Design of a Semiactive TMD for Lightweight Pedestrian Structures Considering Human–Structure–Actuator Interaction

Lightweight pedestrian structures constructed with high strength-to-weight ratio materials, such as fiber-reinforced polymers (FRP), may experience large accelerations due to their lightness, thus overcoming the serviceability limit state. Additionally, uncertainties associated human–structure interaction phenomena become relevant. Under these circumstances, variations in actions could modify modal properties of coupled system and classical approaches based on passive Tuned Mass Dampers (TMD) do not offer an effective solution. An alternative solution is use a Semiactive TMD (STMD), which includes semiactive damper that, when properly designed, be for relatively broad frequency band, offering robust significant are present. Thus, this paper presents design methodology STMDs applied lightweight including actuator–structure interaction. A multiobjective optimization procedure has been proposed simultaneously minimize structure acceleration, inertial mass, maximum force. The FRP footbridge. Realistic simulations, uncertainties, phenomena, nonlinear model, noise-contaminated signals, practical elements (in-line digital filters) needed successful implementation control law, validate methodology. As conclusion, STMD more than its counterpart both, canceling response or achieving similar performance lower mass.