Dépouillements

Probabilistic seismic loss assessment of a vancouver high-rise building / S. D. Koduru in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 235-245 Titre : Probabilistic seismic loss assessment of a vancouver high-rise building Type de document : texte imprimé Auteurs : S. D. Koduru, Auteur ; T. Haukaas, Auteur Année de publication : 2011 Article en page(s) : pp. 235-245 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Performance-based  engineering  Seismic  effects  Reliability Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A seismic loss curve of a real-world building is obtained by means of state-of-the-art models for the impending ground motion, the structure, the damage of structural and nonstructural components, and the ensuing losses. In particular, the seismic hazard at the building’s location (Vancouver, Canada) is described by a comprehensive probabilistic model. It is argued that this ground motion model is particularly appropriate in reliability analysis compared with the more common utilization of a limited set of scaled ground motions. In this paper the probabilistic integrals are carried out by means of a reliability formulation, in which a series of probabilistic models enter. This is referred to as unified reliability analysis to contrast the unified format of the probabilistic models with alternatives, such as suites of ground motions and fragility curves that themselves are created by reliability analysis. A key contribution in this paper is the comprehensive numerical example, which entails an inelastic dynamic analysis of a finite-element model of a building located in Vancouver. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p235_s1?isAuthorized=no [article] Probabilistic seismic loss assessment of a vancouver high-rise building [texte imprimé] / S. D. Koduru, Auteur ; T. Haukaas, Auteur . - 2011 . - pp. 235-245. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 235-245 Mots-clés : Performance-based  engineering  Seismic  effects  Reliability Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A seismic loss curve of a real-world building is obtained by means of state-of-the-art models for the impending ground motion, the structure, the damage of structural and nonstructural components, and the ensuing losses. In particular, the seismic hazard at the building’s location (Vancouver, Canada) is described by a comprehensive probabilistic model. It is argued that this ground motion model is particularly appropriate in reliability analysis compared with the more common utilization of a limited set of scaled ground motions. In this paper the probabilistic integrals are carried out by means of a reliability formulation, in which a series of probabilistic models enter. This is referred to as unified reliability analysis to contrast the unified format of the probabilistic models with alternatives, such as suites of ground motions and fragility curves that themselves are created by reliability analysis. A key contribution in this paper is the comprehensive numerical example, which entails an inelastic dynamic analysis of a finite-element model of a building located in Vancouver. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p235_s1?isAuthorized=no

Experimental seismic response of a full-scale light-frame wood building / Andre Filiatrault in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 246-254 Titre : Experimental seismic response of a full-scale light-frame wood building Type de document : texte imprimé Auteurs : Andre Filiatrault, Auteur ; Ioannis P. Christovasilis, Auteur ; Assawin Wanitkorkul, Auteur Année de publication : 2011 Article en page(s) : pp. 246-254 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Buildings  Gypsum  Seismic  tests  Shake  table  tests  Wood  structures Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A full-scale, two-story, light-frame wood townhouse building, designed according to modern U.S. engineered seismic design requirements, was tested on two triaxial shake tables operating in unison. The main objective of this experimental study was to determine the dynamic characteristics and the seismic performance of the test building under various base input intensities, representative of both ordinary and near-field ground motions in southern California. The building was tested with and without interior (gypsum wallboard) and exterior (stucco) wall finishes. The test results revealed that the installation of gypsum wallboard to the interior surfaces of structural wood sheathed walls substantially improved the seismic response of the test building. The application of exterior stucco further improved the seismic response of the test building, particularly in its longitudinal direction, where the shear response of low aspect ratio wall piers dominated. These shake table test results provide the evidence of the significant influence that wall finish materials have on the behavior of lateral load-resisting systems in light-frame wood construction. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p246_s1?isAuthorized=no [article] Experimental seismic response of a full-scale light-frame wood building [texte imprimé] / Andre Filiatrault, Auteur ; Ioannis P. Christovasilis, Auteur ; Assawin Wanitkorkul, Auteur . - 2011 . - pp. 246-254. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 246-254 Mots-clés : Buildings  Gypsum  Seismic  tests  Shake  table  tests  Wood  structures Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A full-scale, two-story, light-frame wood townhouse building, designed according to modern U.S. engineered seismic design requirements, was tested on two triaxial shake tables operating in unison. The main objective of this experimental study was to determine the dynamic characteristics and the seismic performance of the test building under various base input intensities, representative of both ordinary and near-field ground motions in southern California. The building was tested with and without interior (gypsum wallboard) and exterior (stucco) wall finishes. The test results revealed that the installation of gypsum wallboard to the interior surfaces of structural wood sheathed walls substantially improved the seismic response of the test building. The application of exterior stucco further improved the seismic response of the test building, particularly in its longitudinal direction, where the shear response of low aspect ratio wall piers dominated. These shake table test results provide the evidence of the significant influence that wall finish materials have on the behavior of lateral load-resisting systems in light-frame wood construction. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p246_s1?isAuthorized=no

