In this research, performance multiple tuned mass dampers (MTMDs) with consideration of the hysteresis behavior and cracking effect of concrete structures under near field earthquake records with high intensity are carefully investigated. Inelastic analysis was performed by employing Takeda hysteresis model, on mathematical model in a state-space form using a program written in Matlab. In the first step, optimum parameter of TMD for single story frame equipped by spectrum TMD is obtained. In the second step, the best place of MTMDs for ten-story frame from two aspects, plastic energy dissipation and maximum lateral displacement, has been studied. And in the last step, the effect of building height in performance of MTMDs is investigated by analysis of a twenty-story resistance frame. Results show that entering the structure into the field of nonlinear behavior and increasing structure height, TMD does not affect the linear behavior of structure. On the other hand, by using the TMD better energy distribution is formed in structure and maximum energy of plastic hinges is reduced. To achieve the best place TMD should multiple target criteria parameters and all potential placement of MTMD simultaneously applied.
It has been observed during previous earthquakes that the damage to operational and functional components of buildings often result in more injuries, fatalities and property damage than those inflicted by structural damage. Operational and functional components of a building include architectural components, mechanical and electrical equipment, as well as building contents. A rational approach to designing these elements against seismic excitations involves the use of floor design spectra. The development of such design spectra for buildings in Canada constitutes the objective of the paper. This objective was achieved by conducting comprehensive analyses of selected reinforced concrete buildings, with different lateral force resisting systems and building heights, under code compatible earthquake records for an eastern and a western Canadian city. It was observed that the floor response was significantly amplified, especially for buildings with short periods. Generally, the higher floors showed higher amplifications with differences in spectra between the floors being more pronounced in low-rise buildings and shear wall buildings with short fundamental periods. The results provided a large volume of data to generate floor response spectra for the design of operational and functional components of buildings in Canada. The details of the approach and the design spectra are presented in the paper.Résumé : Lors de séismes antérieurs, il a été observé que les dommages aux composantes opérationnelles et fonctionnelles des bâtiments résultent souvent en plus de blessures, de décès et de dommages à la propriété que ceux causés par les dommages structuraux. Les composantes opérationnelles et fonctionnelles d'un bâtiment comprennent les composantes architecturales, les équipements mécaniques et électriques ainsi que le contenu des bâtiments. Une approche rationnelle pour la conception de ces éléments pour résister aux séismes implique l'utilisation de spectres de réponse au niveau du plancher. L'objectif de cet article est le développement de tels spectres de conception pour les bâtiments du Canada. Cet objectif a été atteint en réalisant des analyses complètes de bâtiments en béton armé sélectionnés comportant différents systèmes de renfort contre les forces latérales et différentes hauteurs de bâtiments, selon les enregistrements sismiques compatibles aux codes pour une ville canadienne de l'Est et une de l'Ouest. Il a été remarqué que la réponse au niveau du plancher était grandement amplifiée, particulièrement pour les bâtiments à courtes périodes. Règle générale, les planchers plus hauts dans la structure ont montré de plus grandes amplifications et les différences entre les spectres étaient plus prononcées entre les planchers dans les bâtiments de faible hauteur et dans les bâtiments comportant des murs de contreventement à courtes périodes fondamentales. Les résultats ont engendré un grand nombre de données afin de générer les spectres de ré-ponse au niveau des planchers pour la conception des composantes opérationn...
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