On the efficiency of semi‐active smart structures: self‐regulating MR dampers control system for tall buildings

Abstract

SUMMARYMany severe dynamical loadings such as earthquakes and strong winds may subject to structural systems during their lifetime and lead to changes in structural characteristics. Hence, employing an adaptive control strategy that can deal with these alterations compound with design of the structural elements would undoubtedly be the most effective alternative design for the old-fashioned design methods, which are relatively inefficient in response to these unforeseen conditions. In the current study, benefits of employing the modern control systems for design of tall buildings in comparison with the uncontrolled traditionally designed structures are thoroughly investigated. To contract the vibrational responses due to seismic excitations, the innovative direct-modulating semi-active controller is designed for magneto-rheological dampers, which are installed in an 11-storey sample building converting it to a smart structure. Copyright

Technical Note: Active and Semi-Active Strategies to Control Building Structures Under Large Earthquake Motion

“…Pnevmatikos and Gantes [2010] proposed a 2-stage activated-deactivated diagonal braces-based structure equipped with active variable stiffness devices; the control algorithm determines the bracing stiffness based on the frequency content of a range of anticipated earthquake signals, achieving a significant reduction in the response of the controlled structure. Similarly, other control schemes have been designed to track the changes in the structure and incorporate such modified parameter into the controller in real time [Rahbari and Talatahari, 2014]. For instance, Bitaraf et al [2012] proposed a direct adaptive control method, capable of evaluating both the undamaged and damaged condition of a building structure using semi-active and active devices.…”

Investigations on train‐induced vibration and vibration control of an over‐track building using thick‐layer rubber bearings

“…While in the horizontal direction, isolation rubber bearings were simulated by link element, and the Bouc-Wen model was used. [24,25] The Bouc-Wen model are shown in the Equations 1 and 2, where k is initial stiffness of rubber bearing before yielding; F y is yield force of rubber bearing; γ is ratio of tangent stiffness after yielding to initial elastic stiffness; s is parameter determining the shape of yield position curve; α and β are parameters 2 and 3, respectively. Based on the parameters in Tables 2 and 3, the specific parameters for Bouc-Wen and parallel element could be defined.…”

A Review on Adaptive Methods for Structural Control

“…More recently, semiactive devices, like megnetorheological and electrorheological dampers, started to become widespread in structural applications [7 -9]. They associate the reliability of passive devices to the versatility and effectiveness of active devices and cannot produce instability as they do not inject energy to the structure [10]. Viable alternatives are also active and semiactive tendon systems [11,12] and active and semiactive base isolation [13,14].…”