Teaching about political violence: a primer on representation

Geography is not generally viewed as a ‘source’ discipline for political violence studies, but this paper begins with the presumption that geography is well disposed to teach courses on the subject. The key purpose of this paper is to demonstrate that engaging issues of political violence is useful for our pedagogy. In particular, teaching about political violence allows geography to address concerns arising from the ‘crisis of representation’. It does so in two ways. First, it provides another venue for teaching about the ‘the other’ and ‘othered places’ in our curricula. Second, it also allows geography to challenge uncritical tropes about political violence as emerging from some peoples and places and not others. As a case study this paper overviews a course entitled Militia Movements in Comparative Perspective. This course was organized around a theoretical unit and four case study units. The case conflicts were chosen to represent conflicts that crossed ideological (right/left) and geographical (Global North/Global South) divides. The course structure is overviewed and a classroom discussion that highlighted questions about representation is described and analysed. The paper concludes by reviewing current efforts to address violence in the discipline, noting problems with these efforts, and suggesting alternatives to them.     

New cultural geographies of disability: Asian values and the accessibility ideal

The ideal of a 'barrier-free environment' is promoted in developed countries as a means of increasing the independence and mobility of disabled people. The adoption of this concept for developing countries requires critical analysis. Indonesia, for example, has formulated a physical access code, but has not succeeded in the implementation. The focus of this article is on middle-class professional disabled people in cities in Indonesia. Indonesian collectivist values and unequal status that arise from the feudal system do not encourage independence. Such values and the restrictive and inadequate public infrastructures render disabled people invisible in public. The availability of maidservants and chauffeurs assists urban disabled people from the middle class. They may be professionals, who desire to be independent in mobility and other daily living activities. Ambulant disabled people are also excluded from social life due to the custom of squatting and sitting on the floor for household work and traditional socializing. As a result of these factors and the current unstable social, economic and political conditions in Indonesia, barrier-free design is not a priority in most planning and design and seems futile in its realization.     

Bristol and the eruption of memory: Making the slave-trading past visible

This article describes the work undertaken by the public authorities of Bristol to construct, for this old slaving port, a collective memory of the trade in Africans. It shows how the use of urban space is necessary to resurrect that past and implies a visual model to inform a new gaze on the city. Through intensive action on the memory of slavery, the author suggests, from the work of Paul Ricoeur, the passage from silence to 'too much memory'. This excess can be viewed as the result of a political instrumentalization linked to the requirements of the British multicutural model. Further, these actions on memory reveal distinctly divergent intentions for the different communities of the city.     

Animating the urban: an ethological and geographical conversation

Abstract

Urban animals and their political ecologies constitute an arena of geographical scholarship that has intensified in recent years. Yet, little headway has been made in terms of understanding how sentient creatures inhabit and negotiate dynamic, metabolic environments. Focusing on urban macaques in Indian cities, the paper develops a conversation between geography and ethology. Firstly, the conversation provides insights into what urbanisation might entail for animals. Secondly, it assays ways in which non-human knowledges enable rethinking what expertise counts in urban governance. Thirdly, the conversation foregrounds other spatial topologies of the urban that become evident when animals’ lifeworlds are taken into account. The paper advances efforts to animate urban political ecology in registers yet inattentive to non-human lifeworlds. It concludes by reflecting upon the purchase of such etho-geographical conversations generate for political ecologies of urbanisation.     

Shake-Table Tests of Confined-Masonry Rocking Walls with Supplementary Hysteretic Damping

A shake-table investigation is conducted on a 40% scale model frame-wall system to validate the concept of rocking walls as primary seismic systems. The rocking wall concept was implemented on confined masonry walls, but the findings can be extended to any rocking wall system. As the inherent damping of this system is low, a pair of supplemental steel hysteretic energy dissipating dampers is used at the base of the wall. It is concluded that with careful detailing, damage is not only eliminated but the structure re-centers itself following a large earthquake.     

Optimum Design Approaches for Improving the Seismic Performance of 3D RC Buildings

In this article, a number of design approaches for 3D reinforced concrete (RC) buildings are formulated in the framework of structural optimization problems and are assessed in terms of their performance under earthquake loading. In particular, three design approaches for RC buildings are considered in this study. In the first, the initial construction cost is considered as the objective function to be minimized. The second one is formulated as a minimization problem of the torsional response, while a combined formulation is also examined as the third design approach. The third approach is considered with two distinctive formulations. According to the first approach, the torsional behavior is minimized by minimizing the eccentricity between the mass and rigidity centers, while the second one is achieved by minimizing the eccentricity between the mass and strength centers. It is shown that the optimized designs obtained according to the minimum eccentricity of the rigidity center behave better in frequent (50/50 hazard level) and occasional (10/50 hazard level) earthquakes, while the designs obtained according to the minimum eccentricity of the strength center formulation was found better in rare (2/50 hazard level) events. Designs obtained through a combined formulation seem to behave equally well in the three hazard levels examined.     

