Dynamic Characteristic, Seismic Assessment and Serviceability Assessment of CFST Footbridges

The current study had two specific goals. The first was evaluating the serviceability assessment of Arch CFST (concrete filled steel tube) footbridge under human-induced dynamic loads. The second was to study the nonlinear static pushover analysis of these types of bridges to evaluate the seismic assessment. Three types of bridges are taken as cases study; first using normal weight concrete confined using steel tube (NWCFST), second using lightweight high strength concrete filled steel tube (LWHCFST), and third using the normal steel tube bridges (HST).The dynamic properties of these three types of bridges were carried out using official computer program. The vibration responses to human effects are investigated through the analysis in term of the peak acceleration and frequency. The structure performance of these footbridges is then evaluated with regard to the serviceability requirement given by international codes. The seismic assessment is considered by using non-linear static pushover analysis defined by European code for seismic design EN1998-2(2005). The comparative studies for these three bridges are presented.