Large-scale experimental study of precast segmental unbonded posttensioned concrete bridge columns for seismic regions / Yu-Chen Ou in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 255-264 Titre : Large-scale experimental study of precast segmental unbonded posttensioned concrete bridge columns for seismic regions Type de document : texte imprimé Auteurs : Yu-Chen Ou, Auteur ; Ping-Hsiung Wang, Auteur ; Mu-Sen Tsai, Auteur Année de publication : 2011 Article en page(s) : pp. 255-264 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Substructures  Bridges  Seismic  tests  Precast  concrete  Prestressed  concrete  Concrete  columns  Hollow  sections Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The seismic behavior of the proposed precast segmental unbonded posttensioned concrete bridge columns for use in regions of high seismicity was investigated experimentally. Posttensioning tendons were placed in the hollow core of the columns and left unbonded with the surrounding concrete to decrease prestress loss during earthquakes. Bonded mild steel bars continuous across the segment joints, also referred to as energy dissipation (ED) bars, were used to enhance the seismic resistance of the columns. The bars were unbonded at the critical joint to avoid premature low cycle fatigue failure. The objectives of this study were to (1) verify the proposed construction method and seismic detailing for the ED bars and (2) investigate the seismic behavior of the columns with different ED bar ratios and posttensioning forces. Four large-scale specimens were designed and tested with lateral cyclic loading. Test results showed that the proposed construction method and seismic detailing for the ED bars were effective in ensuring the ductility and ED capability of the bars. The specimens exhibited excellent drift capacities that are adequate for use in regions of high seismicity. The hysteretic ED capacity and residual drift of the column increased as the ED bar contribution to the expected column strength λED increased. To maintain self-centering capability, λED of more than 35% is not recommended. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p255_s1?isAuthorized=no [article] Large-scale experimental study of precast segmental unbonded posttensioned concrete bridge columns for seismic regions [texte imprimé] / Yu-Chen Ou, Auteur ; Ping-Hsiung Wang, Auteur ; Mu-Sen Tsai, Auteur . - 2011 . - pp. 255-264. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 255-264 Mots-clés : Substructures  Bridges  Seismic  tests  Precast  concrete  Prestressed  concrete  Concrete  columns  Hollow  sections Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The seismic behavior of the proposed precast segmental unbonded posttensioned concrete bridge columns for use in regions of high seismicity was investigated experimentally. Posttensioning tendons were placed in the hollow core of the columns and left unbonded with the surrounding concrete to decrease prestress loss during earthquakes. Bonded mild steel bars continuous across the segment joints, also referred to as energy dissipation (ED) bars, were used to enhance the seismic resistance of the columns. The bars were unbonded at the critical joint to avoid premature low cycle fatigue failure. The objectives of this study were to (1) verify the proposed construction method and seismic detailing for the ED bars and (2) investigate the seismic behavior of the columns with different ED bar ratios and posttensioning forces. Four large-scale specimens were designed and tested with lateral cyclic loading. Test results showed that the proposed construction method and seismic detailing for the ED bars were effective in ensuring the ductility and ED capability of the bars. The specimens exhibited excellent drift capacities that are adequate for use in regions of high seismicity. The hysteretic ED capacity and residual drift of the column increased as the ED bar contribution to the expected column strength λED increased. To maintain self-centering capability, λED of more than 35% is not recommended. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p255_s1?isAuthorized=no

