Bending of composite stiffened hypar shell roofs under point load / Sarmila Sahoo in Journal of engineering mechanics, Vol. 134 n°6 (Juin 2008)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 134 n°6 (Juin 2008) . - pp. 441-454 Titre : Bending of composite stiffened hypar shell roofs under point load Type de document : texte imprimé Auteurs : Sarmila Sahoo, Auteur ; Dipankar Chakravorty, Auteur Année de publication : 2008 Article en page(s) : pp. 441-454 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Shells Composite materials Finite element method Stiffness Static structural analysis Concentrated loads Bending Roofs Résumé : The present paper applies a combination of an eight noded shell element with a three noded beam element, both curved and isoparametric to solve a bending problem of a composite stiffened hypar shell subjected to a concentrated load. Benchmark problems are solved to validate the suitability of the approach and a wide spectrum of stiffened hypar shell problems are solved by varying the lamination and curvature of simply supported and clamped shell surfaces. Different positions of stiffeners, both in plan and section, are considered together with variation of stiffener depth. Both static deflections and force/moment resultants are examined thoroughly. The performances of the different shell options are studied by arranging them rankwise and through a typical relative performance matrix, which will enable a designer to make a rational choice between a number of options. ISSN : 0733-9399 En ligne : http://cedb.asce.org/cgi/WWWdisplay.cgi?164542 [article] Bending of composite stiffened hypar shell roofs under point load [texte imprimé] / Sarmila Sahoo, Auteur ; Dipankar Chakravorty, Auteur . - 2008 . - pp. 441-454. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°6 (Juin 2008) . - pp. 441-454 Mots-clés : Shells Composite materials Finite element method Stiffness Static structural analysis Concentrated loads Bending Roofs Résumé : The present paper applies a combination of an eight noded shell element with a three noded beam element, both curved and isoparametric to solve a bending problem of a composite stiffened hypar shell subjected to a concentrated load. Benchmark problems are solved to validate the suitability of the approach and a wide spectrum of stiffened hypar shell problems are solved by varying the lamination and curvature of simply supported and clamped shell surfaces. Different positions of stiffeners, both in plan and section, are considered together with variation of stiffener depth. Both static deflections and force/moment resultants are examined thoroughly. The performances of the different shell options are studied by arranging them rankwise and through a typical relative performance matrix, which will enable a designer to make a rational choice between a number of options. ISSN : 0733-9399 En ligne : http://cedb.asce.org/cgi/WWWdisplay.cgi?164542

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Bending of delaminated composite conoidal shells under uniformly distributed load / Suman Kumari in Journal of engineering mechanics, Vol. 137 N° 10 (Octobre 2011)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 137 N° 10 (Octobre 2011) . - pp.660-668 Titre : Bending of delaminated composite conoidal shells under uniformly distributed load Type de document : texte imprimé Auteurs : Suman Kumari, Auteur ; Dipankar Chakravorty, Auteur Année de publication : 2012 Article en page(s) : pp.660-668 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Bending Composite materials Delamination Finite-element method Static structural analysis Shells Roofs Résumé : Conoidal shells are very popular roofing units owing to their aesthetic elegance and stiffness. Many parts of the globe, which were earlier assumed to be seismologically stable, are now being considered as earthquake prone. Hence the necessity to build light structures using composites has become very important. In this paper an eight-noded isoparametric shell element is applied for analyzing the bending behavior of delaminated composite conoidal shells under a uniformly distributed load with different practical boundary conditions. To ensure compatibility of deformation and equilibrium of forces and moments at the delamination crack front, a multipoint constraint algorithm is incorporated, which leads to an unsymmetrical stiffness matrix. This formulation is validated through the solution of benchmark problems. Lamination, curvature, and extent of delamination area are varied to compare the performances of delaminated conoidal shells against those with no damage. The results are carefully observed, and a set of conclusions is presented at the end of the paper. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i10/p660_s1?isAuthorized=no [article] Bending of delaminated composite conoidal shells under uniformly distributed load [texte imprimé] / Suman Kumari, Auteur ; Dipankar Chakravorty, Auteur . - 2012 . - pp.660-668. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 10 (Octobre 2011) . - pp.660-668 Mots-clés : Bending Composite materials Delamination Finite-element method Static structural analysis Shells Roofs Résumé : Conoidal shells are very popular roofing units owing to their aesthetic elegance and stiffness. Many parts of the globe, which were earlier assumed to be seismologically stable, are now being considered as earthquake prone. Hence the necessity to build light structures using composites has become very important. In this paper an eight-noded isoparametric shell element is applied for analyzing the bending behavior of delaminated composite conoidal shells under a uniformly distributed load with different practical boundary conditions. To ensure compatibility of deformation and equilibrium of forces and moments at the delamination crack front, a multipoint constraint algorithm is incorporated, which leads to an unsymmetrical stiffness matrix. This formulation is validated through the solution of benchmark problems. Lamination, curvature, and extent of delamination area are varied to compare the performances of delaminated conoidal shells against those with no damage. The results are carefully observed, and a set of conclusions is presented at the end of the paper. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i10/p660_s1?isAuthorized=no

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