Documents disponibles écrits par cet auteur

Behavior of bidirectional spring unit in isolated floor systems / Shenlei Cui in Journal of structural engineering, Vol. 136 N° 8 (Août 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 944-952 Titre : Behavior of bidirectional spring unit in isolated floor systems Type de document : texte imprimé Auteurs : Shenlei Cui, Auteur ; Michel Bruneau, Auteur ; Amarnath Kasalanati, Auteur Année de publication : 2011 Article en page(s) : pp. 944-952 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Structural  engineering  Seismic  design  Earthquake  Isolation  Models  Floor  isolation  Spring  unit Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : To investigate the mechanical behavior of bidirectional spring units used as isolators in a kind of isolated floor system, three types of characterization tests were conducted—from spring components alone to the complete spring unit in its implemented configuration. The test results show that the behavior of the springs and spring units is stable when subjected to cyclic repeated motions, and is not sensitive to the velocity of motion. The hysteretic behavior of the spring units was found to be unconventional, with bilinear and different ascending (loading) and descending (unloading) branches. Based on the experimental behavior, a physical model was developed to replicate the unique behavior of such bidirectional spring units. Good agreement was found from the comparison between the results from the physical model and the corresponding tests. Finally, a sensitivity study, with respect to the model’s four primary defining parameters, shows that this physical model is more sensitive to the sliding friction coefficient between the spring cable and the bushing in the spring unit than to the other three parameters. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p944_s1?isAuthorized=no [article] Behavior of bidirectional spring unit in isolated floor systems [texte imprimé] / Shenlei Cui, Auteur ; Michel Bruneau, Auteur ; Amarnath Kasalanati, Auteur . - 2011 . - pp. 944-952. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 944-952 Mots-clés : Structural  engineering  Seismic  design  Earthquake  Isolation  Models  Floor  isolation  Spring  unit Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : To investigate the mechanical behavior of bidirectional spring units used as isolators in a kind of isolated floor system, three types of characterization tests were conducted—from spring components alone to the complete spring unit in its implemented configuration. The test results show that the behavior of the springs and spring units is stable when subjected to cyclic repeated motions, and is not sensitive to the velocity of motion. The hysteretic behavior of the spring units was found to be unconventional, with bilinear and different ascending (loading) and descending (unloading) branches. Based on the experimental behavior, a physical model was developed to replicate the unique behavior of such bidirectional spring units. Good agreement was found from the comparison between the results from the physical model and the corresponding tests. Finally, a sensitivity study, with respect to the model’s four primary defining parameters, shows that this physical model is more sensitive to the sliding friction coefficient between the spring cable and the bushing in the spring unit than to the other three parameters. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p944_s1?isAuthorized=no

Behavior of self-centering steel plate shear walls and design considerations / Daniel M. Dowden in Journal of structural engineering, Vol. 138 N° 1 (Janvier 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 11-21 Titre : Behavior of self-centering steel plate shear walls and design considerations Type de document : texte imprimé Auteurs : Daniel M. Dowden, Auteur ; Ronny Purba, Auteur ; Michel Bruneau, Auteur Année de publication : 2012 Article en page(s) : pp. 11-21 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Self-centering  Rocking  connection  Steel  plate  Shear  wall  Earthquake  engineering Résumé : This paper presents insights on the combined contribution of posttensioning and beam-to-column joint rocking connection in self-centering steel plate shear walls (SC-SPSWs). Moment, shear, and axial force diagrams along the boundary beam are developed based on capacity design principles and are compared with nonlinear cyclic push-over analysis results. These closed-form solutions are integrated into a design procedure to select cross-sectional areas of the posttension reinforcement and beam sizes: (1) to prevent in-span plastic hinges; (2) to ensure that posttension reinforcement remains elastic to maintain self-centering capability of the system; (3) to impose sufficient initial posttensioning to overcome wind and gravity loads; (4) to provide adequate beam plastic strength considering reduced moment capacity due to the presence of axial and shear forces; and (5) to consider posttension losses due to axial beam shortening. Using this fundamental behavior knowledge, and adding response-based performance objectives to the design procedure, a companion paper investigates the seismic response of SC-SPSW using time-history nonlinear analyses. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i1/p11_s1?isAuthorized=no [article] Behavior of self-centering steel plate shear walls and design considerations [texte imprimé] / Daniel M. Dowden, Auteur ; Ronny Purba, Auteur ; Michel Bruneau, Auteur . - 2012 . - pp. 11-21. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 11-21 Mots-clés : Self-centering  Rocking  connection  Steel  plate  Shear  wall  Earthquake  engineering Résumé : This paper presents insights on the combined contribution of posttensioning and beam-to-column joint rocking connection in self-centering steel plate shear walls (SC-SPSWs). Moment, shear, and axial force diagrams along the boundary beam are developed based on capacity design principles and are compared with nonlinear cyclic push-over analysis results. These closed-form solutions are integrated into a design procedure to select cross-sectional areas of the posttension reinforcement and beam sizes: (1) to prevent in-span plastic hinges; (2) to ensure that posttension reinforcement remains elastic to maintain self-centering capability of the system; (3) to impose sufficient initial posttensioning to overcome wind and gravity loads; (4) to provide adequate beam plastic strength considering reduced moment capacity due to the presence of axial and shear forces; and (5) to consider posttension losses due to axial beam shortening. Using this fundamental behavior knowledge, and adding response-based performance objectives to the design procedure, a companion paper investigates the seismic response of SC-SPSW using time-history nonlinear analyses. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i1/p11_s1?isAuthorized=no

