Capacity Design of Coupled RC Walls

Capacity design aims to ensure controlled ductile response of structures when subjected to earthquakes. This article investigates the performance of existing capacity design equations for reinforced concrete coupled walls and then proposes a new simplified capacity design method based on state-of-the-art knowledge. The new method is verified through a case study in which a set of 15 coupled walls are subject to nonlinear time-history analyses. The article includes examination of the maximum shear force in individual walls in relation to the total maximum shear force in the coupled wall system, and subsequently provides recommendations for design.     

Numerical Study on the Peak Strength of Masonry Spandrels with Arches

This article presents a numerical study on the force-deformation behavior of masonry spandrels supported on arches which are analyzed using simplified micro models. The model is validated against results from quasi-static cyclic tests on masonry spandrels. A large range of spandrels with different arch geometries, material properties, and axial load ratios are studied. The numerical results are compared to peak strength values predicted with an existing mechanical model. Finally, estimates for the initial stiffness and the spandrel rotation associated with the onset of strength degradation are derived.     

Governing Social Cohesion in Shrinking Cities: The Cases of Ostrava,Genoa and Leipzig

Social cohesion always appears more frequently as a policy goal of the European strategy that promotes the integration of spatial, economic, and social dimensions of growth. This comprehensive approach also has to deal with the social consequences of demographic change, tackle urban poverty, and guarantee access to amenities in isolated neighbourhoods. Such objectives represent specific challenges for shrinking cities, where processes of population decline, job losses and economic constraints as well as financial restrictions create a much more complicated starting position and might make the achievement of the social cohesion even more difficult than in non-shrinking cities. Set against this background, this paper analyses the efforts of three shrinking cities (Ostrava, Genoa, Leipzig) to promote social cohesion under the condition of urban shrinkage, and examines which policies are being promoted to solve problems such as ethnic segregation, ageing, and socio-spatial inequalities. The results show that even though shrinkage does lead to increased challenges for social cohesion, the attempts of policies to tackle them still appear to be secondary priorities, sectoral rather than comprehensive, and involve a certain delay.     

High-skilled Return Migration and Knowledge-based Development in Poland

It is by now well known that return migration of the highly skilled can have a significant impact on knowledge-based development in the regions to which they return. Whereas previous research has mainly focused on developing and newly industrializing countries, this paper looks at high-skilled return migration in an East European transformation economy, namely Poland. In our paper, we propose an analytical framework which integrates migration theory and regional development perspectives. Based on narrative interviews with high-skilled return migrants in Warsaw and Poznań, we show that high-skilled return migrants have an impact on economic development by acting as both investors and innovators, i.e. that they transfer and successfully integrate financial means as well as different types of knowledge into these local economies. Furthermore, the Polish example illustrates that social relations and institutional context are crucial in understanding how high-skilled return migrants contribute to knowledge-based development.     

Educating Citizens or Defying Federal Authority? A Comparative Study of In‐State Tuition for Undocumented Students

Recent years have witnessed a proliferation of state government policies addressing immigration‐related issues. This article addresses an example of state policy regarding immigration: since 2001, 11 state legislatures have granted undocumented high school graduates in‐state tuition status should they wish to attend public post‐secondary schools, while 18 others have considered, and rejected, the same policy. We argue that these outcomes are largely explicable by the manner in which the policy is presented and debated within state legislatures, especially the terms in which policy targets are socially constructed and state jurisdictional authority is framed. We apply this framework to two states (Kansas and Arkansas) that, in spite of demographic institutional similarities, reached different outcomes on in‐state tuition bills. The different outcomes can be traced to the manner in which policy deliberations in Kansas focused on positive evaluations of undocumented high school students, portraying them as “proto‐citizens,” while in Arkansas debate became centered on the state's jurisdictional authority to enact such a policy, an issue frame that effectively killed the legislation. This article suggests the importance of both social constructions and issue framing when state legislatures become the lead actors in crafting immigration policies.     

Relativité et réalité Nottale, Simondon et le réalisme des relations

The exhaustion of the controversy about realism in physics, which is an epistemological consequence of the radical discrepancy between quantum mechanics and relativity, indicates the irrelevance of the traditional opposition between realism and antirealism. Since its purpose is the reunification of microphysics and macrophysics by the means of fractal space-time and scale relativity, Laurent Nottale's theory of Scale Relativity gets over this opposition by postulating the ontological value of the physical relations. The physicist's relational realism hence confirms spontaneously the intuitions of Gilbert Simondon's philosophy of nucleation, which considers the necessary recognition of the ontological value of relations in order to establish the «great synthesis of relativity and quantum physics».