19 research outputs found

    Influence of the combined system FPS isolator with viscous fluid damper on the dynamic response of the isolated bridges

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    To illustrate the effect of the combined system FPS isolator (Fiction Pendulum System) with viscous fluid damper on the seismic response of the isolated bridges, a comparative study was realised on a bridge in three different situations. In first situation, we consider the bridge without seismic isolation, while in the second and the third situation, the bridge is successively equipped with a system of FPS isolator then with a combined system FPS isolator and viscous fluid damper. The analysis was done using the digital program of dynamic analysis of the structures SAP2000 and this study consists in comparing the responses of the bridge in terms of baseshear, displacement, acceleration and absorbed energy. The results show that the incorporation of a damping device with viscous fluid damper to the isolator allows to dissipate the maximum of energy, to control the deformations which are located at the level of the isolator and to realize a satisfying compromise between the reduction of the seismic forces and the increase of the deformations in the seismic isolation

    THE EFFECT OF RECYCLED RUBBER AGGREGATES AND DUNE SAND OF EL-OUED REGION ON THE COMPRESSIVE STRENGTH OF CEMENTITIOUS MORTAR: OPTIMIZATION USING TAGUCHI METHOD

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    This study optimizes the effect of recycled rubber aggregates and dune sand of El-Oued's region by maximizing the compressive strength of cementitious mortar using Taguchi's design experiments. The experiments were designed using an L9 orthogonal array to see the different relationships between the factors targeted in our research, namely: water/cement (W/C) ratio, rubber aggregates (RA) content, and dune sand (SD) content, with the levels of each factor in the mortar mixture. The samples were tested at 28 days in each of the nine trial conditions for two responses: compressive strength and ultrasonic pulse velocity. The results of the analysis of variation (ANOVA) show that RA content is the factor that has the largest effect on the two tests, and the second factor affecting the two tests is the W/C ratio. Then, the analysis shows that the SD content has no significant effect on the mechanical resistance of the mortar for the two tests. And from the mathematical models investigated in this study, we conclude that the factors RA content and W/C ratio have a negative influence on the responses of the compression test and the ultrasonic test togethe

    Use of anticoagulants and antiplatelet agents in stable outpatients with coronary artery disease and atrial fibrillation. International CLARIFY registry

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    CONCEPTION PARASISMIQUE DES PONTS EQUIPES DE SYSTEMES D’ISOLATION AVEC PRISE EN COMPTE DE L’INTERACTION SOL-STRUCTURE

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    Les isolations parasismiques peuvent être considérées comme un moyen important pouvant offrir une solution technique efficace pour la protection des ponts contre les risques sismiques. Elles consistent à découpler le mouvement de la pile et des isolateurs du mouvement du tablier et à réduire la force sismique induite lors d'un séisme avant qu’elle soit transférée à ce dernier. Dans le but de mieux comprendre l'effet de ces dispositifs d'isolation avec prise en compte de l’effet de l’interaction sol-structure sur les réponses sismiques des ponts, trois études comparatives ont été effectuées dans ce travail. La première illustre l'influence des systèmes d’isolation parasismique sur la réponse dynamique des ponts isolés, alors que la deuxième et la troisième étude illustrent l'effet du système combiné isolateur FPS (Friction Pendulum System) avec amortisseur à fluide visqueux et l’influence de l’interaction sol-structure sur les réponses sismiques des ponts isolés, dont les résultats ont été analysés à l’aide du programme numérique d’analyse dynamique des structures SAP2000. Ces études consistent à comparer les réponses du pont en termes d’effort tranchant, déplacement, d'accélération, d'énergie absorbée et de fréquence fondamentale

    Writer identification using textural features

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    Writer Identification has gained increasing importance in the scientific community in recent years. In this paper, we propose an approach based on the combination of local textural descriptors and encoding methods (VLAD and Triangulation Embedding). The tests carried out in the bilingual LAMIS dataset made it possible to reach 100% in the Arabic version and 100% in the French version
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