Displacement method for the long-term analysis of steel-concrete beams with flexible connection / Francesca Giussani in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 265-274 Titre : Displacement method for the long-term analysis of steel-concrete beams with flexible connection Type de document : texte imprimé Auteurs : Francesca Giussani, Auteur ; Franco Mola, Auteur Année de publication : 2011 Article en page(s) : pp. 265-274 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Composite  steel-concrete  beams  Deformable  connectors  Creep  Shrinkage  Prestressing  Imposed  displacements Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The long-term behavior in the service stage of continuous composite steel-concrete beams with deformable connectors subjected to uniaxial bending and axial load is presented. The problem is dealt with by recurring to the displacement method, assuming the bending curvature and the longitudinal deformation as unknowns, and obtaining a system of differential and integro-differential equations. The results are compared with literature experimental tests. A case study is then discussed, referring to a continuous beam subjected to permanent and variable loads, to concrete shrinkage, and to a vertical displacement imposed to the central support or to the prestressing of the central part of the beam. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p265_s1?isAuthorized=no [article] Displacement method for the long-term analysis of steel-concrete beams with flexible connection [texte imprimé] / Francesca Giussani, Auteur ; Franco Mola, Auteur . - 2011 . - pp. 265-274. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 265-274 Mots-clés : Composite  steel-concrete  beams  Deformable  connectors  Creep  Shrinkage  Prestressing  Imposed  displacements Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The long-term behavior in the service stage of continuous composite steel-concrete beams with deformable connectors subjected to uniaxial bending and axial load is presented. The problem is dealt with by recurring to the displacement method, assuming the bending curvature and the longitudinal deformation as unknowns, and obtaining a system of differential and integro-differential equations. The results are compared with literature experimental tests. A case study is then discussed, referring to a continuous beam subjected to permanent and variable loads, to concrete shrinkage, and to a vertical displacement imposed to the central support or to the prestressing of the central part of the beam. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p265_s1?isAuthorized=no

Development and validation of 3D composite structural elements at elevated temperatures / Chaoming Yu in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 275-284 Titre : Development and validation of 3D composite structural elements at elevated temperatures Type de document : texte imprimé Auteurs : Chaoming Yu, Auteur ; Zhaohui Huang, Auteur ; Ian W. Burgess, Auteur Année de publication : 2011 Article en page(s) : pp. 275-284 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : 3D  Constitutive  model  Brick  element  Structural  fire  behavior  Composite  structure Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A three-dimensional (3D) eight-noded brick element, which is capable of representing the performance of composite structures subjected to 3D stress conditions at ambient and high temperatures, has been developed and incorporated into a finite-element analysis program Vulcan. In the formulation of this element, geometric nonlinearity, material nonlinearity, material degradation, and thermal expansion at elevated temperatures have been taken into account. The von Mises and Drucker-Prager theories were chosen as the 3D failure criteria for steel and concrete, respectively. In particular, a series of postfailure criteria and corresponding 3D constitutive relations for concrete at high temperatures were defined in this study. The accuracy and efficiency of this newly developed structural element was verified against the results from a number of tests on composite structures subjected to 3D stress conditions at both ambient and elevated temperatures. The proposed 3D structural element can be used to model a large range of composite structures in fire, and perform more detailed studies on them DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p275_s1?isAuthorized=no [article] Development and validation of 3D composite structural elements at elevated temperatures [texte imprimé] / Chaoming Yu, Auteur ; Zhaohui Huang, Auteur ; Ian W. Burgess, Auteur . - 2011 . - pp. 275-284. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 275-284 Mots-clés : 3D  Constitutive  model  Brick  element  Structural  fire  behavior  Composite  structure Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A three-dimensional (3D) eight-noded brick element, which is capable of representing the performance of composite structures subjected to 3D stress conditions at ambient and high temperatures, has been developed and incorporated into a finite-element analysis program Vulcan. In the formulation of this element, geometric nonlinearity, material nonlinearity, material degradation, and thermal expansion at elevated temperatures have been taken into account. The von Mises and Drucker-Prager theories were chosen as the 3D failure criteria for steel and concrete, respectively. In particular, a series of postfailure criteria and corresponding 3D constitutive relations for concrete at high temperatures were defined in this study. The accuracy and efficiency of this newly developed structural element was verified against the results from a number of tests on composite structures subjected to 3D stress conditions at both ambient and elevated temperatures. The proposed 3D structural element can be used to model a large range of composite structures in fire, and perform more detailed studies on them DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p275_s1?isAuthorized=no

