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Ajouter le résultat dans votre panierTransverse shear including skin effect for composite sandwich with honeycomb sinusoidal core / An Chen in Journal of engineering mechanics, Vol. 133 N°3 (Mars 2007)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.247–256.
Titre : Transverse shear including skin effect for composite sandwich with honeycomb sinusoidal core Type de document : texte imprimé Auteurs : An Chen, Auteur ; Julio F. Davalos, Auteur Année de publication : 2007 Article en page(s) : pp.247–256. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Fiber reinforced polymers, Sandwich structures, Honeycomb structure Skin friction Stress distribution Finite element method Parameters Résumé : Honeycomb fiber-reinforced polymer (HFRP) sandwich panels with sinusoidal core geometry have been used extensively for new construction and replacement of bridge decks. The core geometry used consists of large cavities and represents a new type of core configuration. This study is concerned with the behavior of HFRP panels under transverse shear considering skin effect, and addresses the two contributing factors due to shear warping and bending warping. Shear warping corresponds to the assumption of having a hinge connection between facesheet and core, and bending warping is induced for the assumption of a rigid connection. All previous studies have been focused mainly on shear warping, neglecting for the most part bending warping. A closed-form solution based on proper description of displacement field at the interface is derived considering shear warping. The accuracy of this solution is verified by finite-element (FE) results. The FE model is then applied to study bending warping effect, and also the core-facesheet constraint or interface bonding effect. The equivalent shear stiffness and the stress distributions subject to skin effect are defined, and suggestions for future design considerations are given. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=247&volume=133&issue=3&journalCo [...] [article] Transverse shear including skin effect for composite sandwich with honeycomb sinusoidal core [texte imprimé] / An Chen, Auteur ; Julio F. Davalos, Auteur . - 2007 . - pp.247–256.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.247–256.
Mots-clés : Fiber reinforced polymers, Sandwich structures, Honeycomb structure Skin friction Stress distribution Finite element method Parameters Résumé : Honeycomb fiber-reinforced polymer (HFRP) sandwich panels with sinusoidal core geometry have been used extensively for new construction and replacement of bridge decks. The core geometry used consists of large cavities and represents a new type of core configuration. This study is concerned with the behavior of HFRP panels under transverse shear considering skin effect, and addresses the two contributing factors due to shear warping and bending warping. Shear warping corresponds to the assumption of having a hinge connection between facesheet and core, and bending warping is induced for the assumption of a rigid connection. All previous studies have been focused mainly on shear warping, neglecting for the most part bending warping. A closed-form solution based on proper description of displacement field at the interface is derived considering shear warping. The accuracy of this solution is verified by finite-element (FE) results. The FE model is then applied to study bending warping effect, and also the core-facesheet constraint or interface bonding effect. The equivalent shear stiffness and the stress distributions subject to skin effect are defined, and suggestions for future design considerations are given. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=247&volume=133&issue=3&journalCo [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.257–266.
Titre : Global constitutive model for reinforced concrete plates Type de document : texte imprimé Auteurs : Pierre Koechlin, Auteur ; Serguei Potapov, Auteur Année de publication : 2007 Article en page(s) : pp.257–266. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Concrete reinforced Concrete slabs Bending Constitutive models Plates Résumé : A new constitutive model for reinforced concrete plates using global variables is discussed in this work. It includes the modeling of concrete cracking (through damage) and the plastic yielding of steel. The yield surface, derived from limit analysis, generalizes the Johansen’s criterion by taking into account both membrane and bending behaviors in reinforced concrete plates. Compared to three-dimensional models, this stress resultant model gives reliable results and can be applied to the study of large shell structures. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2825 [...] [article] Global constitutive model for reinforced concrete plates [texte imprimé] / Pierre Koechlin, Auteur ; Serguei Potapov, Auteur . - 2007 . - pp.257–266.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.257–266.
