Documents disponibles écrits par cet auteur

Effect of fabric webs on the static response of spindle-shaped tensairity columns / Thomas E. Wever in Journal of structural engineering, Vol. 136 N° 4 (Avril 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 4 (Avril 2010) . - pp. 410-418 Titre : Effect of fabric webs on the static response of spindle-shaped tensairity columns Type de document : texte imprimé Auteurs : Thomas E. Wever, Auteur ; Theofanis S. Plagianakos, Auteur ; Rolf H. Luchsinger, Auteur Année de publication : 2010 Article en page(s) : pp. 410-418 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Tensairity  Lightweight  structures  Inflatable  structures  Fabrics  Axial  compression  Full-scale  tests  Webs Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Tensairity is a lightweight structural concept comprising struts and cables stabilized by a textile membrane which is inflated by low pressurized air. This paper addresses the effect of fabric webs inside the membrane hull on the static response of spindle-shaped Tensairity columns to axial compression. Two full-scale spindle-shaped columns, one without and one with webs, were fabricated and tested. The columns were subjected to axial compressive loading for various levels of internal air pressure to quantify its effect on the global structural response. It was found that the stiffness and the load bearing capacity for both columns increased with increasing air pressure. The experimental results also revealed the benefits of including fabric webs in the spindle configuration in terms of axial stiffness and buckling load. Comparisons with an analytical solution and finite-element predictions showed good correlation for the axial stiffness in the case without webs. For the case with web deviations between predicted and experimental results indicated that structural detailing and imperfections in the manufacturing process strongly influence the performance of Tensairity columns with internal webs. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i4/p410_s1?isAuthorized=no [article] Effect of fabric webs on the static response of spindle-shaped tensairity columns [texte imprimé] / Thomas E. Wever, Auteur ; Theofanis S. Plagianakos, Auteur ; Rolf H. Luchsinger, Auteur . - 2010 . - pp. 410-418. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 4 (Avril 2010) . - pp. 410-418 Mots-clés : Tensairity  Lightweight  structures  Inflatable  structures  Fabrics  Axial  compression  Full-scale  tests  Webs Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Tensairity is a lightweight structural concept comprising struts and cables stabilized by a textile membrane which is inflated by low pressurized air. This paper addresses the effect of fabric webs inside the membrane hull on the static response of spindle-shaped Tensairity columns to axial compression. Two full-scale spindle-shaped columns, one without and one with webs, were fabricated and tested. The columns were subjected to axial compressive loading for various levels of internal air pressure to quantify its effect on the global structural response. It was found that the stiffness and the load bearing capacity for both columns increased with increasing air pressure. The experimental results also revealed the benefits of including fabric webs in the spindle configuration in terms of axial stiffness and buckling load. Comparisons with an analytical solution and finite-element predictions showed good correlation for the axial stiffness in the case without webs. For the case with web deviations between predicted and experimental results indicated that structural detailing and imperfections in the manufacturing process strongly influence the performance of Tensairity columns with internal webs. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i4/p410_s1?isAuthorized=no

Structural behavior of symmetric spindle-shaped tensairity girders / Rolf H. Luchsinger in Journal of structural engineering, Vol. 139 N° 2 (Février 2013) 

Public ISBD [article]  in Journal of structural engineering > Vol. 139 N° 2 (Février 2013) . - pp. 169–179 Titre : Structural behavior of symmetric spindle-shaped tensairity girders Type de document : texte imprimé Auteurs : Rolf H. Luchsinger, Auteur ; Cédric Galliot, Auteur Année de publication : 2013 Article en page(s) : pp. 169–179 Note générale : structural engineering Langues : Anglais (eng) Mots-clés : inflatable  structures;  fabrics;  bending;  load  factors;  full-scale  tests;  finite  element  method;  girders;  structural  behavior Résumé : The load-bearing behavior of a symmetric spindle-shaped Tensairity girder with 5-m span and thin chords is studied experimentally, numerically, and analytically. The influence of the air pressure on the load-deflection behavior is investigated for homogeneous distributed load, asymmetric distributed load, and central local load. An m-shaped deflection with two maxima at about one- and three-quarter of the span was obtained for homogeneous distributed loads whose distribution is not linearly dependent on the applied load. The slope of the load-deflection curve as well as the maximal load increases with increasing air pressure, demonstrating the stabilizing role of the inflated hull. An analytical model based on two beams coupled by an elastic foundation with air pressure-dependent properties is presented for the homogeneous distributed load case, and simple predictions for the average displacement and the maximal load are given. The model reveals the subtle interplay between the chords and the inflated hull leading to the peculiar displacement distribution of the system. Finite-element analysis shows the limiting influence of the low fabric shear modulus on the stiffness and load-bearing capacity of the Tensairity girder for local and asymmetric distributed load. The investigated spindle-shaped Tensairity girder is optimal for homogeneous distributed loads, where a live load to dead load ratio of more than 50 has been achieved. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000619 [article] Structural behavior of symmetric spindle-shaped tensairity girders [texte imprimé] / Rolf H. Luchsinger, Auteur ; Cédric Galliot, Auteur . - 2013 . - pp. 169–179. structural engineering Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 2 (Février 2013) . - pp. 169–179 Mots-clés : inflatable  structures;  fabrics;  bending;  load  factors;  full-scale  tests;  finite  element  method;  girders;  structural  behavior Résumé : The load-bearing behavior of a symmetric spindle-shaped Tensairity girder with 5-m span and thin chords is studied experimentally, numerically, and analytically. The influence of the air pressure on the load-deflection behavior is investigated for homogeneous distributed load, asymmetric distributed load, and central local load. An m-shaped deflection with two maxima at about one- and three-quarter of the span was obtained for homogeneous distributed loads whose distribution is not linearly dependent on the applied load. The slope of the load-deflection curve as well as the maximal load increases with increasing air pressure, demonstrating the stabilizing role of the inflated hull. An analytical model based on two beams coupled by an elastic foundation with air pressure-dependent properties is presented for the homogeneous distributed load case, and simple predictions for the average displacement and the maximal load are given. The model reveals the subtle interplay between the chords and the inflated hull leading to the peculiar displacement distribution of the system. Finite-element analysis shows the limiting influence of the low fabric shear modulus on the stiffness and load-bearing capacity of the Tensairity girder for local and asymmetric distributed load. The investigated spindle-shaped Tensairity girder is optimal for homogeneous distributed loads, where a live load to dead load ratio of more than 50 has been achieved. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000619