Shear Vulnerability of Historical Reinforced-Concrete Structures

Modern buildings have been characterized by the rapid spread of reinforced concrete as a novel and versatile building material. Within the assessment of existing buildings, the most sensitive structures are those designed in the first half of the 20th century, when the theory of reinforced concrete and the detailing rules were not yet well established. This study considers the issues related to the gradual understanding of the vulnerability at a territorial scale of structural typologies designed only for vertical loads. In particular, the shear behavior of the buildings in the period between 1920 and 1960 is investigated. The shear strength control of the structural elements of an open-air stadium in Southern Italy is carried on according to Eurocode 2, the American Concrete Institute Code, ACI 318R–2008, and a method based on Arslan’s equation. The results are compared with those included in the original calculus report according to the 1930 Royal Decree-Law (RDL 18/7/1930).     

From Sorcery to Laboratory: Pandemics and Yanyuwa Experiences of Viral Vulnerability

The COVID‐19 pandemic has prompted renewed attention among health professionals, Aboriginal community leaders, and social scientists to the need for culturally responsive preventative health measures and strategies. This article, a collaborative effort, involving Yanyuwa families from the remote community of Borroloola and two anthropologists with whom Yanyuwa have long associations, tracks the story of pandemics from the perspective of Aboriginal people in the Gulf region of northern Australia. It specifically orients the discussion of the current predicament of ‘viral vulnerability’ in the wake of COVID‐19, relative to other pandemics, including the Hong Kong flu in 1969 and the Spanish flu decades earlier in 1919. This discussion highlights that culturally nuanced and prescribed responses to illness and threat of illness have a long history for Yanyuwa. Yanyuwa cultural repertoires have assisted in the process of making sense of massive change, in the form of past pandemics and the onset of sickness, the threat of illness with COVID‐19 and the attribution of ‘viral vulnerability’ to this remote Aboriginal community. The aim is to centralise Yanyuwa voices in this story, as an important step in growing understandings of Aboriginal knowledge of pandemics and culturally relevant and controlled health responses and strategies for communal well‐being.     

Mourning the Un-mournable? Political Theology Between Refugees and Religion

Since the arrival, or the attempted arrival, of millions of refugees in Europe, the performances of the Center for Political Beauty – a Berlin-based collective of artists and activists – have had a huge impact on public and political debates about Germany's migration policies. In this paper, I analyze the performance “The Dead Are Coming” in which the artists buried refugees who drowned in their attempt to enter the European Union. Drawing on Judith Butler's political philosophy of performativity, I assess “The Dead Are Coming” as a “doing” rather than a “describing” of dignity. I argue that the integration of God into the practices of mourning enables both the activists and the audience to resist the differential distribution of dignity in Europe's migration policy. Ultimately, I advocate a re-thinking of political theology in which art learns from theology and theology learns from art in order to promote dignity under de-dignifying conditions.     

不同类型传统村落脆弱性比较研究

以湘南地区作为研究单元,多元化获取数据,运用“敏感-暴露-适应”分析框架和数理模型评价法对3种类型、6个村落的脆弱程度和致脆因素进行比较研究。结果表明：①务工型强脆弱、工贸型中脆弱、旅游型微脆弱;②旅游型和工贸型属复合E-A致脆类型,务工型属均衡E-A-S致脆类型;③务工型的敏感性远大于其他类型,民俗文化和村落居民是主要敏感因子;④旅游型为强暴露、工贸型为中暴露、务工型为微暴露。城镇化和旅游开发是主要暴露因素;⑤旅游型的适应性最高,工贸型次之,务工型最差;⑥不同类型村落的致脆短板因素差异较大。     

Experimental Studies and Vulnerability Assessment of Timber-Arched Lounge Bridges

ABSTRACT

There are many preserved timber-arched lounge bridges in China and some of these bridges are hundreds of years old. The woven arch is the main bearing structure of a timber-arched lounge bridge. Few studies still exist about woven arch mechanical performance, a fact that contributes to the improper repair. This article concerns the structural performance of the woven arch. The results of experimental studies on deformation, stress distribution, force-transferring mechanism, and failure modes were presented. Two woven arch models with and without П-shape braces under symmetrical load and asymmetrical load were investigated. The results indicated that the woven arch had high bearing capacity, especially under symmetrical load. The comparison of experimental results obtained for models with and without brace showed that braces modified the failure mechanism and increased the load carrying capacity and integrity. Based on the failure conditions observed experimentally, limit criteria were defined in order to facilitate vulnerability assessment of timber lounge bridges.     