Finite-element modeling of nonlinear behavior of masonry-infilled RC frames / Andreas Stavridis in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 285-296 Titre : Finite-element modeling of nonlinear behavior of masonry-infilled RC frames Type de document : texte imprimé Auteurs : Andreas Stavridis, Auteur ; P. B. Shing, Auteur Année de publication : 2011 Article en page(s) : pp. 285-296 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Masonry  Reinforced  concrete  Finite-element  method  Shear  failure  Seismic  assessment  Earthquake  performance  Smeared-crack  models  Discrete  crack  models  Cohesive  interface  models  Infill Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The evaluation of the seismic performance of masonry-infilled reinforced concrete (RC) frames has been a major challenge for structural engineers. This paper addresses pertinent issues on the development and calibration of nonlinear finite-element models for assessing the seismic performance of these structures. The modeling scheme considered here combines the smeared and discrete crack approaches to capture the different failure modes of infilled frames, including the mixed-mode fracture of mortar joints and the shear failure of RC members. A systematic approach is presented here to calibrate the material parameters, and the accuracy of the nonlinear finite-element models has been evaluated with experimental data. The comparison of the numerical and experimental results indicates that the models can successfully capture the highly nonlinear behavior of the physical specimens and accurately predict their strength and failure mechanisms. The validated models have been used to assess the sensitivity of the numerical results to the modeling parameters and to identify the critical material parameters through a parametric study. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p285_s1?isAuthorized=no [article] Finite-element modeling of nonlinear behavior of masonry-infilled RC frames [texte imprimé] / Andreas Stavridis, Auteur ; P. B. Shing, Auteur . - 2011 . - pp. 285-296. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 285-296 Mots-clés : Masonry  Reinforced  concrete  Finite-element  method  Shear  failure  Seismic  assessment  Earthquake  performance  Smeared-crack  models  Discrete  crack  models  Cohesive  interface  models  Infill Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The evaluation of the seismic performance of masonry-infilled reinforced concrete (RC) frames has been a major challenge for structural engineers. This paper addresses pertinent issues on the development and calibration of nonlinear finite-element models for assessing the seismic performance of these structures. The modeling scheme considered here combines the smeared and discrete crack approaches to capture the different failure modes of infilled frames, including the mixed-mode fracture of mortar joints and the shear failure of RC members. A systematic approach is presented here to calibrate the material parameters, and the accuracy of the nonlinear finite-element models has been evaluated with experimental data. The comparison of the numerical and experimental results indicates that the models can successfully capture the highly nonlinear behavior of the physical specimens and accurately predict their strength and failure mechanisms. The validated models have been used to assess the sensitivity of the numerical results to the modeling parameters and to identify the critical material parameters through a parametric study. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p285_s1?isAuthorized=no

Finite-element analysis of fluid-structure interaction in a blast-resistant window system / Jae H. Chung in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 297-306 Titre : Finite-element analysis of fluid-structure interaction in a blast-resistant window system Type de document : texte imprimé Auteurs : Jae H. Chung, Auteur ; Gary R. Consolazio, Auteur ; Robert J. Dinan, Auteur Année de publication : 2011 Article en page(s) : pp. 297-306 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Blast  loading  Finite  element  method  Dynamics  response  Computer  models  Fluid-structure  interaction  Full-scale  tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper describes the development of a finite-element model capable of representing a blast-resistant flexible window (flex window) system developed by the Air Force Research Laboratory/Airbase Technologies Division. Computational fluid-structure interaction finite-element simulations are used to develop an improved understanding of the manner in which fluid phenomena, such as air compression and flow, affect the behavior of the flex-window system under blast loading. Compressible airflow interacting with a flexible thin-shell structure of the flex window (transient air-window panel interaction phenomena) is found to significantly influence system performance. The influences of shock wave propagation and fluid venting inside the damping chamber of the flex-window system are quantified and the influences of such phenomena on panel deflections, deformations, and internal forces are presented. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p297_s1?isAuthorized=no [article] Finite-element analysis of fluid-structure interaction in a blast-resistant window system [texte imprimé] / Jae H. Chung, Auteur ; Gary R. Consolazio, Auteur ; Robert J. Dinan, Auteur . - 2011 . - pp. 297-306. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 297-306 Mots-clés : Blast  loading  Finite  element  method  Dynamics  response  Computer  models  Fluid-structure  interaction  Full-scale  tests Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper describes the development of a finite-element model capable of representing a blast-resistant flexible window (flex window) system developed by the Air Force Research Laboratory/Airbase Technologies Division. Computational fluid-structure interaction finite-element simulations are used to develop an improved understanding of the manner in which fluid phenomena, such as air compression and flow, affect the behavior of the flex-window system under blast loading. Compressible airflow interacting with a flexible thin-shell structure of the flex window (transient air-window panel interaction phenomena) is found to significantly influence system performance. The influences of shock wave propagation and fluid venting inside the damping chamber of the flex-window system are quantified and the influences of such phenomena on panel deflections, deformations, and internal forces are presented. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p297_s1?isAuthorized=no

