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research-article

GENETIC ALGORITHM BASED OPTIMUM SEMI ACTIVE CONTROL OF BUILDING FRAMES USING LIMITED NUMBER OF MR DAMPERS AND SENSORS

[+] Author and Article Information
Vishisht Bhaiya

Ph.D. Student, Department of Civil Engineering, Malaviya National Institute of Technology (MNIT) Jaipur, India
vishishtbhaiya@gmail.com

Shiv Dayal Bharti

Associate Professor, Department of Civil Engineering, MNIT, Jaipur, India
sdbharti@mnit.ac.in

Mahendra Kumar Shrimali

Professor, Department of Civil Engineering, MNIT, Jaipur, India
shrimlaimk@gmail.com

Tushar K. Datta

Formerly, Emeritus Professor, IIT Delhi, Now, Adjunct Faculty, NCDMM, MNIT, Jaipur, India
tushar_k_datta@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4040213 History: Received September 05, 2017; Revised May 02, 2018

Abstract

Optimum semi-active control with limited number of MR dampers and measurement sensors has some unique features. Most important of them is the accurate estimation of control forces developed in the MR dampers from the observations made in the structure. Therefore, observation strategy should form an integral part of the optimization problem. Existing literature on the subject does not address this issue properly. The paper presents a computationally efficient scheme of semi active control of partially observed building frames with limited number of MR dampers and sensors for earthquakes. The control scheme duly integrates the observation scheme with the GA based optimization problem. A ten storey building frame is taken as an illustrative example. LQG with clipped optimal control and bang bang control are used to find the time histories of required voltages in MR dampers. The numerical study shows that (a) the proposed scheme of sensor placement provides optimum reduction of response with greater computational efficiency; (b) optimal placement of sensors varies with response quantity to be controlled, the nature of earthquake and the control algorithm being used; and (c) optimal locations of MR dampers are invariant of response quantity to be controlled and the nature of earthquake.

Copyright (c) 2018 by ASME
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