic participatory photographic research, this article explores the ways in which imposed liminality plays out in people’s everyday lives in ‘Direct Provision’. The article looks at how liminality is lived in spatial and temporal terms and develops the idea of ‘ontological liminality’, a means of expressing the ways in which a chronic sense of fear, insecurity, invisibility and a highly controlled existence are lived and internalized; it also shows the ways in which people negotiate this imposed liminality through everyday practices, creating various forms of attachment, engagement and belonging. Exploring the concept of liminality in this context holds broader implications not only for understanding experiences of people waiting or held in the increasing number of refugee camps, border zones and detention centres in and beyond Europe, but also provides insight into the architectures of exclusion created by states to contain or exclude the ‘other’.     

PREDICTING LUNAR ECLIPSES IN NORTHERN LATITUDES BY NAKED EYE OBSERVATION

We investigate methods which may have been found appropriate for predicting lunar eclipses in northern Europe, where naked-eye astronomy has to be adapted to conditions, which are different from those found at lower latitudes and in places with less cloud cover. The ecliptic is lower in the sky, and transient phenomena cannot reliably be observed under these astronomical viewing conditions. We consider those techniques, which only require the use of objects made of wood, stone and soil, which use no written records, and which require no understanding of celestial mechanics. We show that it should have been possible to answer the question ‘Is there going to be a lunar eclipse, either tonight or tomorrow night?‘ with surprising accuracy. We include an analysis of the nature of some of the artefacts, which may have been helpful in doing so.