Authors
Abstract
The race toward new heights has led to the construction of tall flexible buildings
with low inherent structural damping. As buildings get taller their sensitivity to wind
excitations increases which threaten their integrity and serviceability. Therefore the control
of gust responses of tall buildings has gained worldwide attention. In this work an adaptive
Sliding Mode Control (SMC) driven Magneto Rheological (MR) fluid damper is proposed
for the vibration control problem of a wind excited tall building. The equivalent control part
proposed in this work is based on filtering the overall discontinuous control signal for a
better satisfaction of the reachability condition on one hand, and to heal the chattering
phenomenon on the other which is further reduced by replacing the hard switching sign
function by the sigmoid-like function. The adaptive tactic is based on using 3 second time
average variations of the gust speed to estimate the wind loading on the structure by
utilizing the theory of quasi-steady aerodynamics.
Keywords
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