Bidirectional seismic behavior of controlled rocking four-legged bridge steel truss piers / Michael Pollino in Journal of structural engineering, Vol. 136 N° 12 (Décembre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1512-1522 Titre : Bidirectional seismic behavior of controlled rocking four-legged bridge steel truss piers Type de document : texte imprimé Auteurs : Michael Pollino, Auteur ; Michel Bruneau, Auteur Année de publication : 2011 Article en page(s) : pp. 1512-1522 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Controlled  rocking  Seismic  Behavior  Design  Bridge  piers  Rocking  Passive  energy  dissipation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The behavior and design of four-legged controlled rocking bridge steel truss piers to three components of seismic excitation are presented in this paper. The controlled rocking approach for seismic protection allows a pier to uplift from its base, limiting the force demands placed on the bridge pier and deck, and can allow the structure to remain elastic during an earthquake, preventing damage toward the goal of keeping the bridge operational immediately following the earthquake. Passive energy dissipation devices [steel yielding devices (SYDs) or fluid viscous dampers (VDs)] are used at the uplifting location to control pier response. The bidirectional kinematic and hysteretic cyclic behavior of controlled rocking piers with SYDs is presented and verified with nonlinear static pushover analysis. This fundamental behavior is used to develop design equations to predict peak pier displacements, uplifting displacements, and forces (frame shear and leg axial force). Dynamic response history analyses are performed, compared with the design equations, and shown to provide reasonably accurate results for design. The use of fluid VDs in the controlled rocking system is then discussed. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i12/p1512_s1?isAuthorized=no [article] Bidirectional seismic behavior of controlled rocking four-legged bridge steel truss piers [texte imprimé] / Michael Pollino, Auteur ; Michel Bruneau, Auteur . - 2011 . - pp. 1512-1522. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1512-1522 Mots-clés : Controlled  rocking  Seismic  Behavior  Design  Bridge  piers  Rocking  Passive  energy  dissipation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The behavior and design of four-legged controlled rocking bridge steel truss piers to three components of seismic excitation are presented in this paper. The controlled rocking approach for seismic protection allows a pier to uplift from its base, limiting the force demands placed on the bridge pier and deck, and can allow the structure to remain elastic during an earthquake, preventing damage toward the goal of keeping the bridge operational immediately following the earthquake. Passive energy dissipation devices [steel yielding devices (SYDs) or fluid viscous dampers (VDs)] are used at the uplifting location to control pier response. The bidirectional kinematic and hysteretic cyclic behavior of controlled rocking piers with SYDs is presented and verified with nonlinear static pushover analysis. This fundamental behavior is used to develop design equations to predict peak pier displacements, uplifting displacements, and forces (frame shear and leg axial force). Dynamic response history analyses are performed, compared with the design equations, and shown to provide reasonably accurate results for design. The use of fluid VDs in the controlled rocking system is then discussed. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i12/p1512_s1?isAuthorized=no