Mots-clés : Concrete reinforced Concrete slabs Bending Constitutive models Plates Résumé : A new constitutive model for reinforced concrete plates using global variables is discussed in this work. It includes the modeling of concrete cracking (through damage) and the plastic yielding of steel. The yield surface, derived from limit analysis, generalizes the Johansen’s criterion by taking into account both membrane and bending behaviors in reinforced concrete plates. Compared to three-dimensional models, this stress resultant model gives reliable results and can be applied to the study of large shell structures. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2825 [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.267–277.
Titre : Hydrostatic, temperature, time-displacement model for concrete dams Type de document : texte imprimé Auteurs : Pierre Léger, Auteur ; Martin Leclerc, Auteur Année de publication : 2007 Article en page(s) : pp.267–277. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Dams concrete Thermal factors Heat transfer Displacement Instrumentation Résumé : This paper presents frequency domain solution algorithms of the one-dimensional transient heat transfer equation that describes temperature variations in arch dam cross sections. Algorithms are developed to compute the temperature T(x,t) , spatial distribution, and time evolution for the “direct” problem, where the temperature variations are specified at the upstream and downstream faces, and for the “inverse” problem, where temperatures have been measured at thermometers located inside instrumented dam sections. The resulting nonlinear temperature field is decomposed in an effective average temperature, Tm(t) , and a linear temperature difference, Tg(x,t) , from which the dam thermal displacement response can be deducted. The proposed frequency domain solution procedures are able to reproduce an arbitrary transient heat response by appending trailing temperatures at the end of thermal signals, thus transforming a periodic heat transfer problem in a transient one. The frequency domain solution procedures are used to develop the HTT (hydrostatic, temperature, time) statistical model to interpret concrete dam-recorded pendulum displacements. In the HTT model, the thermal loads are arbitrary and can contain temperature drift or unusual temperature conditions. The explicit use of Tm(t) and Tg(x,t) in the HTT dam displacement model allows extrapolation for temperature conditions that have never been experienced by the dam before (within the assumption of elastic behavior). The HTT model is applied to the 131-m-high Schlegeis arch dam, and the results are compared with the HST (hydrostatic, seasonal, time) displacement model that is widely used in practice. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2826 [...] [article] Hydrostatic, temperature, time-displacement model for concrete dams [texte imprimé] / Pierre Léger, Auteur ; Martin Leclerc, Auteur . - 2007 . - pp.267–277.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.267–277.
Mots-clés : Dams concrete Thermal factors Heat transfer Displacement Instrumentation Résumé : This paper presents frequency domain solution algorithms of the one-dimensional transient heat transfer equation that describes temperature variations in arch dam cross sections. Algorithms are developed to compute the temperature T(x,t) , spatial distribution, and time evolution for the “direct” problem, where the temperature variations are specified at the upstream and downstream faces, and for the “inverse” problem, where temperatures have been measured at thermometers located inside instrumented dam sections. The resulting nonlinear temperature field is decomposed in an effective average temperature, Tm(t) , and a linear temperature difference, Tg(x,t) , from which the dam thermal displacement response can be deducted. The proposed frequency domain solution procedures are able to reproduce an arbitrary transient heat response by appending trailing temperatures at the end of thermal signals, thus transforming a periodic heat transfer problem in a transient one. The frequency domain solution procedures are used to develop the HTT (hydrostatic, temperature, time) statistical model to interpret concrete dam-recorded pendulum displacements. In the HTT model, the thermal loads are arbitrary and can contain temperature drift or unusual temperature conditions. The explicit use of Tm(t) and Tg(x,t) in the HTT dam displacement model allows extrapolation for temperature conditions that have never been experienced by the dam before (within the assumption of elastic behavior). The HTT model is applied to the 131-m-high Schlegeis arch dam, and the results are compared with the HST (hydrostatic, seasonal, time) displacement model that is widely used in practice. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2826 [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.278–289.
