Impact of Vertical Ground Excitation on a Bridge with Footing Uplift

Ground motions recorded in the epicentral region of an earthquake often have a strong vertical component with dominant high frequencies. Damage to bridges in near-source regions due to strong vertical ground motion has been reported. The beneficial effects of footing uplift on structural performance in form of reduction of seismic response of structural members have been confirmed in previous research. The uplift of bridge piers has been utilised in a very limited number of bridge structures, e.g., the South Rangitikei railway bridge in New Zealand. However, the near-fault seismic behaviour of bridges with footing uplift has been even less addressed. In this study shake table investigations were carried out on the response of a single-span bridge model with footing uplift subjected to simultaneous vertical and horizontal excitations. Near-fault ground motions recorded in the Canterbury earthquake sequences of 2010 and 2011 were used. The experimental results show that inclusion of vertical ground motions produce stronger axial force in the pier and larger bending moment in the deck. Concurrent horizontal and vertical excitations may also cause more frequent footing uplift than the solely horizontal excitations.     

Agricultural brokers

Pigs worked as brokers of agrarian life in the early medieval west in two ways. First, they converted organisms and spaces that humans did not directly exploit into a ‘commodity’ that humans did value. And the material work that pigs did made possible a second kind of brokerage, this one conceptual: the animals facilitated (or provoked) ways of seeing local phenomena in the context of wider ecological and social systems. Pigs’ ability to make use of a range of habitats, and humans’ interest in exploiting that work despite the trouble that pigs routinely caused, demonstrated that seemingly small things could influence and illuminate early medieval economies, social status, justice, and even metaphysics.     

Bringing Back the (B)order: Post‐9/11 Politics of Immigration,Borders, and Belonging in the Contemporary US South

Abstract: Post 9/11, debates about borders, immigration, and belonging have reached a new intensity in the US South. The temporal overlap of growing immigration to the South since the late 1990s and growing nativist sentiment across the US since 9/11 has led southern communities to fuse new regional racial demographics to new national border anxieties. This convergence enables southern political elites to address the changing contours of local communities through recourse to national imperatives of border security, all the while avoiding an explicit language of race in a thoroughly racialized debate. In an analysis of recent political maneuvers in the South, this article examines what happens when debates about nation, community, and borders are relocated to southern spaces heretofore absent in discussions of immigration. It argues that legislative actions against immigrant populations in southern states are virulent and multi‐scalar border policings in which concerns about the social and cultural boundaries of southern communities, new racial projects across the South, and post‐9/11 immigrant anxieties across the US become inseparable. To conclude, it discusses the theoretical insight that this critical assessment of the South's new border projects offers vis‐à‐vis understandings of, and struggles against, exclusion, racism, and social injustice.     

Waves,Floods, Currents: The Politics and Poetics of Water in Social Movement Analysis

The task of conceptualising social movements draws on a wealth of watery images, from protest waves and political currents, to imagining mobilisations as tides, ripples, cascades or high-pressure hydraulics. Called upon to analyse complex processes, these waters have a life of their own, carrying analytical implications while extending a relationship to water that is never only symbolic and is material, embodied and historical. This article explores the ways water is “enrolled” to understand movements, to advance three arguments: first, these use familiar water morphologies to naturalise particular, located understandings of political change and social form; second, they imply normative claims and ideological affinities regarding political struggle; third, this has implications for our relationship to water, echoing the abstract and alienating “modern water” of capitalist world-ecology. The article considers how critical water knowledges and subjectivities, often sustained by social movement spaces, indicate possibilities of a being-otherwise with water and its meanings.     

Explaining perceptions of a technological environmental hazard using comparative analysis

This study addresses one of the main research problems in the area of environmental hazard risk—to explain why perception of threat from the same hazard varies between groups. We argue that the cultural theory of risk, explicitly place-contingent ways of life and worldviews that support those ways of life, goes a long way towards explaining risk perception differences in the communities of Kinuso, Fort Assiniboine and Barrhead Alberta. Fifty-five in-depth interviews were conducted within these communities; three of the four communities are closest to the Alberta Special (hazardous) Waste Treatment Facility. A regional donut pattern of interviewee concern is partially explained as differential attachment to ways of life like farming, tourism and hunting for the concerned and amenity-proximate rural living for the unconcerned. These relationships are further supported by worldviews like distrust and sensitivity to equity for the concerned and the price of progress for the unconcerned. Though this study is not about siting process per se, detailed conversations about the siting process indicate that the perceptions of risk (as concern) in the operational phase of this hazard were solidified early on and are likely difficult to change.