Experimental Response

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Georgios Leonidopoulos - One of the best experts on this subject based on the ideXlab platform.

Luis San Andrés - One of the best experts on this subject based on the ideXlab platform.

R. Landolfo - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Response of top and seat angle semi-rigid steel frame connections
    Materials and Structures, 2000
    Co-Authors: L. Calado, G. Matteis, R. Landolfo
    Abstract:

    Dans cet article, on étudie le comportement structurel d’un type de liaisons poutre-poteau semi-rigides. La poutre et le poteau sont liés par des cornières. Les procédures de chargement que l’on a suivies incluent plusieurs cas de chargements monotones et cycliques. Pour déterminer le comportement de ces liaisons à la fatigue (petit nombre de cycles et grandes déformations plastiques), on a adopté plusieurs procédures de déplacements à amplitude constante. L’étude a été appliquée à trois types de poteaux. Comme on a considéré cinq liaisons différentes pour chaque type de poteau, un total de quinze liaisons ont été essayées. Les comportements étudiés ont été représentés sous forme de diagrammes moment—rotation, de l’énergie dissipée et de la dégradation de rigidité, et ont été comparés entre eux. Comme prévu, la déformation plastique a eu lieu surtout dans les cornières, lesquelles sont donc les éléments les plus importants de la liaison. La dimension de la section du poteau influence très peu le comportement histérétique de la liaison, lequel, d’autre part, dépend des déplacements précédemment appliqués. The current study is concerned with the structural Response of typical semi-rigid steel beam-to-column joints. In particular, the behaviour of bolted cleat angle connections is investigated under different loading conditions, both monotonic and cyclic loading being considered. Besides, aiming at assessing the susceptibility of the analysed connection typology to low-cycle fatigue, the latter has been referred to both constant and variable amplitude deformations. Therefore, 15 full-scale tests have been carried out by comparing the performance of specimens with reference to three different sizes of column member as well. Obtained results are provided in terms of moment-rotation relationship, dissipated energy and strength degradation per cycle. As expected, outcomes show that the main sources of inelastic deformation are located into cleat angles, which constitute the most influential component. As a consequence, the column size has a limited effect on the whole hysteretic Response of the joint, while results appear to be strongly dependent on the applied deformation history.

  • Experimental Response of top and seat angle semi-rigid steel frame connections
    Materials and Structures, 2000
    Co-Authors: L. Calado, G. Matteis, R. Landolfo
    Abstract:

    The current study is concerned with the structural Response of typical semi-rigid steel beam-to-column joints. In particular, the behaviour of bolted cleat angle connections is investigated under different loading conditions, both monotonic and cyclic loading being considered. Besides, aiming at assessing the susceptibility of the analysed connection typology to low-cycle fatigue, the latter has been referred to both constant and variable amplitude deformations. Therefore, 15 full-scale tests have been carried out by comparing the performance of specimens with reference to three different sizes of column member as well. Obtained results are provided in terms of moment-rotation relationship, dissipated energy and strength degradation per cycle. As expected, outcomes show that the main sources of inelastic deformation are located into cleat angles, which constitute the most influential component. As a consequence, the column size has a limited effect on the whole hysteretic Response of the joint, while results appear to be strongly dependent on the applied deformation history.

D Marriott - One of the best experts on this subject based on the ideXlab platform.

  • design modeling and Experimental Response of seismic resistant bridge piers with posttensioned dissipating connections
    Journal of Structural Engineering-asce, 2007
    Co-Authors: D Marriott, Alessandro Palermo, Stefano Pampanin
    Abstract:

    An increasing interest in the development of high-performance seismic resisting systems based on posttensioned, jointed ductile connections has been observed in the last decade. The extensive Experimental and numerical studies carried out under the PRESSS program developed efficient alternative solutions for seismic resisting frame or wall systems in precast concrete building construction, typically referred to as jointed ductile connections. Low structural damage and self-centering behavior, leading to negligible residual displacements after an earthquake event, were recognized to be the main features of such systems. Recently, the extension and application of similar technology and seismic design methodologies to bridge piers and systems have been proposed in the literature as a viable and promising alternative to traditional cast-in situ or precast construction. However, a broad acceptance of these solutions in the bridge design and construction industry has yet to be observed. Valid justifications can be found in the lack of official guidelines for design and construction detailing as well as in the general apparent complexity of the design procedure and analytical models presented by the scientific community. In this contribution, confirmations of the unique design flexibility, the ease of construction, and the high seismic performance of jointed ductile hybrid systems, combining recentering and dissipation capabilities, are presented. After a presentation of simple design methodologies and modeling aspects herein adopted to fully control the seismic Response of these systems, the Experimental results of quasistatic cyclic tests on five 1:3 scaled, bridge pier specimens are reported and discussed. Four alternative hybrid configurations are implemented by varying the ratio between the posttensioning steel and the internal mild steel as well as the initial posttensioning load. Lower levels of damage and negligible residual/permanent deformations are observed in the hybrid solutions when compared to the Experimental Response of the benchmark specimen, representing a typical monolithic (cast-in situ) ductile solution. In addition, the efficiency of the simple analytical procedure adopted for design and modeling is further validated.

Deborah A. Osborne - One of the best experts on this subject based on the ideXlab platform.

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