Titre : Response spectral density for oscillators with nonlinear damping Type de document : texte imprimé Auteurs : F. Rudinger, Auteur Année de publication : 2007 Article en page(s) : pp.278–289. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Damping White noise Power spectral density Oscillations Résumé : The concept of equivalent nonlinearization is used to obtain approximate solutions for the frequency response function and power spectral density (PSD) function of the response for oscillators with nonlinear damping. When harmonic excitation is considered the energy of the response is assumed to oscillate around a mean energy level. Assuming that the response is harmonic with energy-dependent amplitude an approximate frequency response function is obtained. The PSD function of the response to white noise excitation at a given energy level is obtained by an expression similar to the expression for a linear system, where the damping is replaced by an energy-dependent damping function. The total PSD function is obtained as a weighted average of the damping at all energy levels, and the method can be considered an extension of the method of equivalent nonlinearization to the frequency domain. The accuracy of the methods is verified by numerical examples. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2827 [...] [article] Response spectral density for oscillators with nonlinear damping [texte imprimé] / F. Rudinger, Auteur . - 2007 . - pp.278–289.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.278–289.
Mots-clés : Damping White noise Power spectral density Oscillations Résumé : The concept of equivalent nonlinearization is used to obtain approximate solutions for the frequency response function and power spectral density (PSD) function of the response for oscillators with nonlinear damping. When harmonic excitation is considered the energy of the response is assumed to oscillate around a mean energy level. Assuming that the response is harmonic with energy-dependent amplitude an approximate frequency response function is obtained. The PSD function of the response to white noise excitation at a given energy level is obtained by an expression similar to the expression for a linear system, where the damping is replaced by an energy-dependent damping function. The total PSD function is obtained as a weighted average of the damping at all energy levels, and the method can be considered an extension of the method of equivalent nonlinearization to the frequency domain. The accuracy of the methods is verified by numerical examples. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2827 [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.290–298.
Titre : Semiactive connected control method for adjacent multidegree-of-freedom buildings Type de document : texte imprimé Auteurs : Richard E. Christenson, Auteur ; B. F. Spencer, Auteur ; Johnson, Erik A., Auteur Année de publication : 2007 Article en page(s) : pp.290–298. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Buildings Structural control Seismic analysis Résumé : The connected control method (CCM) has been shown previously to be a viable means to protect adjacent flexible structures. The CCM works by using an auxiliary structure to provide a reaction force for control. The CCM can be applied to a variety of structural systems including civil, mechanical, or aerospace structures, and can incorporate various types of control strategies including passive, active, or semiactive control. This paper focuses on the application of the CCM to seismically excited adjacent buildings employing semiactive control and extends the previous research in semiactive coupled building control to examine the effects of relative building height and coupling link location on the semiactive performance. The optimal semiactive coupled building configuration is shown to follow two guidelines: (1) The dominant frequencies of the two coupled buildings do not coincide and (2) the coupling link is not placed at the node of a dominant vibratory mode. Additionally, it is shown that semiactive control is able to achieve performance similar to the optimal passive control at a fraction of the required control device force. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2829 [...] [article] Semiactive connected control method for adjacent multidegree-of-freedom buildings [texte imprimé] / Richard E. Christenson, Auteur ; B. F. Spencer, Auteur ; Johnson, Erik A., Auteur . - 2007 . - pp.290–298.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.290–298.
Mots-clés : Buildings Structural control Seismic analysis Résumé : The connected control method (CCM) has been shown previously to be a viable means to protect adjacent flexible structures. The CCM works by using an auxiliary structure to provide a reaction force for control. The CCM can be applied to a variety of structural systems including civil, mechanical, or aerospace structures, and can incorporate various types of control strategies including passive, active, or semiactive control. This paper focuses on the application of the CCM to seismically excited adjacent buildings employing semiactive control and extends the previous research in semiactive coupled building control to examine the effects of relative building height and coupling link location on the semiactive performance. The optimal semiactive coupled building configuration is shown to follow two guidelines: (1) The dominant frequencies of the two coupled buildings do not coincide and (2) the coupling link is not placed at the node of a dominant vibratory mode. Additionally, it is shown that semiactive control is able to achieve performance similar to the optimal passive control at a fraction of the required control device force. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2829 [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.299–307.
