We explore the effectiveness of dynamic methods for damage detection in the case of windexcited suspension bridges, with specific reference to the minimization of the uncertainties related to system identification. The considered damage is represented by a sectional loss in the main cables with arbitrary intensity, location and extension. The wind excited vertical response of the structure is analytically modeled using a continuum formulation for the damaged suspension bridge, derived by the authors in a separate study, and suitable expressions for the wind forces acting on the deck, modeling the wind velocity field as a multivariate Gaussian stochastic process. Then, a realistic damage scenario is considered and the possibility of observing the resulting frequency variations from response data is examined.
Damage detection in suspension bridges from wind responsemeasurements and automatic mode selection: a feasibility study
UBERTINI, Filippo;MATERAZZI, Annibale Luigi
2012
Abstract
We explore the effectiveness of dynamic methods for damage detection in the case of windexcited suspension bridges, with specific reference to the minimization of the uncertainties related to system identification. The considered damage is represented by a sectional loss in the main cables with arbitrary intensity, location and extension. The wind excited vertical response of the structure is analytically modeled using a continuum formulation for the damaged suspension bridge, derived by the authors in a separate study, and suitable expressions for the wind forces acting on the deck, modeling the wind velocity field as a multivariate Gaussian stochastic process. Then, a realistic damage scenario is considered and the possibility of observing the resulting frequency variations from response data is examined.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.