Dépouillements

Characteristics of submerged jets in evolving scour hole downstream of an apron / Subhasish Dey in Journal of engineering mechanics, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.927–936. Titre : Characteristics of submerged jets in evolving scour hole downstream of an apron Type de document : texte imprimé Auteurs : Subhasish Dey, Auteur ; Arindam Sarkar, Auteur Année de publication : 2008 Article en page(s) : pp.927–936. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Erosion  Open  channels  Turbulent  flow  Submerged  jets  Scour  Sediment  transport  Hydraulic Résumé : This paper reports an experimental investigation on the velocity and turbulence characteristics in an evolving scour hole downstream of an apron due to submerged jets issuing from a sluice opening detected by an acoustic Doppler velocimeter. Experiments were carried out for the conditions of submerged jets, having submergence factors from 0.96 to 1.85 and jet Froude numbers from 2.58 to 4.87, over sediment beds downstream of a rigid apron. The distributions of time-averaged velocity vectors, turbulence intensities, and Reynolds stress at different streamwise distances are plotted for the conditions of initial flat bed, intermediate scour holes, and equilibrium scour hole downstream of an apron. Vector plots of the flow field show that the rate of decay of the submerged jet velocity increases with an increase in scour hole dimension. The bed-shear stresses are determined from the Reynolds stress distributions. The flow characteristics in evolving scour holes are analyzed in the context of self-preservation, growth of the length scale, and decay of the velocity and turbulence characteristics scales. The most significant observation is that the flow in the scour holes (intermediate and equilibrium) is found to be plausibly self-preserving. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...] [article] Characteristics of submerged jets in evolving scour hole downstream of an apron [texte imprimé] / Subhasish Dey, Auteur ; Arindam Sarkar, Auteur . - 2008 . - pp.927–936. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.927–936. Mots-clés : Erosion  Open  channels  Turbulent  flow  Submerged  jets  Scour  Sediment  transport  Hydraulic Résumé : This paper reports an experimental investigation on the velocity and turbulence characteristics in an evolving scour hole downstream of an apron due to submerged jets issuing from a sluice opening detected by an acoustic Doppler velocimeter. Experiments were carried out for the conditions of submerged jets, having submergence factors from 0.96 to 1.85 and jet Froude numbers from 2.58 to 4.87, over sediment beds downstream of a rigid apron. The distributions of time-averaged velocity vectors, turbulence intensities, and Reynolds stress at different streamwise distances are plotted for the conditions of initial flat bed, intermediate scour holes, and equilibrium scour hole downstream of an apron. Vector plots of the flow field show that the rate of decay of the submerged jet velocity increases with an increase in scour hole dimension. The bed-shear stresses are determined from the Reynolds stress distributions. The flow characteristics in evolving scour holes are analyzed in the context of self-preservation, growth of the length scale, and decay of the velocity and turbulence characteristics scales. The most significant observation is that the flow in the scour holes (intermediate and equilibrium) is found to be plausibly self-preserving. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...]

Analytical elastic solution based on fourier series for a laterally confined granular column / Dominik Schillinger in Journal of engineering mechanics, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.937–951. Titre : Analytical elastic solution based on fourier series for a laterally confined granular column Type de document : texte imprimé Auteurs : Dominik Schillinger, Auteur ; Ramesh B. Malla, Auteur Année de publication : 2008 Article en page(s) : pp.937–951. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Granular  materials  Elasticity  Fourier  transform  Fourier  series  Columns Résumé : This paper presents an analytical solution methodology for the complete stress and displacement fields of a laterally confined granular column loaded from the top end. The granular column is idealized as a homogeneous isotropic elastic medium with Coulomb’s friction at the lateral boundary. The solution methodology consists of an analytical procedure that incorporates a potential approach with trigonometric series and Bessel functions, finite Fourier transforms and the superposition method, and an iterative algorithm to satisfy the Coulomb’s friction condition at the lateral boundary. Stress and displacement fields are computed for a specific example and found completely consistent with corresponding finite element results. Key characteristics, computational errors, the convergence behavior, and restrictions of the present approach are discussed. The methodology developed herein can be beneficially applied in the validation process of numerical simulation techniques in granular mechanics such as finite or discrete element methods. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...] [article] Analytical elastic solution based on fourier series for a laterally confined granular column [texte imprimé] / Dominik Schillinger, Auteur ; Ramesh B. Malla, Auteur . - 2008 . - pp.937–951. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.937–951. Mots-clés : Granular  materials  Elasticity  Fourier  transform  Fourier  series  Columns Résumé : This paper presents an analytical solution methodology for the complete stress and displacement fields of a laterally confined granular column loaded from the top end. The granular column is idealized as a homogeneous isotropic elastic medium with Coulomb’s friction at the lateral boundary. The solution methodology consists of an analytical procedure that incorporates a potential approach with trigonometric series and Bessel functions, finite Fourier transforms and the superposition method, and an iterative algorithm to satisfy the Coulomb’s friction condition at the lateral boundary. Stress and displacement fields are computed for a specific example and found completely consistent with corresponding finite element results. Key characteristics, computational errors, the convergence behavior, and restrictions of the present approach are discussed. The methodology developed herein can be beneficially applied in the validation process of numerical simulation techniques in granular mechanics such as finite or discrete element methods. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...]