Titre : Computer modeling for a generalized approach to measure impact damage Type de document : texte imprimé Auteurs : Octavio Melchor-Lucero, Auteur ; Cesar J. Carrasco, Auteur ; Luis Espino, Auteur Année de publication : 2007 Article en page(s) : pp.299–307. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Projectiles Simulation Damage Neural networks Computer models Résumé : This paper describes a generalized and rational computational approach to qualitatively measure the level of damage generated by projectiles impacting a system of bumper plates. A single impact damage index (SIDI) model is proposed based on results from numerical simulations using a hydrocode. The model combines the depth of penetration and the size of the holes. A sensitivity study demonstrated that the SIDI is very useful to make relative comparisons between a wide range of impact configurations, high impact velocities, material densities, and projectile shapes and sizes. Additional simulations with two neighbor impacts were conducted to compute a combined damage index and study its sensitivity to neighboring distances. An artificial neural network was developed to rapidly estimate the SIDI for numerous impact configurations and velocities. The approach can be coupled with other methodologies to assess larger-scale damage involving multiple impacts at high velocities. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2829 [...] [article] Computer modeling for a generalized approach to measure impact damage [texte imprimé] / Octavio Melchor-Lucero, Auteur ; Cesar J. Carrasco, Auteur ; Luis Espino, Auteur . - 2007 . - pp.299–307.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.299–307.
Mots-clés : Projectiles Simulation Damage Neural networks Computer models Résumé : This paper describes a generalized and rational computational approach to qualitatively measure the level of damage generated by projectiles impacting a system of bumper plates. A single impact damage index (SIDI) model is proposed based on results from numerical simulations using a hydrocode. The model combines the depth of penetration and the size of the holes. A sensitivity study demonstrated that the SIDI is very useful to make relative comparisons between a wide range of impact configurations, high impact velocities, material densities, and projectile shapes and sizes. Additional simulations with two neighbor impacts were conducted to compute a combined damage index and study its sensitivity to neighboring distances. An artificial neural network was developed to rapidly estimate the SIDI for numerous impact configurations and velocities. The approach can be coupled with other methodologies to assess larger-scale damage involving multiple impacts at high velocities. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2829 [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.308–319.
Titre : Mechanics of progressive collapse : learning from world trade center and building demolitions Type de document : texte imprimé Auteurs : Zdenek P. Bazant, Auteur ; Mathieu Verdure, Auteur Année de publication : 2007 Article en page(s) : pp.308–319. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Buildings high-rise Progressive collapse Demolition New York Terrorism Failure Fracture Structural dynamics Energy methods Résumé : Progressive collapse is a failure mode of great concern for tall buildings, and is also typical of building demolitions. The most infamous paradigm is the collapse of the World Trade Center towers. After reviewing the mechanics of their collapse, the motion during the crushing of one floor (or group of floors) and its energetics are analyzed, and a dynamic one-dimensional continuum model of progressive collapse is developed. Rather than using classical homogenization, it is found more effective to characterize the continuum by an energetically equivalent snap-through. The collapse, in which two phases—crush-down followed by crush-up—must be distinguished, is described in each phase by a nonlinear second-order differential equation for the propagation of the crushing front of a compacted block of accreting mass. Expressions for consistent energy potentials are formulated and an exact analytical solution of a special case is given. It is shown that progressive collapse will be triggered if the total (internal) energy loss during the crushing of one story (equal to the energy dissipated by the complete crushing and compaction of one story, minus the loss of gravity potential during the crushing of that story) exceeds the kinetic energy impacted to that story. Regardless of the load capacity of the columns, there is no way to deny the inevitability of progressive collapse driven by gravity alone if this criterion is satisfied (for the World Trade Center it is satisfied with an order-of-magnitude margin). The parameters are the compaction ratio of a crushed story, the fracture of mass ejected outside the tower perimeter, and the energy dissipation per unit height. The last is the most important, yet the hardest to predict theoretically. It is argued that, using inverse analysis, one could identify these parameters from a precise record of the motion of floors of a collapsing building. Due to a shroud of dust and smoke, the videos of the World Trade Center are only of limited use. It is proposed to obtain such records by monitoring (with millisecond accuracy) the precise time history of displacements in different modes of building demolitions. The monitoring could be accomplished by real-time telemetry from sacrificial accelerometers, or by high-speed optical camera. The resulting information on energy absorption capability would be valuable for the rating of various structural systems and for inferring their collapse mode under extreme fire, internal explosion, external blast, impact or other kinds of terrorist attack, as well as earthquake and foundation movements. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2830 [...] [article] Mechanics of progressive collapse : learning from world trade center and building demolitions [texte imprimé] / Zdenek P. Bazant, Auteur ; Mathieu Verdure, Auteur . - 2007 . - pp.308–319.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.308–319.