Damage identification in a truss tower by regularized model updating / Benedikt Weber in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 307-316 Titre : Damage identification in a truss tower by regularized model updating Type de document : texte imprimé Auteurs : Benedikt Weber, Auteur ; Patrick Paultre, Auteur Année de publication : 2011 Article en page(s) : pp. 307-316 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Model  update  Regularization  Damage  identification  Sensitivity-based  Truss Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents a sensitivity-based damage identification of a three-dimensional truss tower tested in the laboratory. A finite-element model is updated by modal parameters obtained from ambient vibration measurements. The paper focuses on details of modeling and model updating. To get a realistic model, it was necessary to include eccentric connections, bending stiffness in truss members, and foundation flexibility. For model updating, a number of mathematical techniques are combined in a consistent way, including regularization of the nonlinear updating problem and its linearization. Considering all these details correctly, damage in the truss has been successfully identified. However, it is also demonstrated how neglecting some of these algorithmic details can lead to incorrect results. It is also shown how static condensation can lead to a model that is valid for the undamaged case but cannot adequately represent the damaged case. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p307_s1?isAuthorized=no [article] Damage identification in a truss tower by regularized model updating [texte imprimé] / Benedikt Weber, Auteur ; Patrick Paultre, Auteur . - 2011 . - pp. 307-316. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 307-316 Mots-clés : Model  update  Regularization  Damage  identification  Sensitivity-based  Truss Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents a sensitivity-based damage identification of a three-dimensional truss tower tested in the laboratory. A finite-element model is updated by modal parameters obtained from ambient vibration measurements. The paper focuses on details of modeling and model updating. To get a realistic model, it was necessary to include eccentric connections, bending stiffness in truss members, and foundation flexibility. For model updating, a number of mathematical techniques are combined in a consistent way, including regularization of the nonlinear updating problem and its linearization. Considering all these details correctly, damage in the truss has been successfully identified. However, it is also demonstrated how neglecting some of these algorithmic details can lead to incorrect results. It is also shown how static condensation can lead to a model that is valid for the undamaged case but cannot adequately represent the damaged case. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p307_s1?isAuthorized=no

Distortional buckling of cold-formed steel shear wall studs under uplift force / Cheng Yu in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 317-323 Titre : Distortional buckling of cold-formed steel shear wall studs under uplift force Type de document : texte imprimé Auteurs : Cheng Yu, Auteur Année de publication : 2011 Article en page(s) : pp. 317-323 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cold-formed  steel  Shear  wall  Distortional  buckling  Direct  strength  method Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A cold-formed steel framed shear wall may fail in shear buckling of the sheathing, local buckling or distortional buckling of the framing member under compression forces or connection failures. An unusual distortional buckling mode on boundary studs under uplift forces was recently observed in a shear wall test program conducted at the University of North Texas. It was found in monotonic pushover shear wall tests that the flanges of the boundary studs undertaking uplift forces were distorted at the bottom area of the studs near the hold-down. This paper presents the test program and analysis of the unique distortional buckling mode. The paper also provides procedures for predicting the distortional buckling strength of the boundary studs, as well as the construction details to mitigate the damage by this unexpected distortional buckling mode. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p317_s1?isAuthorized=no [article] Distortional buckling of cold-formed steel shear wall studs under uplift force [texte imprimé] / Cheng Yu, Auteur . - 2011 . - pp. 317-323. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 317-323 Mots-clés : Cold-formed  steel  Shear  wall  Distortional  buckling  Direct  strength  method Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A cold-formed steel framed shear wall may fail in shear buckling of the sheathing, local buckling or distortional buckling of the framing member under compression forces or connection failures. An unusual distortional buckling mode on boundary studs under uplift forces was recently observed in a shear wall test program conducted at the University of North Texas. It was found in monotonic pushover shear wall tests that the flanges of the boundary studs undertaking uplift forces were distorted at the bottom area of the studs near the hold-down. This paper presents the test program and analysis of the unique distortional buckling mode. The paper also provides procedures for predicting the distortional buckling strength of the boundary studs, as well as the construction details to mitigate the damage by this unexpected distortional buckling mode. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p317_s1?isAuthorized=no

