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Ajouter le résultat dans votre panierNon-structure-specific intensity measure parameters and characteristic period of near-fault ground motions / Dixiong Yang in Earthquake engineering structural dynamics, Vol. 38 N° 11 (Septembre 2009)
inEarthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1257-1280
Titre : Non-structure-specific intensity measure parameters and characteristic period of near-fault ground motions Type de document : texte imprimé Auteurs : Dixiong Yang, Auteur ; Jianwei Pan Gang Li, Auteur Article en page(s) : pp. 1257-1280 Langues : Anglais (eng) Mots-clés : Near-fault ground motions Long-period pulse Intensity measure parameters Characteristic period Bilinear SDOF systems Correlation analysis Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper focuses on the effects of long-period pulse of near-fault ground motions on the structural damage potential. Two sets of near-fault ground motion records from Chi-Chi, Taiwan earthquake and Northridge earthquake with and without distinct pulse are selected as the input, and the correlation analysis between 30 non-structure-specific intensity measure parameters and maximum inelastic displacements and energy responses (input energy and hysteretic energy) of bilinear single degree of freedom systems are conducted. Based on the frequency characteristic of near-fault ground motions with remarkable long-period components, two intensity indices are proposed, namely, the improved effective peak acceleration (IEPA) and improved effective peak velocity (IEPV). In addition a new characteristic period of these ground motions is defined based on IEPA and IEPV. Numerical results illustrate that the intensity measure parameters related to ground acceleration present the best correlation with the seismic responses for rigid systems; the velocity-related and displacement-related parameters are better for medium-frequency systems and flexible systems, respectively. The correlation curves of near-fault ground motions with velocity pulse differ from those of ground motions without pulse. Moreover, the improved parameters IEPA and IEPV of near-fault impulsive ground motions enhance the performance of intensity measure of corresponding conventional parameters, i.e. EPA and EPV. The new characteristic period based on IEPA and IEPV can better reflect the frequency content of near-fault ground motions. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Non-structure-specific intensity measure parameters and characteristic period of near-fault ground motions [texte imprimé] / Dixiong Yang, Auteur ; Jianwei Pan Gang Li, Auteur . - pp. 1257-1280.
Langues : Anglais (eng)
in Earthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1257-1280
Mots-clés : Near-fault ground motions Long-period pulse Intensity measure parameters Characteristic period Bilinear SDOF systems Correlation analysis Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper focuses on the effects of long-period pulse of near-fault ground motions on the structural damage potential. Two sets of near-fault ground motion records from Chi-Chi, Taiwan earthquake and Northridge earthquake with and without distinct pulse are selected as the input, and the correlation analysis between 30 non-structure-specific intensity measure parameters and maximum inelastic displacements and energy responses (input energy and hysteretic energy) of bilinear single degree of freedom systems are conducted. Based on the frequency characteristic of near-fault ground motions with remarkable long-period components, two intensity indices are proposed, namely, the improved effective peak acceleration (IEPA) and improved effective peak velocity (IEPV). In addition a new characteristic period of these ground motions is defined based on IEPA and IEPV. Numerical results illustrate that the intensity measure parameters related to ground acceleration present the best correlation with the seismic responses for rigid systems; the velocity-related and displacement-related parameters are better for medium-frequency systems and flexible systems, respectively. The correlation curves of near-fault ground motions with velocity pulse differ from those of ground motions without pulse. Moreover, the improved parameters IEPA and IEPV of near-fault impulsive ground motions enhance the performance of intensity measure of corresponding conventional parameters, i.e. EPA and EPV. The new characteristic period based on IEPA and IEPV can better reflect the frequency content of near-fault ground motions. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe Exemplaires
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inEarthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1281-1305
Titre : A model for the 3D kinematic interaction analysis of pile groups in layered soils Type de document : texte imprimé Auteurs : Dezi Francesca, Auteur ; Sandro Carbonari, Auteur ; Leoni Graziano, Auteur Article en page(s) : pp. 1281-1305 Langues : Anglais (eng) Mots-clés : Dynamics Frequency domain Kinematic interaction Impedances Numerical modelling Pile groups Soil-structure Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The paper presents a numerical model for the analysis of the soil-structure kinematic interaction of single piles and pile groups embedded in layered soil deposits during seismic actions. A finite element model is considered for the pile group and the soil is assumed to be a Winkler-type medium. The pile-soil-pile interaction and the radiation problem are accounted for by means of elastodynamic Green's functions. Condensation of the problem permits a consistent and straightforward derivation of both the impedance functions and the foundation input motion, which are necessary to perform the inertial soil-structure interaction analyses. The model proposed allows calculating the internal forces induced by soil-pile and pile-to-pile interactions. Comparisons with data available in literature are made to study the convergence and validate the model. An application to a realistic pile foundation is given to demonstrate the potential of the model to catch the dynamic behaviour of the soil-foundation system and the stress resultants in each pile. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] A model for the 3D kinematic interaction analysis of pile groups in layered soils [texte imprimé] / Dezi Francesca, Auteur ; Sandro Carbonari, Auteur ; Leoni Graziano, Auteur . - pp. 1281-1305.
