Documents disponibles écrits par cet auteur

Benchmark footbridge for vibration serviceability assessment under the vertical component of pedestrian load / Stana Zivanovic in Journal of structural engineering, Vol. 138 N° 10 (Octobre 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 10 (Octobre 2012) . - pp.1193–1202. Titre : Benchmark footbridge for vibration serviceability assessment under the vertical component of pedestrian load Type de document : texte imprimé Auteurs : Stana Zivanovic, Auteur Année de publication : 2013 Article en page(s) : pp.1193–1202. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : Benchmark  footbridge  Vibration  Walking  loading  Pedestrian-structure  interaction Résumé : Vibration serviceability criteria are governing the design and determining the cost of modern, slender footbridges. Efficient and reliable evaluation of dynamic performance of these structures usually requires a detailed insight into the structural behavior under human-induced dynamic loading. Design procedures are becoming ever more sophisticated and versatile, and for their successful use, a thorough verification on a range of structures is required. The verification is currently hampered by a lack of experimental data that are presented in the form directly usable in the verification process. This study presents a comprehensive experimental data set acquired on a box-girder footbridge that is lively in the vertical direction. The data are acquired under normal operating conditions and are presented using a range of descriptors suitable for easy extraction of desired information. This will allow researchers and designers to use this bridge as a benchmark structure for vibration serviceability checks under the vertical component of the pedestrian loading. In addition, capabilities of a sophisticated force model (developed for walking over rigid surfaces) to predict vibrations on this lively bridge are investigated. It was found that there are discrepancies between computed and measured responses. These differences most likely are a consequence of the pedestrian-structure interaction on this lively bridge. The interaction was then quantified in the form of pedestrian contribution to the overall damping of the human-structure system. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000571 [article] Benchmark footbridge for vibration serviceability assessment under the vertical component of pedestrian load [texte imprimé] / Stana Zivanovic, Auteur . - 2013 . - pp.1193–1202. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 10 (Octobre 2012) . - pp.1193–1202. Mots-clés : Benchmark  footbridge  Vibration  Walking  loading  Pedestrian-structure  interaction Résumé : Vibration serviceability criteria are governing the design and determining the cost of modern, slender footbridges. Efficient and reliable evaluation of dynamic performance of these structures usually requires a detailed insight into the structural behavior under human-induced dynamic loading. Design procedures are becoming ever more sophisticated and versatile, and for their successful use, a thorough verification on a range of structures is required. The verification is currently hampered by a lack of experimental data that are presented in the form directly usable in the verification process. This study presents a comprehensive experimental data set acquired on a box-girder footbridge that is lively in the vertical direction. The data are acquired under normal operating conditions and are presented using a range of descriptors suitable for easy extraction of desired information. This will allow researchers and designers to use this bridge as a benchmark structure for vibration serviceability checks under the vertical component of the pedestrian loading. In addition, capabilities of a sophisticated force model (developed for walking over rigid surfaces) to predict vibrations on this lively bridge are investigated. It was found that there are discrepancies between computed and measured responses. These differences most likely are a consequence of the pedestrian-structure interaction on this lively bridge. The interaction was then quantified in the form of pedestrian contribution to the overall damping of the human-structure system. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000571

Modeling spatially unrestricted pedestrian traffic on footbridges / Stana Zivanovic in Journal of structural engineering, Vol. 136 N° 10 (Octobre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1296-1308 Titre : Modeling spatially unrestricted pedestrian traffic on footbridges Type de document : texte imprimé Auteurs : Stana Zivanovic, Auteur ; Aleksandar Pavic, Auteur ; Einar Thor Ingolfsson, Auteur Année de publication : 2011 Article en page(s) : pp. 1296-1308 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Footbridge  Vibration  serviceability  Spatially  unrestricted  pedestrian  traffic  Monte  Carlo  simulations  Human-structure  interaction Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The research into modeling walking-induced dynamic loading and its effects on footbridge structures and people using them has been intensified in the past decade after some high profile vibration serviceability failures. In particular, the crowd induced loading, characterized by spatially restricted movement of pedestrians, has kept attracting attention of researchers. However, it is the normal spatially unrestricted pedestrian traffic, and its vertical dynamic loading component, that is the most relevant for vibration serviceability checks for most footbridges. Despite the existence of numerous design procedures concerned with this loading, the current confidence in its modeling is low due to lack of verification of the models on as-built structures. This is the motivation behind reviewing the existing design procedures for modeling normal pedestrian traffic in this paper and evaluating their performance against the experimental data acquired on two as-built footbridges. Additionally, the use of Monte Carlo simulations is also investigated. Possible factors that cause discrepancies between measured and calculated vibration responses, including possibility of existence of pedestrian-structure dynamic interaction, are discussed. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i10/p1296_s1?isAuthorized=no [article] Modeling spatially unrestricted pedestrian traffic on footbridges [texte imprimé] / Stana Zivanovic, Auteur ; Aleksandar Pavic, Auteur ; Einar Thor Ingolfsson, Auteur . - 2011 . - pp. 1296-1308. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1296-1308 Mots-clés : Footbridge  Vibration  serviceability  Spatially  unrestricted  pedestrian  traffic  Monte  Carlo  simulations  Human-structure  interaction Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The research into modeling walking-induced dynamic loading and its effects on footbridge structures and people using them has been intensified in the past decade after some high profile vibration serviceability failures. In particular, the crowd induced loading, characterized by spatially restricted movement of pedestrians, has kept attracting attention of researchers. However, it is the normal spatially unrestricted pedestrian traffic, and its vertical dynamic loading component, that is the most relevant for vibration serviceability checks for most footbridges. Despite the existence of numerous design procedures concerned with this loading, the current confidence in its modeling is low due to lack of verification of the models on as-built structures. This is the motivation behind reviewing the existing design procedures for modeling normal pedestrian traffic in this paper and evaluating their performance against the experimental data acquired on two as-built footbridges. Additionally, the use of Monte Carlo simulations is also investigated. Possible factors that cause discrepancies between measured and calculated vibration responses, including possibility of existence of pedestrian-structure dynamic interaction, are discussed. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i10/p1296_s1?isAuthorized=no