Solid Shell Element Based on Relative Displacement concept / Yong-Qian Ma in Journal of engineering mechanics, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.952–960. Titre : Solid Shell Element Based on Relative Displacement concept Type de document : texte imprimé Auteurs : Yong-Qian Ma, Auteur ; Kok-Keng Ang, Auteur Année de publication : 2008 Article en page(s) : pp.952–960. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Plates  Shells  Kinematics  Displacement  Finite  element  method  Numerical  anPlates,  Shells,  Kinematics,  Displacement,  Finite  element  method,  Numerical  analysisRead  More:  http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29073Plates,  Shells,  Kinematics,  Displacement,  Finite  element  method,  Numerical  analysisRead  More:  hPlates,  Shells,  Kinematics,  Displacement,  Finite  element  method,  Numerical  analysis Résumé : The relative translational displacement concept can avoid the difficulties when involving the rotational degrees of freedom (DOF) and retain the features associated with the rotational DOF. In this paper, a new solid shell element based on relative displacement is proposed and studied. This new isoparameteric element ensures the C0 continuity between elements. To circumvent the shear-locking phenomenon, The assumed natural strain method is incorporated, and nonconforming shape functions are utilized to improve the performance of the proposed element. Verifications by standard numerical examples show that the performance of this solid shell element is excellent. ISSN : 0733-9399 En ligne : Plates, Shells, Kinematics, Disphttp://ascelibrary.org/doi/abs/10.1061/%28ASCE%2 [...] [article] Solid Shell Element Based on Relative Displacement concept [texte imprimé] / Yong-Qian Ma, Auteur ; Kok-Keng Ang, Auteur . - 2008 . - pp.952–960. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.952–960. Mots-clés : Plates  Shells  Kinematics  Displacement  Finite  element  method  Numerical  anPlates,  Shells,  Kinematics,  Displacement,  Finite  element  method,  Numerical  analysisRead  More:  http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29073Plates,  Shells,  Kinematics,  Displacement,  Finite  element  method,  Numerical  analysisRead  More:  hPlates,  Shells,  Kinematics,  Displacement,  Finite  element  method,  Numerical  analysis Résumé : The relative translational displacement concept can avoid the difficulties when involving the rotational degrees of freedom (DOF) and retain the features associated with the rotational DOF. In this paper, a new solid shell element based on relative displacement is proposed and studied. This new isoparameteric element ensures the C0 continuity between elements. To circumvent the shear-locking phenomenon, The assumed natural strain method is incorporated, and nonconforming shape functions are utilized to improve the performance of the proposed element. Verifications by standard numerical examples show that the performance of this solid shell element is excellent. ISSN : 0733-9399 En ligne : Plates, Shells, Kinematics, Disphttp://ascelibrary.org/doi/abs/10.1061/%28ASCE%2 [...]