Mots-clés : Buildings high-rise Progressive collapse Demolition New York Terrorism Failure Fracture Structural dynamics Energy methods Résumé : Progressive collapse is a failure mode of great concern for tall buildings, and is also typical of building demolitions. The most infamous paradigm is the collapse of the World Trade Center towers. After reviewing the mechanics of their collapse, the motion during the crushing of one floor (or group of floors) and its energetics are analyzed, and a dynamic one-dimensional continuum model of progressive collapse is developed. Rather than using classical homogenization, it is found more effective to characterize the continuum by an energetically equivalent snap-through. The collapse, in which two phases—crush-down followed by crush-up—must be distinguished, is described in each phase by a nonlinear second-order differential equation for the propagation of the crushing front of a compacted block of accreting mass. Expressions for consistent energy potentials are formulated and an exact analytical solution of a special case is given. It is shown that progressive collapse will be triggered if the total (internal) energy loss during the crushing of one story (equal to the energy dissipated by the complete crushing and compaction of one story, minus the loss of gravity potential during the crushing of that story) exceeds the kinetic energy impacted to that story. Regardless of the load capacity of the columns, there is no way to deny the inevitability of progressive collapse driven by gravity alone if this criterion is satisfied (for the World Trade Center it is satisfied with an order-of-magnitude margin). The parameters are the compaction ratio of a crushed story, the fracture of mass ejected outside the tower perimeter, and the energy dissipation per unit height. The last is the most important, yet the hardest to predict theoretically. It is argued that, using inverse analysis, one could identify these parameters from a precise record of the motion of floors of a collapsing building. Due to a shroud of dust and smoke, the videos of the World Trade Center are only of limited use. It is proposed to obtain such records by monitoring (with millisecond accuracy) the precise time history of displacements in different modes of building demolitions. The monitoring could be accomplished by real-time telemetry from sacrificial accelerometers, or by high-speed optical camera. The resulting information on energy absorption capability would be valuable for the rating of various structural systems and for inferring their collapse mode under extreme fire, internal explosion, external blast, impact or other kinds of terrorist attack, as well as earthquake and foundation movements. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2830 [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.326–337.
Titre : Vertical vibration of a flexible plate with rigid core on saturated ground Type de document : texte imprimé Auteurs : S. L. Chen, Auteur ; L. Z. Chen, Auteur ; E. Pan, Auteur Année de publication : 2007 Article en page(s) : pp.326–337. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Saturated soils Vibration Plates Résumé : In this paper, the vertical vibration of a flexible plate with rigid core resting on a semi-infinite saturated soil is studied analytically. The behavior of the soil is assumed to follow Biot’s poroelastodynamic theory with compressible soil skeleton and pore water, and the response of the time-harmonic excited plate is governed by the classical thin-plate theory. By virtue of the Hankel transform technique, the fundamental solutions of the skeleton displacements, stresses, and pore pressure are derived, and a set of dual integral equations associated with the relaxed boundary and completely drained condition at the soil-foundation contact interface are also developed. These governing integral equations are further reduced to the standard Fredholm integral equations of the second kind and solved by numerical procedures. Comparison with existing solutions for a rigid permeable plate on saturated soil confirms the accuracy of the present solution. Selected numerical results are presented to show the influence of the permeability, the size of the rigid core, and the plate flexibility on the dynamic interaction between the elastic plate with rigid core and the underlying saturated soil. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2832 [...] [article] Vertical vibration of a flexible plate with rigid core on saturated ground [texte imprimé] / S. L. Chen, Auteur ; L. Z. Chen, Auteur ; E. Pan, Auteur . - 2007 . - pp.326–337.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.326–337.