Safety of structures in strong winds and earthquakes / Dat Duthinh in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 330-333 Titre : Safety of structures in strong winds and earthquakes : multihazard considerations Type de document : texte imprimé Auteurs : Dat Duthinh, Auteur ; Simiu, Emil, Auteur Année de publication : 2011 Article en page(s) : pp. 330-333 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Building  technology  Earthquakes  Limit  states  Multihazards  Safety  Wind  loads Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In accordance with the ASCE Standard 7-05, in regions subjected to wind and earthquakes, structures are designed for loads induced by wind and, separately, by earthquakes, and the final design is based on the more demanding of these two loading conditions. Implicit in this approach is the belief that the standard assures risks of exceedance of the specified limit states that are essentially identical to the risks inherent in the provisions for regions where only wind or earthquakes occur. We draw the attention of designers, code writers, and insurers to the fact that this belief is, in general, unwarranted, and that ASCE 7 provisions are not risk consistent, i.e., in regions with significant wind and seismic hazards, risks of exceedance of limit states can be up to twice as high as those for regions where one hazard dominates. This conclusion is valid even if the limit states due to wind and earthquake are defined differently, as is the case in ASCE 7. We propose an approach to modifying ASCE 7 provisions which guarantees that risks implicit in minimum ASCE 7 requirements for regions where one hazard dominates are not exceeded for structures in regions with strong wind and seismic hazards. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p330_s1?isAuthorized=no [article] Safety of structures in strong winds and earthquakes : multihazard considerations [texte imprimé] / Dat Duthinh, Auteur ; Simiu, Emil, Auteur . - 2011 . - pp. 330-333. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 330-333 Mots-clés : Building  technology  Earthquakes  Limit  states  Multihazards  Safety  Wind  loads Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In accordance with the ASCE Standard 7-05, in regions subjected to wind and earthquakes, structures are designed for loads induced by wind and, separately, by earthquakes, and the final design is based on the more demanding of these two loading conditions. Implicit in this approach is the belief that the standard assures risks of exceedance of the specified limit states that are essentially identical to the risks inherent in the provisions for regions where only wind or earthquakes occur. We draw the attention of designers, code writers, and insurers to the fact that this belief is, in general, unwarranted, and that ASCE 7 provisions are not risk consistent, i.e., in regions with significant wind and seismic hazards, risks of exceedance of limit states can be up to twice as high as those for regions where one hazard dominates. This conclusion is valid even if the limit states due to wind and earthquake are defined differently, as is the case in ASCE 7. We propose an approach to modifying ASCE 7 provisions which guarantees that risks implicit in minimum ASCE 7 requirements for regions where one hazard dominates are not exceeded for structures in regions with strong wind and seismic hazards. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p330_s1?isAuthorized=no

Analysis of wind-induced clip loads on standing seam metal roofs / Murray J. Morrison in Journal of structural engineering, Vol. 136 N° 3 (Mars 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 334-337 Titre : Analysis of wind-induced clip loads on standing seam metal roofs Type de document : texte imprimé Auteurs : Murray J. Morrison, Auteur ; Gregory A. Kopp, Auteur Année de publication : 2011 Article en page(s) : pp. 334-337 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Wind  loads  Roof  failures  Buildings  Low-rise  Standards  and  codes  Aerodynamics Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The current investigation extends the previous work in calculating components and cladding loads for standing seam metal roof clips. It was found that the ASCE 7-05 wind loads for these clips are conservative, while several other studies have shown that the ASCE 7-05 is unconservative when compared to integrated wind tunnel pressure data. The current note resolves this contradiction, showing that the observed conservatism is primarily due to the fact that the critical clips are not located in the worst aerodynamic region of the roof. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p334_s1?isAuthorized=no [article] Analysis of wind-induced clip loads on standing seam metal roofs [texte imprimé] / Murray J. Morrison, Auteur ; Gregory A. Kopp, Auteur . - 2011 . - pp. 334-337. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 3 (Mars 2010) . - pp. 334-337 Mots-clés : Wind  loads  Roof  failures  Buildings  Low-rise  Standards  and  codes  Aerodynamics Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The current investigation extends the previous work in calculating components and cladding loads for standing seam metal roof clips. It was found that the ASCE 7-05 wind loads for these clips are conservative, while several other studies have shown that the ASCE 7-05 is unconservative when compared to integrated wind tunnel pressure data. The current note resolves this contradiction, showing that the observed conservatism is primarily due to the fact that the critical clips are not located in the worst aerodynamic region of the roof. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i3/p334_s1?isAuthorized=no

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