Abstract
Six full-scale steel-concrete composite substructures with full and partial shear connection representing half bay within a moment-resisting frame were built and tested both in a, quasi-static cyclic and pseudo-dynamic regime. The specimens embodied two composite beams with full shear connection and four companion beams with two different degrees of partial shear connection all with exterior rigid joints.
Tests were conducted in a set-up purposely designed to impose to specimens reversed horizontal displacements in a low-cycle high amplitude regime. The characteristics of the test apparatus ready for different structural members subjected to horizontal loading are illustrated. Moreover, the seismic performances of the specimens in terms of yielding and of maximum strength capacity as well as of displacement ductility are assessed. Finally, the accuracy of a European code calibrated upon monotonic loading is provided and other local characteristics of the composite substructure behaviour with low partial shear connection are commented upon.
Résumé
Six poutres mixtes béton-acier à échelle réelle ayant des connections au cisaillement complètes et partielles, représentant une démi-travée, dans le cadre d’une structure qui résiste aux moments, ont été construites et testées aussi bien dans un régime cyclique quasi-statique que dans un régime pseudo-dynamique. Les spécimens sont constitués de deux poutres composites ayant des connections au cisaillement, complètes et quatre poutres, de même dimension ayant deux différents degrés de connections au cisaillement partielles, toutes ayant des jointures extérieures et rigides.
Les essais ont été faits selon une configuration étudiée intentionnellement pour imposer aux spécimens des déplacements horizontaux et opposés dans un régime à bas cycle et à haute amplitude. On expose les caractéristiques de l’appareillage destiné aux essais des différents membres structuraux soumis aux charges horizontales. En outre, les performances sismiques des spécimens ont été évaluées aussi bien du point de vue de l’éervement, et de la capacité maximale de résistance que de la ductilité du déplacement. Enfin, une comparaison d’un code européen calibré sur une charge monotone est vérifiée et d’autres caractéristiques locales de la conduite de la substructure mixte ayant un degré bas des connections au cisaillement, sont commentées.
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Bursi, O.S., Gramola, G. Behaviour of composite substructures with full and partial shear connection under quasi-static cyclic and pseudo-dynamic displacements. Mat. Struct. 33, 154–163 (2000). https://doi.org/10.1007/BF02479409
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DOI: https://doi.org/10.1007/BF02479409