Mots-clés : Saturated soils Vibration Plates Résumé : In this paper, the vertical vibration of a flexible plate with rigid core resting on a semi-infinite saturated soil is studied analytically. The behavior of the soil is assumed to follow Biot’s poroelastodynamic theory with compressible soil skeleton and pore water, and the response of the time-harmonic excited plate is governed by the classical thin-plate theory. By virtue of the Hankel transform technique, the fundamental solutions of the skeleton displacements, stresses, and pore pressure are derived, and a set of dual integral equations associated with the relaxed boundary and completely drained condition at the soil-foundation contact interface are also developed. These governing integral equations are further reduced to the standard Fredholm integral equations of the second kind and solved by numerical procedures. Comparison with existing solutions for a rigid permeable plate on saturated soil confirms the accuracy of the present solution. Selected numerical results are presented to show the influence of the permeability, the size of the rigid core, and the plate flexibility on the dynamic interaction between the elastic plate with rigid core and the underlying saturated soil. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2832 [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.338–347.
Titre : Inclusion of some aspects of chemical behavior of unsaturated soil in thermo/hydro/chemical/mechanical models. I : model development Type de document : texte imprimé Auteurs : P. J. Cleall, Auteur ; S. C. Seetharam, Auteur ; H. R. Thomas, Auteur Année de publication : 2007 Article en page(s) : pp.338–347. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Unsaturated soils, Numerical models, Soil deformation, Bentonite Nuclear wastes Chemical equilibrium Transport phenomena Résumé : This paper presents an investigation of the inclusion of some aspects of chemical behavior within a model of coupled thermo/hydro/chemical/mechanical behavior of unsaturated soils. In particular, multicomponent reactive chemical transport behavior is addressed. The chemical transport model is based on the advection/dispersion/reaction equation, while geochemical reactions are considered via coupling with an established geochemical speciation model. A numerical solution of the governing differential equations is achieved by the use of the Galerkin-weighted residual method for spatial discretization and an implicit backward Eulerian finite-difference method for temporal discretization. The solution of the geochemical reactions is achieved externally to the main solution procedure. Coupling between the chemical transport and geochemical models is achieved via the implementation of both sequential iterative and sequential noniterative techniques. Three application problems are then presented to demonstrate the capability of the coupled model. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2833 [...] [article] Inclusion of some aspects of chemical behavior of unsaturated soil in thermo/hydro/chemical/mechanical models. I : model development [texte imprimé] / P. J. Cleall, Auteur ; S. C. Seetharam, Auteur ; H. R. Thomas, Auteur . - 2007 . - pp.338–347.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.338–347.
Mots-clés : Unsaturated soils, Numerical models, Soil deformation, Bentonite Nuclear wastes Chemical equilibrium Transport phenomena Résumé : This paper presents an investigation of the inclusion of some aspects of chemical behavior within a model of coupled thermo/hydro/chemical/mechanical behavior of unsaturated soils. In particular, multicomponent reactive chemical transport behavior is addressed. The chemical transport model is based on the advection/dispersion/reaction equation, while geochemical reactions are considered via coupling with an established geochemical speciation model. A numerical solution of the governing differential equations is achieved by the use of the Galerkin-weighted residual method for spatial discretization and an implicit backward Eulerian finite-difference method for temporal discretization. The solution of the geochemical reactions is achieved externally to the main solution procedure. Coupling between the chemical transport and geochemical models is achieved via the implementation of both sequential iterative and sequential noniterative techniques. Three application problems are then presented to demonstrate the capability of the coupled model. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2833 [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.348–356.