Dynamic analysis of nonlinear frames by prandtl neural networks / Abdolreza Joghataie in Journal of engineering mechanics, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.961–969. Titre : Dynamic analysis of nonlinear frames by prandtl neural networks Type de document : texte imprimé Auteurs : Abdolreza Joghataie, Auteur ; Mojtaba Farrokh, Auteur Année de publication : 2008 Article en page(s) : pp.961–969. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Neural  networks  Algorithms  Nonlinear  analysis  Hysteresis  Frames  Ground  motion  Dynamic  analysis Résumé : A new type of activation function, based on the use of the Prandtl–Ishlinskii operator, has been developed and used in the feed forward neural networks in order to improve their capabilities in learning to identify and analyze nonlinear structures subject to dynamic loading. The genetic algorithm has been used in its training. The neural network, which is referred to as the Prandtl neural network here, has been trained and used in the analysis of two shear frames, a single degree of freedom (SDOF) and a 3DOF, both subjected to earthquake excitations. To assess the capabilities of the Prandtl neural network under ideal situations, the data on the response of the frames have been obtained through the integration of their governing nonlinear equations of motion. The training has been based on the white noise while the strong earthquakes of 200% El Centro in 1940 and Gilroy have been used for testing. Results have shown the high precision of the Prandtl neural network in solving highly hysteretic problems. The issue is important for two main applications in structural dynamics and control: (1) analysis of highly nonlinear structures where it is desired to train a neural network to directly learn the behavior of a structure from experimental data; and (2) intelligent active control of structures where neural network emulators are designed to provide as precise predictions about the future response of the structures as possible, in order to be used in the determination of the required control forces. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...] [article] Dynamic analysis of nonlinear frames by prandtl neural networks [texte imprimé] / Abdolreza Joghataie, Auteur ; Mojtaba Farrokh, Auteur . - 2008 . - pp.961–969. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.961–969. Mots-clés : Neural  networks  Algorithms  Nonlinear  analysis  Hysteresis  Frames  Ground  motion  Dynamic  analysis Résumé : A new type of activation function, based on the use of the Prandtl–Ishlinskii operator, has been developed and used in the feed forward neural networks in order to improve their capabilities in learning to identify and analyze nonlinear structures subject to dynamic loading. The genetic algorithm has been used in its training. The neural network, which is referred to as the Prandtl neural network here, has been trained and used in the analysis of two shear frames, a single degree of freedom (SDOF) and a 3DOF, both subjected to earthquake excitations. To assess the capabilities of the Prandtl neural network under ideal situations, the data on the response of the frames have been obtained through the integration of their governing nonlinear equations of motion. The training has been based on the white noise while the strong earthquakes of 200% El Centro in 1940 and Gilroy have been used for testing. Results have shown the high precision of the Prandtl neural network in solving highly hysteretic problems. The issue is important for two main applications in structural dynamics and control: (1) analysis of highly nonlinear structures where it is desired to train a neural network to directly learn the behavior of a structure from experimental data; and (2) intelligent active control of structures where neural network emulators are designed to provide as precise predictions about the future response of the structures as possible, in order to be used in the determination of the required control forces. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...]

Application of centralized and decentralized control to building structure / Chin-Hsiung Loh in Journal of engineering mechanics, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.970–982. Titre : Application of centralized and decentralized control to building structure : Analytical study Type de document : texte imprimé Auteurs : Chin-Hsiung Loh, Auteur ; Chia-Ming Chang, Auteur Année de publication : 2008 Article en page(s) : pp.970–982. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Algorithms  Damping  Structural  control Résumé : This paper presents both the centralized and decentralized control strategies by using semiactive control devices (magnetorheological dampers) for building structural control under seismic excitations. The control algorithms used in this study only focus on the linear quadratic Gaussian control theory with acceleration measurements as feedback signals. In the centralized control, the control force is generated directly from the measurement in each degree of freedom, while in the decentralized control, only measurement from local subsystems is used to calculate the control force with respect to the locations of control devices and measurements. Four groups of centralized/decentralized control algorithms are studied: fully centralized control, fully decentralized control, half-centralized control, and partially decentralized control. The ASCE 20-story benchmark building is selected as an example to evaluate the control performance among different control strategies. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...] [article] Application of centralized and decentralized control to building structure : Analytical study [texte imprimé] / Chin-Hsiung Loh, Auteur ; Chia-Ming Chang, Auteur . - 2008 . - pp.970–982. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.970–982. Mots-clés : Algorithms  Damping  Structural  control Résumé : This paper presents both the centralized and decentralized control strategies by using semiactive control devices (magnetorheological dampers) for building structural control under seismic excitations. The control algorithms used in this study only focus on the linear quadratic Gaussian control theory with acceleration measurements as feedback signals. In the centralized control, the control force is generated directly from the measurement in each degree of freedom, while in the decentralized control, only measurement from local subsystems is used to calculate the control force with respect to the locations of control devices and measurements. Four groups of centralized/decentralized control algorithms are studied: fully centralized control, fully decentralized control, half-centralized control, and partially decentralized control. The ASCE 20-story benchmark building is selected as an example to evaluate the control performance among different control strategies. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...]

