Abstract
It is known that stationary human occupants act as dynamic mass-spring-damper systems and can change modal properties (frequency and damping) of civil engineering structures. However, there is a lack of information on the modal properties of footbridgs occupied by stationary people. A full scale measurement is carried out to investigate the influence of stationary people on a existing footbridge with center span length of 12m. Complex eigenvalue calculation is also conducted using 2 degree of freedom ISO5982:1981 human model for 9 bridge models with fundamental frequency of 1.0Hz-9.0Hz in addition to above-mentioned existing footbridge. Based on experimental and analytical results, it is revealed that the structural damping of the footbridge increases according to the increase of number of stationary people on the center span of the bridge due to the dynamic interaction.
