Seismic Response of a Four-Story Miniature Building with Replaceable Plastic Hinges

To emphasize on linear and nonlinear seismic behavior of building systems in education, a four-story miniature moment-resisting frame steel building was designed, built, and tested in a shaking table at the Structures Laboratory of the Department of Civil Engineering at the University of Canterbury, New Zealand. A prominent feature of the building is the incorporation of elements designed to form plastic hinges that can be easily replaced after a test with minimum effort and at a very low cost. This model is mainly aimed at education in undergraduate and graduate structural dynamics/earthquake engineering courses and it has also been used to support research. This article describes in detail the main features of the building, its design, and discusses the response of the building to two input ground motions. Because the use of pushover analyses is becoming an industry standard, the some relevant results will be compared with those predicted by such kind of analyses. This article is written in very simple terms and is aimed at the undergraduate and graduate student, at educators in structural design and at structural engineers involved in seismic design of building structures. This article covers many aspects that are seldom highlighted in building behavior to earthquake excitation and that are not always covered in design codes or guidelines.     

The First ‘Urnfields’ in the Plains of the Danube and the Po

Journal of World Prehistory - Archaeological research is currently redefining how large-scale changes occurred in prehistoric times. In addition to the long-standing theoretical dichotomy between...     

Field work: A view from the third world

André Béteille and T. N. Madan, eds. Encounter and Experience. Honolulu: The University Press of Hawaii, 1975. viii + 225 pp. Bibliography. $8.00.     

Diversity and employment growth in Canada, 1971–2001: can diversification policies succeed?

In this paper, we explore the link between diversity in the local economy, the process of diversification and employment growth. To do so, we first examine diversification trends between 1971 and 2001 across 382 Canadian areas (urban and rural). We then examine whether or not the more diversified areas display faster employment growth. Over some periods and for some types of area they do, but over other periods they do not. Furthermore, there is no clear link between the process of diversification and growth. Also, proximity to a large diversified economic unit (metropolitan areas) tends to be associated with growth; thus, it is not only the local characteristics of regions that determine their growth levels. Our evidence suggests that economies associated with diversity can occur concurrently with economies associated with specialisation. In the light of these complex relationships, we conclude that diversification policies are difficult to justify on the grounds of employment growth and would in any case be difficult to implement successfully due to the overall inertia observed in diversity levels.     

Minimum Thrust of Rounded Cross Vaults

This study analyzes the static behavior of the rounded cross vaults based on the limit analysis approach developed for masonry structures and adopts a rigid no-tension constitutive model with no sliding. The kinematic theorem of the limit analysis with a compatible tridimensional mechanism is applied on these structures with the aim of evaluating the minimum thrust. In this way it was possible to build some abaci in which the ratio between the minimum thrust and the weight is plotted versus the geometrical characteristics of the vaults. Finally, the proposed abaci are used to calculate the thrust of the main vault of the Diocletian Baths in Rome.     

Le classement des villes dans l'économie du savoir : une analyse intégrée des régions urbaines canadiennes et américaines

Des comparaisons entre villes canadiennes et américaines doivent se faire avec prudence. L'obstacle principal reste la comparabilité des séries statistiques. Nous proposons une analyse intégrée de l'ensemble des 90 régions métropolitaines nord-américaines de 500 000 habitants et plus, dont neuf canadiennes. Suite à une revue de divers classements, nous situons les 90 régions urbaines sur sept indicateurs, dont des variables portant sur le capital humain et le secteur tertiaire intensif en savoir, suivi d'une analyse de corrélation mettant en relation les indicateurs pour trois univers de villes (sans et avec des villes canadiennes). Nos résultats confirment le bon positionnement sur plusieurs indicateurs de métropoles américaines comme San Francisco-Silicon Valley et Boston, mais aussi de villes comme Raleigh (research triangle) et Austin, connues pour leurs activités de recherche. Les villes canadiennes se classent plutôt bien, notamment les cinq plus grandes. Cependant, c'est moins vrai pour des villes comme Winnipeg ou Hamilton. L'analyse de corrélation fait ressortir la relation positive entre dotation en capital humain et poids du tertiaire intensif en savoir, mais ne révèle aucune relation significative avec l'indicateur de qualité de vie.