Critical Geographies with the State: The Problem of Social Vulnerability and the Politics of Engaged Research

Abstract: State interventions to govern social vulnerability highlight the complexity of contemporary states, marked by neoliberal agenda but also by progressive interventions and the desire for effectiveness. This paper draws on collaborative research with government agencies on social vulnerability in the Hunter region to assess the desirability of undertaking critical geographies with the state. We see states as contested terrains invested with the institutional capacity to mobilise diverse political projects. We argue that critical research in partnership with states is possible, as are mobilisations of the agency of state institutions to promote progressive policy development. The paper explores how we might use engaged research to intersect with the production and circulation of texts, technologies and practices within the state apparatus to achieve desirable change. While critical research with the state involves uncertainties and compromise, with no permanent resolutions, we conclude that states must remain centred in our critical conversations and praxis. In this paper we advance the case for the critical possibilities of policy‐oriented research with the state. We reflect on experiences of an engaged research project with state government agencies in the NSW Hunter Region involving the production and use of the texts and technologies as state interventions in social vulnerability. Working through the project's reflexive, collaborative methodologies and our use of critical GIS, we highlight the creation of opportunities to change how the components of social vulnerability were conceptualised, contest policymakers’ view of what was “relevant”, and shift framing rationalities and resultant state practices. As such the paper contributes to our knowledge of strategic research practices for pursuing critical, progressive projects with the state. Such engagement involves uncertainties and contingent compromise. Yet, as terrains of contestation wherein diverse political projects are assembled and propelled, states must remain centred in our critical conversations and in our critical praxis.     

OUT-OF-PLANE SEISMIC RESISTANCE OF MASONRY WALLS

Seismic vulnerability of unreinforced masonry buildings is studied by means of simplified out-of-plane collapse mechanisms that take into account connections with transversal walls. According to experimental evidence, the analysis assumes that failure is reached with a rigid body motion of a part of the facade that falls down. Two classes of mechanism are examined: the overturning of the facade due either to a vertical crack at the connection or a diagonal crack on the transversal wall, both defined resorting to a simple model of masonry fabric, viewed as a regular assembly of rigid blocks and elastic plastic joints with friction but no cohesion. The use of simplified mechanisms give rise to an explicit evaluation of the seismic resistance to changes in the geometry and in the masonry fabrics, that could be used by practising engineers. This formulation is developed for both static horizontal actions and ground velocity peak, in the belief that the latter probably gives a better approximation of seismic action, while also providing, by comparison with the results of static forces, an estimate of the behaviour factor for unreinforced masonry. Eventually, the analytical forecasts are compared with numerical results obtained by means of the distinct element method.     

Nonlinear Modeling and Mitigation of Seismic Pounding between R/C Frame Buildings

A multi-link finite element contact model reproducing Jankowski’s nonlinear viscoelastic relationships is devised and implemented for a time-history analysis of seismic pounding. The mechanical and algorithmic parameters are calibrated with a numerical test case study, represented by two single-story R/C frames. A real case study, concerning two adjacent buildings representative of a stock of R/C multi-story frame structures with insufficient separation joints at rest, is then examined. A damped interconnection-based mitigation solution consisting in linking the two structures with fluid-viscous dissipaters is proposed. The benefits of this retrofit strategy are discussed by comparison with the response in original conditions.     

Investigating Private Motorised Travel and Vehicle Fleet Efficiency: Using New Data and Methods to Reveal Socio‐Spatial Patterns in Brisbane,Australia

Australian cities have seen continued long‐term growth in private motor vehicle travel that has imposed increasing vehicle energy consumption and greenhouse gas emissions. This paper investigates the spatial patterns of vehicle energy consumption on urban areas through an analysis of vehicle travel and of vehicle fleet efficiency in Brisbane, Australia. This is achieved by combining motor vehicle registration records and Australian government's ‘Green Vehicle Guide’ of vehicle fuel efficiency database. The results of a spatial analysis of the private vehicle trip distances derived from journey to work data and fuel energy consumption associated with the private‐owned vehicles decomposed to local areas show that private vehicle energy use tends to increase with increasing distance from the city centre (e.g. central business district). This analysis demonstrates that differences in vehicle trip distances and lower proportions of high‐efficiency vehicles in the outer suburbs aggravate vehicle energy consumption in those locations. The paper further compares vehicle energy use results for Brisbane against spatial patterns of suburban socio‐economic disadvantage. The paper demonstrates that access to vehicle fleet technology may compound other forms of socio‐economic disadvantage and vulnerability.     

Large-scale Debris Flow Disasters: Hazard-Risk-Vulnerability Analysis Approach in Taiwan

Catastrophic disasters may cause irreversible damage to cultural heritage. This study identified the risk to cultural heritage sites in Taiwan posed by large-scale debris flow disasters. The cultural heritage sites that may be affected by debris flows were identified through risk identification and by using GIS. Subsequently, an on-site field survey was conducted to confirm the cultural heritage sites that are potentially vulnerable to debris flow disasters. The research findings are as follows: (a) the top three cultural heritage sites that are most affected by debris flows are municipal, county, and city monuments, historical buildings, and historical sites; (b) the number of cultural heritage sites affected is related to environmental exploitation; (c) the cultural heritage sites at high risk of being affected by disasters were primarily located in Taitung and Chiayi Counties.