Search results

The purpose of this paper is to present a new modification of the multimodal pushover method, named the target acceleration method. The target acceleration is the minimum acceleration of the base that leads to the ultimate limit state of the structure, i.e., the lowest seismic resistance.

A nonlinear numerical model is used to determine the target acceleration, which is achieved using the iterative procedure according to the envelope principle. Validation of the target acceleration method was conducted on the basis of the results obtained by incremental dynamic analysis.

The influence of higher modes is highly significant. The general failure vector corresponding to the target acceleration differs from the first load vector and the form of the load with uniform acceleration according to the height of structure, as contained in the European Standard EN 1998-1. Comparison between the target acceleration, including the equivalent structural damping, and the failure peak ground acceleration obtained from the dynamic response of the structure exhibits notably good agreement. This result implies that the equivalent structural damping as calculated according to the formulation presented in this paper should be greater than that suggested in the literature.

The originally developed procedure named multimodal pushover target acceleration method can reasonably estimate the minimum acceleration of the base that leads to the ultimate limit state of the structure, and consequently provides a reliable tool for the assessment of the lowest seismic resistance.

The purpose of this paper is to focus on Sarajevo, the capital of Bosnia and Herzegovina, giving a general overview of its urban context through five historical periods, as part of a research study on its modernist architectural heritage.

Designed to mimic the theatrical process which unfolds through acts and intervals, the paper combines literary, architectural, journalistic and historical sources, to sketch the key periods which characterise the city’s urban morphology.

The sequence of acts and intervals points to the dramatic historic inter-change of continuities and ruptures, in which the ruptures have often been less studied and understood. This explains the frequent conceptualising of Sarajevo through East–West binary, which synthesises it as a provincial capital from Ottoman and later Habsburg rule, a regional centre within two Yugoslav states and a capital city of a young state of Bosnia and Herzegovina. This highlights the need to study the ruptures as clues to the flow of continuities, in which the care and after care for built environment provide a field of evidence and possibilities for diverse perspectives of examination.

Corroborated by secondary sources, the paper examines the accounts of urban heritage destruction in the 1990s war, as recorded by a writer, an architect and a journalist, and outlines a pattern of unbroken inter-relations between urban and architectural space (tangible) and sense and identity of place (intangible).

This discourse is relevant to the current situation where the city of Sarajevo expands again, in the complexity of a post-conflict society.

Challenged by the political divisions and the laissez-faire economy, the public mood and interest is under-represented and has many conflicting voices.

Inspired by Italo Calvino’s Invisible Cities and the accounts from the siege of Sarajevo in the 1990s, this conceptual paper contributes to the formulation of a cross-disciplinary discursive prism through which the fragments of the city and its periods come together or apart, adding, subtracting and changing layers of meaning of the physical space.