|Structural Engineering Laboratory|
|Department of Civil Engineering|
|Indian Institute of Science|
Structural Vibration Control Back to Top
An optimal design of a hybrid mass damper (HMD) system, consisting of a tuned mass damper (TMD) and an active mass driver (AMD), as its passive and active control system components respectively, for wind induced or seismically excited building structures, has been studied. Genetic algorithm has been used for the optimization of the hybrid mass damper parameters, as the optimization problem is not necessarily convex. In view of seeking a more realistic model, hardware related constraints have been considered in the model. The hybrid mass damper (HMD) control system strategy for three-dimensional building models, incorporating torsionally coupled modes, under wind induced or seismic excitations has also been studied. As an extension of this study, an assessment of the performance of the control formulation in a damaged structure has also been studied.
The behavior of cable stayed and suspension bridges under seismic loading depends on several nonlinearities present in the structure. These include cable deformation cable tension interactions, tower (support) flexibility, uncertainties associated with the loads, seismic, wind gusts, and moving traffic. A special purpose finite element code has been developed which simulates the self-weight condition of the cable-deck-tower structure taking in to account the exact erection process followed at the construction site. A passive, active and hybrid control strategy to safeguard bridges under vibrations induced due to increased payloads, higher vehicular speed, the use of light and more flexible bridges, seismic forces and wind gusts is presently being examined.