Abstract Summary
Human-induced loads may produce resonance when the forcing frequency coincides with the natural frequency of the system. In this work, the dynamic measurements performed on a pedestrian cable-stayed bridge in Uppsala, Sweden are presented. The dynamic properties of the system have been identified and different loading scenarios are evaluated. A comparison between the theoretical and measured acceleration of the bridge is made using a detailed finite element model. Different modelling aspects are considered and evaluated by studying their influence on the natural frequencies of the system such as the cable system, railings, deck, and boundary conditions. Moreover, a parametric analysis of the boundary conditions of the system is presented and the calibration of the model is performed with reference to the identified frequencies. Special focus is given to the resonant response of the cable system potentially compromising the serviceability limit state of the structure. Furthermore, a simulation of a crowd event is presented, and the human-structure interaction effect is taken into account over the studied bridge. A considerable reduction of the dynamic response of the system is found, highlighting the importance of this phenomenon and its need to be considered in the current design guidelines.
