Cundumi Sánchez, Orlando

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A variable damping semiactive device for control of the seismic response of buildings
(2005) Cundumi Sánchez, Orlando; Suárez, Luis E.; College of Engineering; Martínez Cruzado, José A.; Saffar, Alí; Godoy, Luis A.; López Rodríguez, Ricardo R.; Department of Civil Engineering; Asencio, Eugenio
This dissertation proposes a new semiactive device, composed of two fixedorifice viscous fluid dampers installed in the form of V whose top ends are attached to the upper floor and their lower ends to a point that can move along a vertical rod. The mechanism is termed the Variable-Damping-Semi-Active (VDSA) device. By varying its position, one can provide optimal instantaneous damping to the structure to minimize its seismic response. To determine the proper position of the moving end of the device, two algorithms based on a variation of the Instantaneous Optimal control theory were developed. The modified algorithms, referred to as Qv, are used to compute the response of structures standing alone and of coupled structures. Single and multi degree of freedom models are considered. The responses of the structural systems with the VDSA device subjected to different earthquakes are numerically studied and compared with those obtained with fixed dampers.