Title :
Gradient algorithm for structural parameter estimation and nonlinear restoring forces
Author :
Garrido, R. ; Rivero-Angeles, F.J. ; Martinez-Garcia, J.C. ; Martinez-Guerra, R. ; Gomez-Gonzalez, B.
Author_Institution :
Dept. of Autom. Control, CINVESTAV-IPN, Mexico City, Mexico
fDate :
June 30 2004-July 2 2004
Abstract :
Civil structures undergo hysteresis cycles due to cracking or yielding when subjected to severe strong motions. Seismic instrumentation, structural monitoring and system identification techniques have been used in the past years to assess damage. The present research proposes a gradient algorithm to simultaneously identify the combined driving and nonlinear restoring forces, and structural parameters, such as damping and stiffness in a single-degree-of-freedom structure. Simulations are carried out using the EJ Centro (1940) and the Mexico City (1985) seismic records. Encouraging results are obtained for the identification of the parameters and the estimation of the driving and restoring forces.
Keywords :
computerised monitoring; condition monitoring; gradient methods; parameter estimation; structural engineering; civil structure; driving force; gradient algorithm; hysteresis cycle; nonlinear restoring force; seismic instrumentation; structural monitoring; structural parameter estimation; system identification technique;
Conference_Titel :
American Control Conference, 2004. Proceedings of the 2004
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-8335-4