Validation of joint input-state estimation for force identification and response estimation in structural dynamics

This paper presents a validation of a recently developed joi nt input-state estimation algorithm for force identification and response estimation in structural dynam ics, using data obtained from in situ experiments on a footbridge. First, the algorithm is used to identi fy two impact forces applied to the bridge deck. Next, the algorithm is used to extrapolate measured ac celerations due to wind loading to unmeasured locations in the structure. The dynamic model of th e ootbridge used in the system inversion is obtained from a detailed finite element model, that is cali br ted using a set of experimental modal characteristics. The quality of the estimated forces and ac celerations is assessed by comparison with the corresponding measured quantities. In both cases, a ver y good overall agreement is obtained.

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