mohammed mekki

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Probabilistic approach in determining the vulnerability curves of civil engineering structures

Dans le contexte du calcul sismique basé sur la notion de performance, lesingénieurs se trouvent ... more Dans le contexte du calcul sismique basé sur la notion de performance, lesingénieurs se trouvent confrontés à une tâche difficile pour estimer la performance etévaluer les risques des systèmes sol-structure en interaction. Afin d’accomplir cette tâcheavec succès, toutes les sources d'incertitudes aléatoires et épistémiques doivent être prisesen compte au cours du processus de conception. Ainsi, des méthodes appropriées sontnécessaires pour l'étude de la propagation de l'incertitude des paramètres du systèmedécrivant la structure, le sol, et les charges appliquées aux réponses structurelles endéfinissant des états limites de performance. L’objectif de cette thèse est de contribuer àl’étude du comportement sismique des structures en interaction avec le sol et d’offrir denouveaux outils pour le traitement de problèmes pertinents, orientés vers la nouvellephilosophie de conception parasismique des structures : la conception basée sur laperformance (performance-based design)....

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Effects of shear wave velocity and soil structure interaction on the structural pounding during earthquakes

Revista Facultad de Ingeniería Universidad de Antioquia

It has been found that in the event of a strong earthquake, and due to insufficient distance betw... more It has been found that in the event of a strong earthquake, and due to insufficient distance between two adjacent structures, the lateral movement at the top of structures may cause collisions between them. This phenomenon, commonly known as seismic collision, can generate impact forces that were not considered during the initial design of the structure. These forces can cause significant structural damage or lead to complete collapse of the structure. The main purpose of this paper is to study the coupled effects of soil flexibility and impact between adjacent buildings undergoing seismic excitation. To capture the impact forces between the structures during the collision, a modified linear viscoelastic model was used effectively. Particular attention has been paid to studying the effects of shear wave velocity, first on the soil structure interaction and then on the collision response of adjacent structures. Three configurations of adjacent structures were analyzed: light-light, l...

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Sensitivity Analysis of Uncertain Material RC Structure and Soil Parameters on Seismic Response of Soil-Structure Interaction Systems

Periodica Polytechnica Civil Engineering

In seismic performance based design context, engineers are faced to a difficult task to estimate ... more In seismic performance based design context, engineers are faced to a difficult task to estimate the response of soil-structure interaction (SSI) systems. To accomplish this task successfully, all sources of random and epistemic uncertainties should be taken into account. However, the uncertain parameters have not the same influence on the model response; a sensitivity analysis is therefore required. This article treats the two following aspects: the first one is to perform a sensitivity analysis on all the parameters in order to study their influence on the structural response. The uncertainties effect is done by studying the sensitivity of the maximum structure displacement towards the used materials parameters variation (fc’, εc0, εcu, Es, fsy, α, εsu, A, ξ) and soil properties (ξg, ν) on the SSI seismic response. This study consists of determining, quantifying and analyzing how the outputs of the N2-SSI model are affected by input variables fluctuations. The second aspect is ana...

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Proposal of the Multi-modal N2-SSI method to study higher modes effect on the nonlinear response of SSI system

The present study consists in describing and applying a new approach called N2-SSI Multi-modal to... more The present study consists in describing and applying a new approach called N2-SSI Multi-modal to study the effect of higher modes on the nonlinear seismic response of soil structure interaction (SSI) systems. The two essential parameters in performance-based design considered in this study are lateral displacement and inter-story drift. The proposed method consists in applying N2-SSI method (which takes into account only one vibration mode) to a considerable number of vibration modes. The results found were compared with those obtained by other methods to assess its reliability. We also showed through this approach, that it was not reasonable to take a single seismic behaviour factor for all modes.

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Prise en compte de l’interaction solstructure dans le cadre d’une approche capacitive d’estimation de la performance sismique de structures en B. A

L'objectif de cette contribution est de prendre en compte l'effet de l'interaction solstructure s... more L'objectif de cette contribution est de prendre en compte l'effet de l'interaction solstructure sur la réponse sismique d'une structure en B.A dans le cadre d'une approche capacitive (concept d'analyse basée sur la performance) pour une conception parasismique justifiée. La prise en compte de cette interaction (sol-fondation) s'effectue au travers de fonctions d'impédance associées à un système ressorts-amortisseurs intégrant ainsi la flexibilité du sol. Le spectre de réponse du code parasismique Algérien RPA2003 est utilisé. Une étude paramétrique a permis de quantifier les effets de l'ISS sur : la période fondamentale de la structure, l'effet de la profondeur d'ancrage des fondations, l'effort tranchant à la base ainsi que les déplacements.

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Approche probabiliste dans la détermination des courbes de vulnérabilité des structures en génie civil

Dans le contexte du calcul sismique base sur la notion de performance, lesingenieurs se trouvent ... more Dans le contexte du calcul sismique base sur la notion de performance, lesingenieurs se trouvent confrontes a une tâche difficile pour estimer la performance etevaluer les risques des systemes sol-structure en interaction. Afin d’accomplir cette tâcheavec succes, toutes les sources d'incertitudes aleatoires et epistemiques doivent etre prisesen compte au cours du processus de conception. Ainsi, des methodes appropriees sontnecessaires pour l'etude de la propagation de l'incertitude des parametres du systemedecrivant la structure, le sol, et les charges appliquees aux reponses structurelles endefinissant des etats limites de performance. L’objectif de cette these est de contribuer al’etude du comportement sismique des structures en interaction avec le sol et d’offrir denouveaux outils pour le traitement de problemes pertinents, orientes vers la nouvellephilosophie de conception parasismique des structures : la conception basee sur laperformance (performance-based design)....

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