Experimental investigation of multi-material aluminum-to-steel and GFRP-to-steel bonded and bolted/bonded connections

Abstract : Through an experimental study, this paper describes the behavior of single-lap bonded, bolted and bolted/bonded connections for configurations with minimum geometric parameters proposed in design references. Two types of multi-material connections are considered: Glass Fiber Reinforced Polymer (GFRP)-to-steel and aluminum-to-steel. At first, the behavior of multi-material bonded connection using methacrylate and epoxy adhesives is evaluated. Then experimental results of bolted connections are presented. Finally, the contribution of adhesive in GFRP-to-steel and aluminum-to-steel bolted connections is investigated. Test results show that on single-lap simply bonded joints, failures mostly occur at the substrate to adhesive interface. Sanding the GFRP plate was found to improve the connection strength. Despite their lower elastic modulus, methacrylate adhesives with larger elongation provides better strength due to their high resistance in peeling. For bolted/bonded joints, the adhesive was found to improve the elastic behavior and the strength of GFRP-steel joints while its effect for aluminum-steel joints was not apparent due to reduce bonded surface and the high strength performance of the bolted plates

Effect of geometric parameters on the behavior of bolted GFRP pultruded plates

Abstract : This paper presents the effect of geometric parameters on the behavior of bolted GFRP pultruded plates for civil engineering applications. After a literature review, results of an experimental analysis investigating the behavior of GFRP-to-steel single-lap bolted connections are presented. Then, a finite element analysis validated by experimental data is used to evaluate the effects of the end-distance, side-distance, gage, pitch and plate properties on the strength and failure mode of the connection. A critical examination of geometric recommendations proposed in design references is presented. Bearing failure caused by contact of the bolt on the GFRP plate is usually defined as the preferred failure mode. With highly orthotropic plate, this type of failure was found to be less likely to occur when loading is applied in the pultruded direction. The investigation showed that the minimum end-distance and pitch-distance recommended by design references usually produce a connection with the maximum capacity. However, it was found that the minimum side-distance recommended by these references does not necessarily lead to the maximum capacity for one-bolt and for two-bolt in a column connections

Effect of geometrical parameters of aluminum-to-steel bolted connections

Abstract : Through experimental and numerical studies, this research work aims to provide directions on the optimal geometric configuration for single-lap and double-lap bolted connection between aluminum alloy 6061-T6 and steel. From experimental test results, the effects of different geometric parameters on the joint strength were discussed. These parameters include the end-distance, the side-distance, the pitch-distance, the plate thickness and the joint eccentricity. Then, the experimental results were compared to predicted results using design references and geometric recommendations proposed by design references were critically examined. The experimental study was complemented by finite element (FE) analysis to extend the study to a larger range of parameters. In addition to the analysis of the geometric parameters listed above, the effects of the gage-distance on the joint strength were studied in the FE analysis. The experimental and finite element results show that a careful selection of geometric parameters can result in the high improvement of the connection strength and failure mode. Limiting the side-distance to the minimum recommended value was found to limit the strength of a connection with two bolts in a column to that of the one-bolt connection. In most cases, bearing was found to govern the strength of the connections. The calculated bearing strengths were found to underestimate significantly the connection strength. Based on these analyses, maximum geometric parameters beyond which there is no further increase of the joint capacity were evaluated and optimum geometric parameters were proposed

La mise en scène de l'imaginaire national et historique du Québec francophone dans la télésérie "Les Filles de Caleb"

Tableau d’honneur de la Faculté des études supérieures et postdoctorales, 2004-2005Québec Université Laval, Bibliothèque 201

Être et agir, ou la voi(e/x) de l’héroïne : réflexion sur l’identité d’Émilie, fille de Caleb Bordeleau

Cet article se penche sur le personnage d’Émilie Bordeleau, figure principale de la très populaire télésérie Les Filles de Caleb diffusée au Québec entre octobre 1990 et février 1991. Il présente sommairement les modèles usuels d’héroïsme au féminin apparus avec l’émergence des sociétés bourgeoises, puis, en pêchant dans le contenu de la télésérie, montre comment et pourquoi le personnage d’Émilie était à la fois fidèle à ces modèles et en rupture avec eux, c’est-à-dire profondément moderne sous une enveloppe traditionnelle. Finalement, l’article suggère une lecture à deux niveaux de ce personnage en liaison avec le contexte sociopolitique de diffusion de la télésérie marqué par l’ébullition nationaliste post-Meech du Québec français.This article examines the character Émilie Bordeleau, a lead character in the highly popular television series Les Filles de Caleb, broadcast in Québec between October 1990 and January 1991. The article gives a summary presentation of the usual models of female heroism that have appeared with the emergence of bourgeois societies, and then draws on the television series’ content to show how and why the character of Émilie was both true to these models and at odds with them; in other words profoundly modern beneath a traditional outer shell. Finally, the article suggests a reading of this character on two levels, in relation to the sociopolitical context of the broadcasting of the television series, marked by the post-Meech turmoil of francophone Québec

Souvenir, mémoire et imaginaire de la francité dans Les Filles de Caleb

La télésérie Les Filles de Caleb, œuvre de fiction inspirée de la vie de personnes réelles, a proposé aux Québécois une représentation d’eux-mêmes qui misait sur une panoplie de stéréotypes bien établis dans leur imaginaire et à laquelle ils ont conféré une valeur d’authenticité à la fois historique et nationale. Par une analyse de son discours sur la francité, notion entendue comme patrimoine culturel hérité de France ou tenu pour tel dans la mémoire, cet article montre comment la télésérie s’est servie de ces stéréotypes pour donner à son récit une valeur ajoutée sur le plan identitaire. La réaction populaire suscitée par Les Filles de Caleb témoigne avec éloquence de la réussite de l’entreprise, tout autant qu’elle nous permet de pénétrer à l’intérieur du mécanisme de construction de la réalité à partir du contenu d’une fiction.The mini-series Les Filles de Caleb, a work of fiction inspired by actual persons, provided Quebecers with a self-representation moulded out of a variety of stereotypes that were entrenched in Quebec's national imagination and were viewed as historically authentic. By analysing the discourse of francité, a notion which refers to Quebec's French cultural legacy or to aspects of Quebec's cultural heritage that are assumed to have been derived from France, this article shows how the mini-series used stereotypes to lend authenticity to its narrative in the realm of identity. The success of Les Filles de Caleb also illustrates the extent to which reality can be constructed out of fiction