Remote sensing of damage bridge structure of free vibration by using finite element method based on subspace fitting

摘要

A method was proposed to locate and identify the severities of structural damages based on the subspace minimization (SM). This method applied on the stayed girder Bridge, this work constitutes the reference in this field. Firstly, a reduced discretized analytical model is derived from active vibration. Then, this model is implemented based on output of sensors measurement data under random excitations are developed using pseudo excitation method. To verify the analytical model without feedback control are conducted based on sensors output in each iteration. Finally, the Finite Element Model (FEM) updating method is adopted to trace the dynamic properties of structure and localize the damage with minimizes the space by using the subspace minimization. Three degree of freedom (DOF) coupled model is investigated in this paper to analyze the vibration sensor outputs.