Probabilistic Calibration and Experimental Validation of the Seismic Design Criteria for One-Story Concrete Frames

This article investigates the seismic performance of one-story reinforced concrete structures for industrial buildings. To this aim, the seismic response of two structural prototypes, a cast-in-situ monolithic frame and a precast hinged frame, is compared for four different levels of translatory stiffness and seismic capacity. For these structures an incremental nonlinear dynamic analysis is performed within a Monte Carlo probabilistic simulation. The results obtained from the probabilistic analysis prove that precast structures have the same seismic capacity of the corresponding cast-in-situ structures and confirm the overall goodness of the design criteria proposed by Eurocode 8, even if a noteworthy dependency of the actual structural behavior from the prescribed response spectrum is pointed out.

The experimental verification of these theoretical results is searched for by means of pseudodynamic tests on full-scale structures. The results of these tests confirm the overall equivalence of the seismic behavior of precast and cast-in-situ structures. Moreover, two additional prototypes have been designed to investigate the seismic behavior of precast structures with roof elements placed side by side. The results of these further tests show that an effective horizontal diaphragm action can be activated even if the roof elements are not connected among them, and confirm the expected good seismic performance of these precast systems. Finally, the results of the experimental tests are compared with those obtained from nonlinear structural analyses. The good agreement between numerical and experimental results confirms the accuracy of the theoretical model and, with it, the results of the probabilistic investigation.     

A Five-Step Procedure for the Dimensioning of Viscous Dampers to Be Inserted in Building Structures

Viscous dampers have widely proved their effectiveness in mitigating the effects of the seismic action upon building structures. In view of the large impact that use of such dissipative devices is already having and would most likely have soon in earthquake engineering applications, this article presents a practical procedure for the seismic design of building structures equipped with viscous dampers, which aims at providing practical tools for an easy identification of the mechanical characteristics of the manufactured viscous dampers which allow to achieve target levels of performances. Selected numerical applications are developed with reference to simple, but yet relevant, cases.     

Development and Verification of a New Site Classification System and Site Coefficients for Regions of Shallow Bedrock in Korea

In this article, site response analyses for 124 sites collected in Korea were performed to evaluate earthquake ground motions in regions of shallow bedrock in Korea. Based on the results, a new two-parameter site classification system was developed for use in regions of shallow bedrock. The system incorporates depth to bedrock and mean V_S of soil above bedrock as parameters for site classification instead of V_S30. Soil sites were divided into seven site classes and the corresponding site coefficients were proposed for each site category. Some verification work demonstrates the superiority of the proposed system over the current seismic codes.     

Seismic Design of MRF-EBF Dual Systems with Vertical Links: EC8 vs Plastic Design

Despite the fact that Eccentrically Braced Frames with Vertical Links (VL-EBFs), also referred to as inverted Y-scheme, are codified in Eurocode 8, the issues related to their seismic response and design have not been widely investigated, so that design criteria commonly applied for Eccentrically Braced Frames with Horizontal Links (HL-EBFs) are commonly applied. However, the Theory of Plastic Mechanism Control (TPMC) has been recently extended to the case of VL-EBFs. The aims of this article, on one hand, are to provide a further validation of the recently proposed design procedure, based on TPMC, and, on the other hand, are to compare the seismic performance of dual systems composed by a moment-resisting part and VL-EBF part designed by means of TPMC with those occurring when Eurocode 8 design criteria are applied. The validation of the proposed design procedure is carried out by means of Incremental Dynamic Analyses (IDA). The main purpose of such analyses is the check of the fulfilment of the design goal of TPMC, i.e., the development of a pattern of yielding consistent with the collapse mechanism of global type. Such mechanism is universally recognized as the one leading to the highest energy dissipation capacity. In case of MRF-EBF dual systems, it is characterized by the yielding of all the links and all the beams at their ends. Conversely, all the columns and the diagonal braces remain in elastic range. Obviously, exception is made for the base sections of first story columns. In particular, two case studies are analyzed which are characterized by a different number of stories. Each building structure is designed according to both TPMC and Eurocode 8 provisions. The seismic response obtained is investigated by both push-over and IDA analyses. The attention is focused on the pattern of yielding obtained, the maximum interstory drift demand, the link plastic rotation demand and sharing of the seismic base shear between the moment-resisting part and the bracing part of the structural system. The results obtained point out improvement of the seismic response, compared to Eurocode 8 provisions, achieved by means of TPMC.