Nonlinear transient response of laminated composite shells / Namita Nanda in Journal of engineering mechanics, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.983–990. Titre : Nonlinear transient response of laminated composite shells Type de document : texte imprimé Auteurs : Namita Nanda, Auteur ; J. N. Bandyopadhyay, Auteur Année de publication : 2008 Article en page(s) : pp.983–990. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Transient  response  Laminates  Shells  Finite  element  method  Composite  materials Résumé : This paper first compares the writers’ results of static and dynamic analyses of plates, cylindrical and spherical shells employing four-, eight-, and nine-noded elements with different integration rules with those of earlier investigators and including some of the recent composite theories. Thereafter, the nonlinear transient responses of laminated composite cylindrical and spherical shell panels with cutouts are investigated taking up additional examples that are yet to appear in the published literature. For these, the finite-element model is employed using eight-noded C0 continuity, an isoparametric quadrilateral element considering von Karman large deflection assumptions. In the time integration, the Newmark average acceleration method is used in conjunction with a modified Newton–Raphson iteration scheme. Important conclusions with respect to nonlinear transient responses are summarized for cylindrical and spherical shells with and without cutouts. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...] [article] Nonlinear transient response of laminated composite shells [texte imprimé] / Namita Nanda, Auteur ; J. N. Bandyopadhyay, Auteur . - 2008 . - pp.983–990. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp.983–990. Mots-clés : Transient  response  Laminates  Shells  Finite  element  method  Composite  materials Résumé : This paper first compares the writers’ results of static and dynamic analyses of plates, cylindrical and spherical shells employing four-, eight-, and nine-noded elements with different integration rules with those of earlier investigators and including some of the recent composite theories. Thereafter, the nonlinear transient responses of laminated composite cylindrical and spherical shell panels with cutouts are investigated taking up additional examples that are yet to appear in the published literature. For these, the finite-element model is employed using eight-noded C0 continuity, an isoparametric quadrilateral element considering von Karman large deflection assumptions. In the time integration, the Newmark average acceleration method is used in conjunction with a modified Newton–Raphson iteration scheme. Important conclusions with respect to nonlinear transient responses are summarized for cylindrical and spherical shells with and without cutouts. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%289 [...]

