Abstract
Composite beams require an adequate connection system. This paper describes composite concrete-timber beams with a bonded connection system employing prestressed steel connectors. The connection is obtained by means of threaded steel bars inserted into the holes of timber and prestressed by a normal force. The connectors are able to transmit bond stresses between the two materials. This type of connection may be considered as rigid in the case of service loads. Experimental tests involving a composite concrete-timber beam and connection specimens were carried out. The test on the composite beam describes the bending behaviour up to failure; the connection specimens are used to evaluate the influence of age on the behaviour of the bond stress system utilised.
Résumé
Les poutres composites nécessitent un système de connexion adapté. Cet article décrit des poutres composites béton-bois utilisant des connecteurs en acier précontraints. La connexion est obtenue grâce à l'insertion des armatures en acier filetées dans les trous des éléments en bois après avoir été précontraintes par une force normale. Le système de connexion à frottement est capable de transmettre des forces de contacts entre les deux matériaux. Dans ce cas, la connexion est rigide jusqu'à des valeurs de charge en service courantes. L'analyse expérimentale effectuée sur un prototype de poutre composite ainsi que sur quelques échantillons avec connexion à frottement, a permis de vérifier le comportement en flexion de la poutre jusqu'à la rupture, ainsi que l'influence de l'âge sur le système de connexion utilisé.
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Capozucca, R. Bond stress system of composite concrete—timber beams. Mat. Struct. 31, 634–640 (1998). https://doi.org/10.1007/BF02480615
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DOI: https://doi.org/10.1007/BF02480615