New discrete mass model examining the dynamics of multiple-element-pendulum impact dampers for bridge stay-cables

A new discrete multi-degree-of-freedom model is presented to examine the behavior of a multiple-element-pendulum impact damper for mitigating aeroelastic vibration of bridge stays. An earlier model, previously derived to study vibrations, did not consider simultaneous multi-mode stay response and non-distributed load cases. The new, discrete multi-degree-of-freedom model is calibrated using data derived from a field experiment on a 31.2 m long stay with integrated damper. Experiments are performed at Vienna University of Technology. Both free-vibration tests and forced-vibration tests are used to calibrate the new model and examine its adequacy. Identification of model parameters is discussed. The new model enables design and implementation of the damping apparatus on a standard stay-cable under various external loads. •The dynamics of stay-cables equipped with a “chain-like” impact damper is studied.•A new model is derived to describe the interaction between cable and damper.•Comparison between numerical simulations and full-scale experiment is conducted.•Dimensionless model parameters are calibrated using field experiments.