Langues : Anglais (eng)
in Earthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1281-1305
Mots-clés : Dynamics Frequency domain Kinematic interaction Impedances Numerical modelling Pile groups Soil-structure Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The paper presents a numerical model for the analysis of the soil-structure kinematic interaction of single piles and pile groups embedded in layered soil deposits during seismic actions. A finite element model is considered for the pile group and the soil is assumed to be a Winkler-type medium. The pile-soil-pile interaction and the radiation problem are accounted for by means of elastodynamic Green's functions. Condensation of the problem permits a consistent and straightforward derivation of both the impedance functions and the foundation input motion, which are necessary to perform the inertial soil-structure interaction analyses. The model proposed allows calculating the internal forces induced by soil-pile and pile-to-pile interactions. Comparisons with data available in literature are made to study the convergence and validate the model. An application to a realistic pile foundation is given to demonstrate the potential of the model to catch the dynamic behaviour of the soil-foundation system and the stress resultants in each pile. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe Exemplaires
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inEarthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1307-1333
Titre : Experimental and analytical study on pounding reduction of base-isolated highway bridges using MR dampers Type de document : texte imprimé Auteurs : Guo Anxin, Auteur ; Li Zhongjun, Auteur ; Li, Hui, Auteur Article en page(s) : pp. 1307-1333 Langues : Anglais (eng) Mots-clés : Pounding Highway bridge Shaking table test Semiactive control MR damper Seismic response Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Pounding between adjacent superstructures has been a major cause of highway bridge damage in the past several earthquakes. This paper presents an experimental and analytical study on pounding reduction of highway bridges subjected to earthquake ground motions by using magnetorheological (MR) dampers. An analytical model, which incorporates structural pounding and MR dampers, is developed. A series of shaking table tests on a 1:20 scaled base-isolated bridge model are performed to investigate the effects of pounding between adjacent superstructures on the dynamics of the structures. Based on the test results, the parameters of the linear and the nonlinear viscoelastic impact models are identified. Performance of the semiactive system for reducing structural pounding is also investigated experimentally, in which the MR dampers are used in conjunction with the proposed control strategy, to verify the effectiveness of the MR dampers. Structural responses are also simulated by using the established analytical model and compared with the shaking table test results. The results show that pounding between adjacent superstructures of the highway bridge significantly increases the structural acceleration responses. For the base-isolated bridge model considered here, the semiactive control system with MR dampers effectively precludes pounding. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Experimental and analytical study on pounding reduction of base-isolated highway bridges using MR dampers [texte imprimé] / Guo Anxin, Auteur ; Li Zhongjun, Auteur ; Li, Hui, Auteur . - pp. 1307-1333.
Langues : Anglais (eng)
in Earthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1307-1333
Mots-clés : Pounding Highway bridge Shaking table test Semiactive control MR damper Seismic response Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Pounding between adjacent superstructures has been a major cause of highway bridge damage in the past several earthquakes. This paper presents an experimental and analytical study on pounding reduction of highway bridges subjected to earthquake ground motions by using magnetorheological (MR) dampers. An analytical model, which incorporates structural pounding and MR dampers, is developed. A series of shaking table tests on a 1:20 scaled base-isolated bridge model are performed to investigate the effects of pounding between adjacent superstructures on the dynamics of the structures. Based on the test results, the parameters of the linear and the nonlinear viscoelastic impact models are identified. Performance of the semiactive system for reducing structural pounding is also investigated experimentally, in which the MR dampers are used in conjunction with the proposed control strategy, to verify the effectiveness of the MR dampers. Structural responses are also simulated by using the established analytical model and compared with the shaking table test results. The results show that pounding between adjacent superstructures of the highway bridge significantly increases the structural acceleration responses. For the base-isolated bridge model considered here, the semiactive control system with MR dampers effectively precludes pounding. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe Exemplaires
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inEarthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1335-1357
Titre : Shake table study on an ordinary low-rise building seismically isolated with SU-FREIs (stable unbonded-fiber reinforced elastomeric isolators) Type de document : texte imprimé Auteurs : Hamid Toopchi-Nezhad, Auteur ; Michael J. Tait, Auteur ; Drysdale, Robert G., Auteur Article en page(s) : pp. 1335-1357 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Fiber reinforced elastomeric isolators Unbonded application Shake table testing Base isolation seismic mitigation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper reports on the investigation of novel fiber reinforced elastomeric isolator (FREI) bearings, which do not have thick end plates, and are used in an unbonded application. Owing to the stable lateral load-displacement response exhibited by the unbonded FREI bearings, the proposed bearings are referred to as stable unbonded (SU)-FREIs. A shake table test program was conducted on a two-story test-structure having well-defined elastic response characteristics. Compared with the results for the corresponding fixed base (FB) structure, the peak response values, distribution of lateral response throughout the height of the structure, and response time histories of the tested base isolated (BI) structure indicate that significantly improved response can be achieved. This study clearly indicates that SU-FREI bearings can provide an effective seismic isolation system. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] Shake table study on an ordinary low-rise building seismically isolated with SU-FREIs (stable unbonded-fiber reinforced elastomeric isolators) [texte imprimé] / Hamid Toopchi-Nezhad, Auteur ; Michael J. Tait, Auteur ; Drysdale, Robert G., Auteur . - pp. 1335-1357.
Génie Civil
Langues : Anglais (eng)
in Earthquake engineering structural dynamics > Vol. 38 N° 11 (Septembre 2009) . - pp. 1335-1357
Mots-clés : Fiber reinforced elastomeric isolators Unbonded application Shake table testing Base isolation seismic mitigation Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper reports on the investigation of novel fiber reinforced elastomeric isolator (FREI) bearings, which do not have thick end plates, and are used in an unbonded application. Owing to the stable lateral load-displacement response exhibited by the unbonded FREI bearings, the proposed bearings are referred to as stable unbonded (SU)-FREIs. A shake table test program was conducted on a two-story test-structure having well-defined elastic response characteristics. Compared with the results for the corresponding fixed base (FB) structure, the peak response values, distribution of lateral response throughout the height of the structure, and response time histories of the tested base isolated (BI) structure indicate that significantly improved response can be achieved. This study clearly indicates that SU-FREI bearings can provide an effective seismic isolation system. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe Exemplaires
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