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Elastic solutions for eccentrically loaded, slender, rectangular spandrel beams / Bulent Mercan in Journal of structural engineering, Vol. 138 N° 7 (Juillet 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 7 (Juillet 2012) . - pp. 911–921 Titre : Elastic solutions for eccentrically loaded, slender, rectangular spandrel beams Type de document : texte imprimé Auteurs : Bulent Mercan, Auteur ; Arturo E. Schultz, Auteur ; Stolarski, Henry K., Auteur Année de publication : 2012 Article en page(s) : pp. 911–921 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Precast  concrete  Prestressed  concrete  Lateral  displacement  Eccentric  loads  Analytical  techniques  Numerical  analysis Résumé : Spandrel beams in precast concrete buildings are widely used to support double-tee deck beams, particularly in parking garages. Spandrel beams of deep cross-sections, resisting eccentric loads from double-tee beams, can be susceptible to excessive lateral deformations and serviceability failures before reaching their strength limits. However, closed-form solutions for estimating lateral deflections in such members are not available in the technical literature. In this paper, approximate analytical solutions for the deflection of beams with thin rectangular sections are derived from second-order elastic analysis, and they are proposed for use in estimating maximum lateral deflections in spandrel beams under eccentric and uniformly distributed loads. Continuous lateral support is provided at the elevation of the floor deck to the spandrel beams. Thus, two cases are considered: one for laterally restrained beams under typical service conditions, and a second for laterally unrestrained beams prior to the establishing the floor deck connections, or if those connections fail prematurely during service or under extreme loading. An equivalent loading method is proposed to obtain the approximate analytical solutions, in which the differential equations of equilibrium governing the problem are simplified by replacing the actual loading in the spandrel beams with a substitute loading. Numerical solutions are also obtained from three-dimensional finite element analyses and their results are found to be in close agreement with the analytical solutions for two of the three common types of load-bearing precast, prestressed concrete spandrel beams. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000498 [article] Elastic solutions for eccentrically loaded, slender, rectangular spandrel beams [texte imprimé] / Bulent Mercan, Auteur ; Arturo E. Schultz, Auteur ; Stolarski, Henry K., Auteur . - 2012 . - pp. 911–921. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 7 (Juillet 2012) . - pp. 911–921 Mots-clés : Precast  concrete  Prestressed  concrete  Lateral  displacement  Eccentric  loads  Analytical  techniques  Numerical  analysis Résumé : Spandrel beams in precast concrete buildings are widely used to support double-tee deck beams, particularly in parking garages. Spandrel beams of deep cross-sections, resisting eccentric loads from double-tee beams, can be susceptible to excessive lateral deformations and serviceability failures before reaching their strength limits. However, closed-form solutions for estimating lateral deflections in such members are not available in the technical literature. In this paper, approximate analytical solutions for the deflection of beams with thin rectangular sections are derived from second-order elastic analysis, and they are proposed for use in estimating maximum lateral deflections in spandrel beams under eccentric and uniformly distributed loads. Continuous lateral support is provided at the elevation of the floor deck to the spandrel beams. Thus, two cases are considered: one for laterally restrained beams under typical service conditions, and a second for laterally unrestrained beams prior to the establishing the floor deck connections, or if those connections fail prematurely during service or under extreme loading. An equivalent loading method is proposed to obtain the approximate analytical solutions, in which the differential equations of equilibrium governing the problem are simplified by replacing the actual loading in the spandrel beams with a substitute loading. Numerical solutions are also obtained from three-dimensional finite element analyses and their results are found to be in close agreement with the analytical solutions for two of the three common types of load-bearing precast, prestressed concrete spandrel beams. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000498

Finite-element models for slender, posttensioned masonry walls loaded out-of-plane / Jennifer R. Bean Popehn in Journal of structural engineering, Vol. 137 N° 12 (Décembre 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 12 (Décembre 2011) . - pp. 1489-1498 Titre : Finite-element models for slender, posttensioned masonry walls loaded out-of-plane Type de document : texte imprimé Auteurs : Jennifer R. Bean Popehn, Auteur ; Arturo E. Schultz, Auteur Année de publication : 2012 Article en page(s) : pp. 1489-1498 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Posttensioned  Masonry  Tendon  Stress  Transverse  loading  Out-of-plane  Flexure  Finite  element  DRAIN-2DX Résumé : Nonlinear finite-element models were developed, verified, and used to simulate the measured response of twelve 3.54 m (11.6 ft) tall posttensioned masonry walls with 810×100  mm (32×4  in.) cross sections that were tested to failure under uniform lateral loading in a laboratory. Variables included masonry type, wall slenderness, degree of tendon restraint, and prestress magnitude. The force-displacement relations obtained from the experimental tests of the walls were simulated using models developed by using an extended version of the program Dynamic Response Analysis of Inelastic Two-Dimensional Structures (DRAIN-2DX), and the results illustrate the influence of tensile strength, masonry type, magnitude of prestress, and tendon restraint on wall response to out-of-plane lateral loading. The computations indicate that load-displacement response of posttensioned masonry (PTM) walls is influenced by masonry tensile strength and that the stiffness and number of tendon restraints have a direct effect on peak load capacity and postpeak unloading slope. Tendon stress and masonry compression strain responses to applied loading were also investigated using finite-element analysis. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i12/p1489_s1?isAuthorized=no [article] Finite-element models for slender, posttensioned masonry walls loaded out-of-plane [texte imprimé] / Jennifer R. Bean Popehn, Auteur ; Arturo E. Schultz, Auteur . - 2012 . - pp. 1489-1498. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 12 (Décembre 2011) . - pp. 1489-1498 Mots-clés : Posttensioned  Masonry  Tendon  Stress  Transverse  loading  Out-of-plane  Flexure  Finite  element  DRAIN-2DX Résumé : Nonlinear finite-element models were developed, verified, and used to simulate the measured response of twelve 3.54 m (11.6 ft) tall posttensioned masonry walls with 810×100  mm (32×4  in.) cross sections that were tested to failure under uniform lateral loading in a laboratory. Variables included masonry type, wall slenderness, degree of tendon restraint, and prestress magnitude. The force-displacement relations obtained from the experimental tests of the walls were simulated using models developed by using an extended version of the program Dynamic Response Analysis of Inelastic Two-Dimensional Structures (DRAIN-2DX), and the results illustrate the influence of tensile strength, masonry type, magnitude of prestress, and tendon restraint on wall response to out-of-plane lateral loading. The computations indicate that load-displacement response of posttensioned masonry (PTM) walls is influenced by masonry tensile strength and that the stiffness and number of tendon restraints have a direct effect on peak load capacity and postpeak unloading slope. Tendon stress and masonry compression strain responses to applied loading were also investigated using finite-element analysis. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i12/p1489_s1?isAuthorized=no