TORSIONAL EFFECTS IN THE PUSHOVER-BASED SEISMIC ANALYSIS OF BUILDINGS

The general trends of the inelastic behaviour of plan-asymmetric structures have been studied. Systems with structural elements in both orthogonal directions and bi-axial eccentricity were subjected to bi-directional excitation. Test examples include idealised single-storey and multi-storey models, and a three-storey building, for which test results are available. The response in terms of displacements was determined by nonlinear dynamic analyses. The main findings, limited to fairly regular and simple investigated buildings, are: (a) The amplification of displacements determined by elastic dynamic analysis can be used as a rough, and in the majority of cases conservative estimate in the inelastic range, (b) Any favourable torsional effect on the stiff side, which may arise from elastic analysis, may disappear in the inelastic range. These findings can be utilised in the approximate pushover-based seismic analysis of asymmetric buildings, e.g. in the N2 method. It is proposed that the results obtained by pushover analysis of a 3D structural model be combined with the results of a linear dynamic (spectral) analysis. The former results control the target displacements and the distribution of deformations along the height of the building, whereas the latter results define the torsional amplifications. The proposed approach is partly illustrated and evaluated by test examples.     

A NON-PARAMETRIC APPROACH TO ATTENUATION RELATIONS

Abstract

A non-parametric multidimensional regression method is proposed for the prediction of seismic ground motion parameters. The main features which distinguish the method from standard regression procedures are: (1) The relationship between the input and output variables is not selected a priori by a prediction law, (2) an arbitrary number of input variables Can be taken into account, provided that an appropriate data base exists, and (3) the computational procedure is very simple. The results can be easily updated when new information becomes available. The method has been applied for the derivation of attenuation relations by using a combination of databases compiled by other researchers. In the majority of the cases discussed in this paper, the method was used for the prediction of horizontal peak ground acceleration as a function of magnitude and distance. In some cases, ground conditions were also taken into account. Some results on the attenuation relations of peak ground velocity and displacement, as well as Arias intensity, are also presented.     

Liberation theology and the voice of the indigenous other in Guatemala

The legacy of the liberation theology in Guatemala is complex. Although it mobilized progressive Catholic forces at times, it has not overcome reactionary and conservative church elements. Most importantly, it has not proven entirely capable of rising above elitism, nor has it moved beyond paternalism toward Maya culture.     

Citizenship, accountability and community: the limits of the CSR agenda

While the issue of the role of the private sector in development is very much on the agenda of donors and governments, mainstream Corporate Social Responsibility (CSR) debates continue to neglect questions with regard to the accountability of companies to the communities in which they invest. Liberal notions of CSR place great emphasis on voluntary, partnership and market based approaches to tackling social and environmental problems and managing conflict. While the rise of voluntary standards and codes of conduct in the North and the growing popularity of various forms of 'civil regulation' has improved the responsiveness of corporations to social and environmental issues, there are doubts about their transferability or relevance in many southern settings. This is particularly so when viewed from the perspective of communities pursuing corporate accountability in the absence of donor, NGO or government pressure for company reform. It is in these 'majority world' settings that we encounter the limits of the liberal CSR agenda.
This article therefore explores the different tools that poorer communities have developed in order to construct mechanisms of corporate accountability. Recent work in India is drawn upon to ground the analysis, but reference is made to many other cases in different regions of the world and across a variety of sectors. It is suggested that many state-based, community-based and company-based factors determine the likely success of such initiatives. Power disparities and how to contest them emerge as key, however, and their neglect within mainstream CSR approaches undermines their ability to address issues of corporate accountability in situations characterized by sharp inequities in power. The emphasis here is on the process of promoting corporate accountability, and the relations of power that underpin these, rather than the achievement of more narrowly defined indicators of corporate performance.     

Corporate accountability in South Africa: the role of community mobilizing in environmental governance

Contrasting perspectives of international companies and civil society groups have divided recent debates about corporate responsibility in developing countries. The Corporate Social Responsibility discourse has been promoted by business lobbies, emphasizing the role of international companies in voluntarily contributing towards the solution of pressing social and environmental problems through partnerships with other stakeholders. The notion of corporate accountability has become the rallying point for sustainable development, demanding stricter regulation of corporate behaviour by national governments and the enactment of an international corporate accountability convention. This article assesses the promises and pitfalls of these two competing approaches to industries in South Africa. The article argues that a multi-level approach is necessary to the impact of CSR and corporate accountability initiatives. It concludes that CSR may improve environmental management systems and reduce corporate pollution levels whereas corporate accountability approaches may provide important incentives for companies to improve their environmental performance, assist in the development of national environmental governance frameworks guiding company-community interaction, and facilitate the enforcement of national legislation pertaining to corporate responsibility. However, both approaches fail to address the underlying, globallevel structural causes of conflicts between companies and stakeholders affected by their operations. These conflicts can only be reversed by fundamental changes in the global economy.     

Sustainable Water Management Policy: Lessons from Amsterdam

This article focuses on the identification of critical water policy instruments, and opportunities and barriers to transforming urban water use in a sustainable and efficient direction in Amsterdam (The Netherlands). The main lessons that can be inferred from past and current water policies and management practices in Amsterdam show (1) the relevance of common action for increasing the quality of or general control over water resources when shared interests of different actors using the same water resource are present; (2) that the effectiveness and applicability of water policy instruments are strongly conditional upon receiving the support of both water users and suppliers; (3) that the governance structure of water provision plays a crucial role in increasing the efficiency of water use.