Evaluation of TMD Performance in Footbridges Using Human Walking Probabilistic Models

Footbridges are generally slender and lightweight structures with low stiffness, designed to support dynamic loads generated by crowds. Therefore, these exposed vibration problems related the resonance of human walking step frequencies lower modes. To mitigate problems, one most applied corrective strategies is installation tuned mass damper (TMD) systems that aim at reduction footbridge’s dominant mode. A fundamental matter in both footbridge TMD design pedestrian load modelling, considered as a deterministically moving force or biodynamic model. However, gait random process, deterministic models can lead non-realistic results, directly affecting system efficiency. In contrast, use probabilistic distributions simulate walk randomness more reliable time series predictions. this paper, (RW) algorithm developed different crowd scenarios using simplified plane model coupled human-structure-TMD system. each scenario, efficiency reducing amplitudes assessed. Results highlight importance considering pedestrians’ properties design.