Robust Passive and Active Dampers

During their lifetimes, flexible structures may experience natural frequency changes under wind speed, ambient temperatures, and relative humidity variations, among other factors, which make the tuned mass damper (TMD) design a challenge. We proposed an approach for robust TMDs design. This approach accounts for structural uncertainties, optimization objectives, and input excitation (wind or earthquake). For the use of TMDs in buildings, practical design parameters can be different from the optimum ones. However, predetermined optimal parameters for a primary structure with uncertainties are crucial to attaining design robustness. The proposed approach showed its robustness and effectiveness in reducing the response of tall buildings under multidirectional wind loads. In addition, LQG and fuzzy logic controllers may enhance the performance of the TMD.

The lever mechanism shows that higher response reductions are achievable by smaller damping devices. We accounted for stiffness uncertainty and damper failure to check the robustness of the mitigation system. Our findings show that viscous dampers are a viable solution for vibration attenuation in high-rise buildings and can minimize structural and nonstructural damage. Viscous dampers enhanced the dynamic performance of tall buildings under multiple hazards and can directly promote community resiliency.

 

Robust Passive and Active Tuned Mass Dampers

Outer Bracing System

Selected Publications