Capacity design of intermediate horizontal boundary elements of steel plate shear walls / Bing Qu in Journal of structural engineering, Vol. 136 N° 6 (Juin 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 6 (Juin 2010) . - pp. 665-675 Titre : Capacity design of intermediate horizontal boundary elements of steel plate shear walls Type de document : texte imprimé Auteurs : Bing Qu, Auteur ; Michel Bruneau, Auteur Année de publication : 2011 Article en page(s) : pp. 665-675 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Shear  walls  Steel  plates  Capacity  Design  Earthquake  engineering  Seismic  design Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Consistent with capacity design principles and requirements of ductile behavior, the 2005 AISC and 2001 CSA seismic design codes require that the intermediate horizontal boundary elements (HBEs) of steel plate shear walls (SPSWs) be designed to remain essentially elastic with the exception of plastic hinges at their ends when the infill plates fully yield under seismic loading. However, the unexpected failure observed during the tests on a full-scale two-story SPSW suggested that the current design approach does not necessarily lead to an intermediate HBE with the expected performance. This paper presents analytical models for estimating the design forces for intermediate HBEs to reliably achieve capacity design. Those models combine the assumed plastic mechanism with a linear beam model of intermediate HBE considering fully yielded infill panels and are able to prevent in-span plastic hinges. Design forces predicted using the proposed models are compared with those from nonlinear finite element analysis. Good agreement is observed. Finally, the proposed models are also used to explain the observed premature failure of intermediate HBE. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i6/p665_s1?isAuthorized=no [article] Capacity design of intermediate horizontal boundary elements of steel plate shear walls [texte imprimé] / Bing Qu, Auteur ; Michel Bruneau, Auteur . - 2011 . - pp. 665-675. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 6 (Juin 2010) . - pp. 665-675 Mots-clés : Shear  walls  Steel  plates  Capacity  Design  Earthquake  engineering  Seismic  design Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Consistent with capacity design principles and requirements of ductile behavior, the 2005 AISC and 2001 CSA seismic design codes require that the intermediate horizontal boundary elements (HBEs) of steel plate shear walls (SPSWs) be designed to remain essentially elastic with the exception of plastic hinges at their ends when the infill plates fully yield under seismic loading. However, the unexpected failure observed during the tests on a full-scale two-story SPSW suggested that the current design approach does not necessarily lead to an intermediate HBE with the expected performance. This paper presents analytical models for estimating the design forces for intermediate HBEs to reliably achieve capacity design. Those models combine the assumed plastic mechanism with a linear beam model of intermediate HBE considering fully yielded infill panels and are able to prevent in-span plastic hinges. Design forces predicted using the proposed models are compared with those from nonlinear finite element analysis. Good agreement is observed. Finally, the proposed models are also used to explain the observed premature failure of intermediate HBE. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i6/p665_s1?isAuthorized=no

Case study on the impact of horizontal boundary elements design on seismic behavior of steel plate shear walls / Ronny Purba in Journal of structural engineering, Vol. 138 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 5 (Mai 2012) . - pp.645–657. Titre : Case study on the impact of horizontal boundary elements design on seismic behavior of steel plate shear walls Type de document : texte imprimé Auteurs : Ronny Purba, Auteur ; Michel Bruneau, Auteur Année de publication : 2012 Article en page(s) : pp.645–657. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : In-span  plastic  hinge  Seismic  behavior  Steel  plate  shear  walls  Boundary  elements  design  Cumulative  plastic  incremental  deformation Résumé : A case study was conducted to investigate the seismic behavior of steel plate shear walls having boundary elements designed by two different philosophies. The first design approach does not guarantee that formation of in-span plastic hinges on horizontal boundary elements (HBEs) will be prevented, whereas the second approach guarantees that plastic hinges can only occur at the ends of HBEs. Pushover and nonlinear time-history analyses were conducted to investigate behavior. Results show that the development of in-span plastic hinges has significant consequences on the behavior of the structure through inducing (1) significant accumulation of plastic incremental deformations on the HBEs; (2) partial yielding of the infill plates; (3) lower global plastic strength compared with values predicted by code equations; and (4) total (elastic and plastic) HBE rotations greater than 0.03 radians after the structure was pushed cyclically up to a maximum lateral drift of 3%. Nonlinear time-history analyses also demonstrated that increasing the severity of the ground excitations [i.e., from design basis earthquake (DBE) to maximum considered earthquake (MCE)] acting on the structure with in-span plastic hinge accentuated the accumulation of plastic incremental deformations on the HBEs. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000490 [article] Case study on the impact of horizontal boundary elements design on seismic behavior of steel plate shear walls [texte imprimé] / Ronny Purba, Auteur ; Michel Bruneau, Auteur . - 2012 . - pp.645–657. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 5 (Mai 2012) . - pp.645–657. Mots-clés : In-span  plastic  hinge  Seismic  behavior  Steel  plate  shear  walls  Boundary  elements  design  Cumulative  plastic  incremental  deformation Résumé : A case study was conducted to investigate the seismic behavior of steel plate shear walls having boundary elements designed by two different philosophies. The first design approach does not guarantee that formation of in-span plastic hinges on horizontal boundary elements (HBEs) will be prevented, whereas the second approach guarantees that plastic hinges can only occur at the ends of HBEs. Pushover and nonlinear time-history analyses were conducted to investigate behavior. Results show that the development of in-span plastic hinges has significant consequences on the behavior of the structure through inducing (1) significant accumulation of plastic incremental deformations on the HBEs; (2) partial yielding of the infill plates; (3) lower global plastic strength compared with values predicted by code equations; and (4) total (elastic and plastic) HBE rotations greater than 0.03 radians after the structure was pushed cyclically up to a maximum lateral drift of 3%. Nonlinear time-history analyses also demonstrated that increasing the severity of the ground excitations [i.e., from design basis earthquake (DBE) to maximum considered earthquake (MCE)] acting on the structure with in-span plastic hinge accentuated the accumulation of plastic incremental deformations on the HBEs. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000490

Seismic testing of a bridge steel truss pier designed for controlled rocking / Michael Pollino in Journal of structural engineering, Vol. 136 N° 12 (Décembre 2010) 

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