Documents disponibles écrits par cet auteur

Effect of friction on unbonded elastomeric bearings / Kelly, James M. in Journal of engineering mechanics, Vol. 135 N° 9 (Septembre 2009) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 135 N° 9 (Septembre 2009) . - pp. 953-960 Titre : Effect of friction on unbonded elastomeric bearings Type de document : texte imprimé Auteurs : Kelly, James M., Auteur ; Dimitrios Konstantinidis, Auteur Article en page(s) : pp. 953-960 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Load  bearing  capacity  Bridges  Friction  Seismic  effects  Stiffness  Earthquakes. Résumé : This paper describes a theoretical analysis of a type of thermal expansion bridge bearing which could be used as a lightweight low-cost elastomeric seismic isolator for application to housing, schools, and other public buildings in earthquake-prone areas of the developing world. The analysis covers the effect of the frictional resistance of the supports on the vertical stiffness of this type of isolator. The most important aspect of these bearings is that they do not have end plates, which reduces their weight, but also means that they are not bonded to the upper and lower support surfaces and are held in place only by friction. This at first sight might seem to be a deficiency of this design, but it has the advantage that it eliminates the presence of tensile stresses in the bearings. It is these tensile stresses and the bonding requirements that arise from them that lead to the high costs of conventional isolation bearings. A theoretical analysis of the response of these bearings to vertical load shows that slip between the unbonded surfaces and rigid supports above and below can have a significant influence on the vertical stiffness and the internal pressure distribution. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...] [article] Effect of friction on unbonded elastomeric bearings [texte imprimé] / Kelly, James M., Auteur ; Dimitrios Konstantinidis, Auteur . - pp. 953-960. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 135 N° 9 (Septembre 2009) . - pp. 953-960 Mots-clés : Load  bearing  capacity  Bridges  Friction  Seismic  effects  Stiffness  Earthquakes. Résumé : This paper describes a theoretical analysis of a type of thermal expansion bridge bearing which could be used as a lightweight low-cost elastomeric seismic isolator for application to housing, schools, and other public buildings in earthquake-prone areas of the developing world. The analysis covers the effect of the frictional resistance of the supports on the vertical stiffness of this type of isolator. The most important aspect of these bearings is that they do not have end plates, which reduces their weight, but also means that they are not bonded to the upper and lower support surfaces and are held in place only by friction. This at first sight might seem to be a deficiency of this design, but it has the advantage that it eliminates the presence of tensile stresses in the bearings. It is these tensile stresses and the bonding requirements that arise from them that lead to the high costs of conventional isolation bearings. A theoretical analysis of the response of these bearings to vertical load shows that slip between the unbonded surfaces and rigid supports above and below can have a significant influence on the vertical stiffness and the internal pressure distribution. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JENMDT&smode=strres [...]

Experimental and analytical studies on the response of freestanding laboratory equipment to earthquake shaking / Dimitrios Konstantinidis in Earthquake engineering structural dynamics, Vol. 38 N° 6 (Mai 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 6 (Mai 2009) . - pp. 827-848 Titre : Experimental and analytical studies on the response of freestanding laboratory equipment to earthquake shaking Type de document : texte imprimé Auteurs : Dimitrios Konstantinidis, Auteur ; Nicos Makris, Auteur Article en page(s) : pp. 827-848 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : laboratory  equipment;  non-structural  components;  shake  table  experiments;  rocking;  sliding;  PBEE;  fragility Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents results of a comprehensive experimental program on the seismic response of full-scale freestanding laboratory equipment. First, quasi-static experiments are conducted to examine the mechanical behavior of the contact interface between the laboratory equipment and floors. Based on the experimental results, the response analysis that follows adopts two idealized contact friction models: the elastoplastic model and the classical Coulomb friction model. Subsequently, the paper presents shake table test results of full-scale freestanding equipment subjected to ground and floor motions of hazard levels with corresponding displacements that can be accommodated by the shake table at the UC Berkeley Earthquake Engineering Research Center. For the equipment tested, although some rocking is observed, sliding is the predominant mode of response, with sliding displacements reaching up to 60 cm. Numerical simulations with the proposed models are performed. Finally, the paper identifies a physically motivated intensity measure and the associated engineering demand parameter with the help of dimensional analysis and presents ready-to-use fragility curves. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121559955/abstract [article] Experimental and analytical studies on the response of freestanding laboratory equipment to earthquake shaking [texte imprimé] / Dimitrios Konstantinidis, Auteur ; Nicos Makris, Auteur . - pp. 827-848. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 6 (Mai 2009) . - pp. 827-848 Mots-clés : laboratory  equipment;  non-structural  components;  shake  table  experiments;  rocking;  sliding;  PBEE;  fragility Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents results of a comprehensive experimental program on the seismic response of full-scale freestanding laboratory equipment. First, quasi-static experiments are conducted to examine the mechanical behavior of the contact interface between the laboratory equipment and floors. Based on the experimental results, the response analysis that follows adopts two idealized contact friction models: the elastoplastic model and the classical Coulomb friction model. Subsequently, the paper presents shake table test results of full-scale freestanding equipment subjected to ground and floor motions of hazard levels with corresponding displacements that can be accommodated by the shake table at the UC Berkeley Earthquake Engineering Research Center. For the equipment tested, although some rocking is observed, sliding is the predominant mode of response, with sliding displacements reaching up to 60 cm. Numerical simulations with the proposed models are performed. Finally, the paper identifies a physically motivated intensity measure and the associated engineering demand parameter with the help of dimensional analysis and presents ready-to-use fragility curves. ISSN : 0098-8847 En ligne : http://www3.interscience.wiley.com/journal/121559955/abstract