ABSTRACT
This research intends to investigate an identification process of a railway bridge subjected to high-speed trains loading using a bridge-soil coupled system. The proposed algorithm can extract the actual system parameters rather than the mode parameters or equivalent ones. The actual system parameters are believed to be more meaningful and useful. The dynamic interaction of the bridge-foundation with the underlying soil is taken into account. The bridge foundation is simulated with an equivalent foundation-spring model. This equivalent spring for the consideration of dynamic interaction between the bridge foundation and the underlying soil, as well as with consideration of the combing radiation damping and material damping simultaneously. With the analysis of system identification, the actual stiffness and the damping coefficients can be obtained. Consequently, the calculations of the actual shears and moments at the bottom of the piers caused by the non-constant velocity motion or sudden brake are possible, which is more helpful for the safety evaluation of a high-speed railway bridge.
