ANALYSIS,TESTING AND DESIGN OF STEEL ROOF DECK DIAPHRAGMS FOR DUCTILE EARTHQUAKE RESISTANCE

An experimental program was conducted to study the inelastic response of steel roof deck diaphragms for low-rise steel buildings subjected to seismic loading. Tests were performed on 3.6 m×6.1 m diaphragm specimens made of corrugated steel deck panels. The parameters examined were the thickness and configuration of the sheet steel panels, the type and spacing of the fasteners, the applied loading history and the influence of end lap joints. Diaphragms built with screwed side lap fasteners and nailed deck-to-frame connectors exhibited a pinched hysteretic behaviour, but could sustain large inelastic deformation cycles with limited strength degradation. This type of diaphragm construction could be designed to resist earthquake effects in the inelastic range. Higher shear resistance and less pinching was observed for systems that included welded with washer connections. However, their strength decreased rapidly after the peak load was reached, and hence, these systems should be designed for limited inelastic response. Deck systems with button punched side laps and frame welds without washers showed a brittle response and should be designed to remain elastic under severe earthquake motions. The inelastic demand was found to increase when the spacing of the fasteners was reduced. Specimens constructed with an internal overlap joint exhibited extensive warping of the cross section mainly due to the shorter panel length.     

SEISMIC DESIGN AND ANALYSIS OF A KNEE BRACED FRAME BUILDING

A five-storey steel frame incorporating dissipative knee elements is designed using the Eurocode 8 pushover analysis method. The non-linear analysis makes use of a novel knee element model capable of accurately simulating the bending and shear behaviour observed in full-scale tests. The performance of the structure is assessed using non-linear time-history analysis. This shows that the knee elements can be designed to yield under small earthquakes or early in a strong one (maximising their energy dissipation) while still being able to withstand a large event without collapse. Knee elements thus have the potential to give excellent seismic performance in steel framed structures. The time history analysis results are compared to those obtained with the three different pushover analysis methods (Eurocode 8, FEMA 356 and ATC 40). The FEMA 356 method, which includes a more accurate representation of the structure's significant post-yield stiffness, gave the closest agreement with the time history analyses, while the Eurocode 8 method gave rather conservative results and the ATC 40 method appears non-conservative for this type of structure.     

4. THE GADAMERIAN APPROACH TO THE RELATION BETWEEN EXPERIENCE AND LANGUAGE

Narrativism as a theory of historical depiction intuitively opens the question: what is left of reality when it is poured through the filter of language structures? And, extended a little bit further, questions arise: What is responsible for the final shape of a historical depiction? Is it experience or language? What is affecting what? Narrativism typically accuses language units of transforming experience in a specific way. However, even in asking these questions, the problem of the separation of experience from language and language from experience remains. In this article, I address this issue using Gadamer's hermeneutical frame. Wherever philosophical tradition insists on the separation of certain positions, Gadamer tries to show their ontological connections. For Gadamer, understanding is a basic ontological structure, within which both sides of a dialogue affect and constitute each other. In Gadamerian hermeneutical ontology, there is no “starting point” or first responsible position. In the understanding, dialogue has the permanently moving character of a play, where separate positions are erased. This Gadamerian view can also be applied to the question of language and experience and their mutual connection in depicting any experience via language. In Gadamer's example of the work of art, the original subject matter (Urbild) is articulated through its depiction. The subject matter dictates possible ways of depicting, which in turn dictate the final shape of depiction. In this article, I discuss Gadamer's term “articulation of the world,” by which he means a function of language. Articulation is simply a transformation of shapeless matter into a shape, and in our case it is a transformation of an experience into a language depiction. I show that the Gadamerian approach to language and experience can offer an interesting perspective on the issues discussed in reaction to narrativist philosophy of history.     

THE UNCONSCIOUS IN INDIVIDUALS AND SOCIETY: ON THE APPLICATION OF PSYCHOANALYTIC CATEGORIES IN HISTORIOGRAPHY

The long-held conviction of a mutually exclusive relationship between psychoanalysis, which allegedly proceeds purely in terms of individual psychology, and historical social science, which is interested primarily in the analysis of collectives, has significantly hindered dialogue between the disciplines. Norbert Elias's “figurational” sociology, which has been strongly influenced by psychoanalysis and group therapy, has the potential to indicate a way in which social science-oriented historical research might investigate the network of relations between individual and “collective” psychic processes without relying on artificial dichotomies. Elias's figurational theory, for its part, does not sufficiently take into account the question of a collective or social unconscious, so this article examines approaches that attempt to explore and conceptually define a supra-individual unconscious.     

London-Bahrain Archaeological Expedition excavations at Saar: 1993 season

During 1993, the London-Bahrain Archaeological Expedition conducted a fourth season of excavations at the early second millennium settlement of Saar, Bahrain. A lower level of the temple was cleared, and a range of buildings to its north-west discovered. A new street was found opposite the temple entrance, and several of the buildings along the main street were further investigated. Further environmental research included a new programme of micromorphology and the start of research into the fish remains.