DAMAGE AND DUCTILITY DEMAND SPECTRA ASSESSMENT OF HYSTERETIC DEGRADING SYSTEMS SUBJECT TO STOCHASTIC SEISMIC LOADS

Damage phenomena observed in structures subject to intense seismic events are the result of stiffness and strength degradation. This paper studies the damage assessment of hysteretic degrading structures described by means of the Bouc-Wen model, modified to represent the mechanical degradation induced by severe earthquakes. In order to consider randomness of seismic action, the analysis is performed by adopting a stochastic approach and the Park and Ang damage functional is also evaluated in stochastic way. A parametric analysis is carried out with the aim to analyse the effect of mechanical characteristics and measure parameters of earthquake intensity on seismic response and damage level. Damage spectra are finally obtained and they are used to develop, on the basis of the Performance Based Seismic Design, ductility demand spectra.     

Archiving anthropology in Portugal

This article examines some of the issues surrounding archiving in anthropology. It provides an account of archiving in the Portuguese context and seeks to problematize anthropology archives, contributing to the as yet timid debate over this question in the field. There are various ways of recording ethnographies and saving the ensuing records. Anthropologists often reflect on their archives, but rarely make these reflections public. Nor do we know much about what anthropologists in general plan to do with their fieldnotes, diaries, images, maps, drawings, audio and video recordings and objects, once a specific research project is complete. How do anthropologists store their data? What should be done with these materials? What stories can they tell? Will the ethnographic materials produced in the present be considered historical archives in the future?