Assessment of Effects of Reductions of Lateral Stiffness along Height on Buildings Modeled as Elastic Cantilever Shear Beams

A simplified model useful for assessing economic losses due to moderate seismicity events in urban areas has been developed by studying the behavior of buildings before yielding their structural system, allowing for nonuniform stiffness along their height. In particular, buildings are modeled as cantilever shear beams with uniform mass and parabolic reduction of lateral stiffness. This particular stiffness distribution is relevant, as it could be expected to occur in buildings where earthquake action is a critical structural design criterion. The equation of motion governing the dynamic behavior of the proposed model is solved analytically, finding mode shapes in terms of first and second zero-order Legendre functions. The solution is verified by comparing it with results obtained from fine mesh finite element models. The effect of reducing the lateral stiffness is then studied in the first five modes of vibration. Results include modal periods, mode shapes, modal participation factors, and derivatives of mode shapes. In general, it is found that effects of reduction of lateral stiffness in mode shapes are moderate when the lateral stiffness in the free end is smaller than about seventy percent of the lateral stiffness at the fixed end, but become significant for larger reductions. Effects are particularly important for the derivative of the mode shapes, which could play a significant role in estimating interstory drift demands in buildings. Model usefulness is showcased by analyzing a test case where both acceleration and drift demands are assessed by considering uniform beams and beams with parabolic stiffness variation, finding notable improvements by considering the latter.     

Indifferent but Mobilized: Rural Politics during the Interwar Period in Eastern and Western Europe

What did peasants discuss at party meetings? Were they mobilized by ethnic politics or indifferent to them altogether? The end of the First World War brought about universal male suffrage in much of Europe, and with it the process of mass politics began. The concept of national indifference is important in understanding interwar politics, because this period is often studied teleologically with attention focused on extremism and nationalism as the primary mobilizing issue

Agrarian movements have been under-researched, and when Agrarians have been studied, it has been through the prism of elite politics. This comparative paper seeks to redress this omission by looking at grassroots rural politics. The interwar countryside was marked by profound political, economic and social transformation but also in terms of what Robert Paxton has described as the ‘triple crisis of the countryside’ – worsening economic conditions, the declining status of the countryside and inadequate political representation. The paper will explore how reform and crisis impacted how agrarian politics functioned at a local level by asymmetrically comparing cases from Romania, Poland and Ireland, with the final case helping to contextualize Eastern Europe within the wider European experience This paper argues that the rural population was mobilized, but primarily in the context of local issues rather than national ethno-political questions. Local party organization was, to paraphrase James C Scott, the site ‘of an exchange of small arms fire’ in rural class conflict, as questions regarding the control of public space, generational conflict and power within the village mobilized peasants. Thus, I argue that it was the underlying socio-economic issues that mobilized the rural population, not nationalism. The dynamics of these conflicts were shaped by local economic, political and social power dynamics, and by using indifference as a concept, we can look more deeply at interwar politics from a grassroots perspective and develop a more nuanced understanding of local, national and European politics.     

Culture-led urban regeneration policies in the Ibero-American space

ABSTRACT

This article examines cultural policy strategies supporting urban regeneration, focusing on its particular characteristics in the Ibero-American context. We start by developing a systematic contrast between the different circumstances that have led to the emergence of these strategies in the Ibero-American sphere and in other parts of the world. Our examination of the Ibero-American regenerative experience also includes a consideration of the paradigmatic cases that arose initially in the Iberian Peninsula and the typological analysis of subsequent Latin American experiences. The consideration of all these different elements ends up providing a global vision of the specificity of the phenomenon in its Ibero-American context.     

Modelling Resource Values and Climate Change Impacts to Set Preservation and Research Priorities

ABSTRACT

Climate change impacts will increase in their frequency and severity in the coming decades, resulting in compromised integrity or destruction of thousands of heritage resources. Efforts are needed to identify, record, and study resources that will be affected. To set research and preservation priorities, the vulnerability of resources to climate change impacts and their importance to scientific research, preservation, and other resource values needs to be understood. We advocate a modelling approach which predicts the location, timing, and severity of climate change impacts; identifies resources at risk, their resource values, and opportunity costs; and prioritises research and preservation options based on these assessments. The need for this approach is illustrated with examples from two coastal areas subject to different impacts and hosting different types of heritage resources: the Atlantic coast of Georgia in the United States and the Wismar Bight along the Baltic Sea in northern Germany.     

Space,time and history in the Polish People’s Republic: the trilogy Sami swoi,Nie ma mocnych,Kochaj albo rzuć

Abstract

The article discusses the meanings of popular culture, authenticity and history in People’s Republic of Poland. As an example it uses a popular film trilogy. The trilogy Sami swoi, Nie ma mocnych and Kochaj albo rzu? (‘All friends here’, ‘Take it easy’ and ‘Love or leave me’) was shown in Polish cinemas between 1967 and 1977. The reviews were written just after the premières. The article uses the concepts of time and space elaborated by Mikhail Bakhtin and Doreen Massey to analyze the different chronotopes of the films. It analyses both the films and the reviews as strategies of creating authenticity and creating cultural meanings: the meaning of history and the meanings of rurality. I will show how history and present, memory and society are interwoven in the light of popular production. In addition, I will emphasize the diverse interpretation possibilities resulting from this micro-historical view and the transnational critique of modernism highlighting the small and local which emerged throughout Europe in the 1970s.     

Views,use and reception of visualisations of development proposals impacting cultural heritage

Visualisations of land-use projects have become an important part of the planning process. Using a survey of heritage professionals’ attitudes towards visualisations as a starting point, this article addresses tensions between the expressed usefulness of visualisations and critical attitudes towards the lack of ‘objectivity’ of visual representation and the risk of manipulation for strategic purposes. Moving from the survey, the article discusses how visual representations of development proposals became part of a Norwegian public dispute over the expansion of a shopping centre in a historic town. Furthermore, our aim is to introduce a social semiotic approach for analysing visualisations at historic sites. Finally, we discuss some theoretical implications of negotiating visualisations, with emphasis on the recent debate about representational and non-representational theories in heritage studies.