Titre : Inclusion of some aspects of chemical behavior of unsaturated soil in thermo/hydro/chemical/mechanical models. II : application and transport of soluble salts in compacted bentonite Type de document : texte imprimé Auteurs : P. J. Cleall, Auteur ; S. C. Seetharam, Auteur ; H. R. Thomas, Auteur Année de publication : 2007 Article en page(s) : pp.348–356. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Unsaturated soils Numerical models Soil deformation Nuclear wastes Chemical equilibrium Transport phenomena Résumé : This paper presents an application of a coupled thermo/hydro/chemical/mechanical model via simulation of a laboratory experiment in order to investigate the transport behavior of ions in bentonite pore water. Chemical reactions considered include ion exchange reactions involving major cations ( Na+ , K+ , Mg2+ , and Ca2+ ) and precipitation-dissolution of trace minerals (calcite, dolomite, anhydrite, and halite). The following conclusions are drawn based on the numerical results. The development of both the temperature and moisture fields was captured by simulation, and a good correlation with the experimental water uptake results was observed. For all ions, the model showed a good qualitative and reasonable quantitative agreement with the experimental results. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2834 [...] [article] Inclusion of some aspects of chemical behavior of unsaturated soil in thermo/hydro/chemical/mechanical models. II : application and transport of soluble salts in compacted bentonite [texte imprimé] / P. J. Cleall, Auteur ; S. C. Seetharam, Auteur ; H. R. Thomas, Auteur . - 2007 . - pp.348–356.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.348–356.
Mots-clés : Unsaturated soils Numerical models Soil deformation Nuclear wastes Chemical equilibrium Transport phenomena Résumé : This paper presents an application of a coupled thermo/hydro/chemical/mechanical model via simulation of a laboratory experiment in order to investigate the transport behavior of ions in bentonite pore water. Chemical reactions considered include ion exchange reactions involving major cations ( Na+ , K+ , Mg2+ , and Ca2+ ) and precipitation-dissolution of trace minerals (calcite, dolomite, anhydrite, and halite). The following conclusions are drawn based on the numerical results. The development of both the temperature and moisture fields was captured by simulation, and a good correlation with the experimental water uptake results was observed. For all ions, the model showed a good qualitative and reasonable quantitative agreement with the experimental results. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2834 [...]
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.357–366.
Titre : Dynamic analysis of multilayered soils to water waves and flow Type de document : texte imprimé Auteurs : Ping-Cheng Hsieh, Auteur ; Wen-Po Hsieh, Auteur Année de publication : 2007 Article en page(s) : pp.357–366. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Water waves Viscoelasticity Seepage Multimedia Résumé : In nature, a soil profile generally consists of several heterogeneous layers. This study is aimed at discussing the interactive problem of oscillatory water waves and flow passing over multilayered soils. The soil behavior is considered as viscoelastic in the present mathematical model modified from Biot’s poroelastic theory. Employing this model, the dynamic response including the profiles of pore water pressure and effective stress in the multilayered soils is discussed. The results reveal that the perturbed pore pressure is different from that inside a single-layered soil where the thickness of the first soil layer is less than the water wavelength. The discrepancy of the vertical effective stresses between multilayered and single-layered soils is even much more apparent under the same conditions. Moreover, seepage force is examined and is found to be larger near the bed surface and the bottom of the first soil layer where soils are easily disturbed by external disturbance. The locations where soil failure might happen are found near the troughs of surface water waves. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2835 [...] [article] Dynamic analysis of multilayered soils to water waves and flow [texte imprimé] / Ping-Cheng Hsieh, Auteur ; Wen-Po Hsieh, Auteur . - 2007 . - pp.357–366.
Applied mechanics
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.357–366.
Mots-clés : Water waves Viscoelasticity Seepage Multimedia Résumé : In nature, a soil profile generally consists of several heterogeneous layers. This study is aimed at discussing the interactive problem of oscillatory water waves and flow passing over multilayered soils. The soil behavior is considered as viscoelastic in the present mathematical model modified from Biot’s poroelastic theory. Employing this model, the dynamic response including the profiles of pore water pressure and effective stress in the multilayered soils is discussed. The results reveal that the perturbed pore pressure is different from that inside a single-layered soil where the thickness of the first soil layer is less than the water wavelength. The discrepancy of the vertical effective stresses between multilayered and single-layered soils is even much more apparent under the same conditions. Moreover, seepage force is examined and is found to be larger near the bed surface and the bottom of the first soil layer where soils are easily disturbed by external disturbance. The locations where soil failure might happen are found near the troughs of surface water waves. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2835 [...]
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