Effect of seismic uplift pressure on the behavior of concrete gravity dams with a penetrated crack / Pekau, O. A. in Journal of engineering mechanics, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp. 991–999. Titre : Effect of seismic uplift pressure on the behavior of concrete gravity dams with a penetrated crack Type de document : texte imprimé Auteurs : Pekau, O. A., Auteur ; Zhu, Xueye, Auteur Année de publication : 2008 Article en page(s) : pp. 991–999. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Dams  gravity  Seismic  effects  Pressure  Cracking  Dam  safety Résumé : Proper consideration of the uplift pressure at the base of a concrete gravity dam is of great importance in practical engineering, since it is crucial to the safety of the dam, specifically for a cracked dam under seismic conditions. However, constant uplift pressure, which is suitable for the static case only, was adopted in almost all the seismic analyses of cracked concrete gravity dams. To adequately estimate the seismic behavior of cracked concrete gravity dams, a seismic uplift pressure model is proposed for a penetrated crack. In this model, the amount and the distribution of the uplift pressure along the assumed rigid crack walls are determined by the earthquake acceleration, the water heads, the aperture of the crack, and the opening/closing velocity. Application of the model to a typical concrete gravity dam with a penetrated crack at the base reveals that the seismic behavior of the dam is markedly affected by the seismic uplift pressure. In general, the residual downstream sliding is considerably enlarged compared to that of constant uplift pressure. Computations show that the seismic uplift pressure can be several times higher than the constant one, increasing the dynamic instability of the cracked dam. It is also revealed that the dynamic water flow plays the role of a wedge while the upper mouth of the crack is closing. When the dam rocks back to upstream, the uplift pressure increases until it is so high that the pivot at the toe is raised up and the whole dam loses its contact. Then the resultant uplift pressure remains constant until the dam is inclined to the upstream. During this period of time, the cracked dam is normally drifting towards the downstream due to the hydro pressure. ISSN : 0733-9399 En ligne : Dams, gravity, Seismic effects, Pressure, Crackinghttp://ascelibrary.org/doi/abs [...] [article] Effect of seismic uplift pressure on the behavior of concrete gravity dams with a penetrated crack [texte imprimé] / Pekau, O. A., Auteur ; Zhu, Xueye, Auteur . - 2008 . - pp. 991–999. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp. 991–999. Mots-clés : Dams  gravity  Seismic  effects  Pressure  Cracking  Dam  safety Résumé : Proper consideration of the uplift pressure at the base of a concrete gravity dam is of great importance in practical engineering, since it is crucial to the safety of the dam, specifically for a cracked dam under seismic conditions. However, constant uplift pressure, which is suitable for the static case only, was adopted in almost all the seismic analyses of cracked concrete gravity dams. To adequately estimate the seismic behavior of cracked concrete gravity dams, a seismic uplift pressure model is proposed for a penetrated crack. In this model, the amount and the distribution of the uplift pressure along the assumed rigid crack walls are determined by the earthquake acceleration, the water heads, the aperture of the crack, and the opening/closing velocity. Application of the model to a typical concrete gravity dam with a penetrated crack at the base reveals that the seismic behavior of the dam is markedly affected by the seismic uplift pressure. In general, the residual downstream sliding is considerably enlarged compared to that of constant uplift pressure. Computations show that the seismic uplift pressure can be several times higher than the constant one, increasing the dynamic instability of the cracked dam. It is also revealed that the dynamic water flow plays the role of a wedge while the upper mouth of the crack is closing. When the dam rocks back to upstream, the uplift pressure increases until it is so high that the pivot at the toe is raised up and the whole dam loses its contact. Then the resultant uplift pressure remains constant until the dam is inclined to the upstream. During this period of time, the cracked dam is normally drifting towards the downstream due to the hydro pressure. ISSN : 0733-9399 En ligne : Dams, gravity, Seismic effects, Pressure, Crackinghttp://ascelibrary.org/doi/abs [...]

Damage diagnosis of frame structures using modified modal strain energy change method / Ting-Yu Hsu in Journal of engineering mechanics, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp. 1000–1012. Titre : Damage diagnosis of frame structures using modified modal strain energy change method Type de document : texte imprimé Auteurs : Ting-Yu Hsu, Auteur ; Chin-Hsiung Loh, Auteur Année de publication : 2008 Article en page(s) : pp. 1000–1012. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Damage  Structural  dynamics  Strain  energy  Three-dimensional  analysis  Framed  structures Résumé : This work presents a modified modal strain energy change (M-MSEC) method and its corresponding iteration process to detect damage to frame structures. Analytical results of a three-dimensional frame structure demonstrate that the quantity of damage can be identified correctly by using different modes in the M-MSEC method. A full-scale experimental study is also performed to evaluate the robustness of the M-MSEC method on damage detection as well as damage quantification. Satisfactory results are shown in relation to the modeling error, noise effect, and limited measurements. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%281 [...] [article] Damage diagnosis of frame structures using modified modal strain energy change method [texte imprimé] / Ting-Yu Hsu, Auteur ; Chin-Hsiung Loh, Auteur . - 2008 . - pp. 1000–1012. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°11 (Novembre 2008) . - pp. 1000–1012. Mots-clés : Damage  Structural  dynamics  Strain  energy  Three-dimensional  analysis  Framed  structures Résumé : This work presents a modified modal strain energy change (M-MSEC) method and its corresponding iteration process to detect damage to frame structures. Analytical results of a three-dimensional frame structure demonstrate that the quantity of damage can be identified correctly by using different modes in the M-MSEC method. A full-scale experimental study is also performed to evaluate the robustness of the M-MSEC method on damage detection as well as damage quantification. Satisfactory results are shown in relation to the modeling error, noise effect, and limited measurements. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A11%281 [...]

Exemplaires

Bibliothèque Ecole Nationale Polytechnique d'Alger

Accueil

Se connecter

Météo

Adresse