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Proceedings Paper

Identification of seismic damage to structural buildings using the quasi-Newton method
Author(s): Satoko Ono; Tadatoshi Furukawa; Eizaburo Tachibana
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Paper Abstract

In order to restore damaged buildings affected by earthquake excitations, it is important to identify damaged elements in terms of their dynamic properties; stiffness, mass and damping coefficients. In this paper, a simple method is proposed for identification of the damaged part. By considering all unknown dynamic properties of structure as variables of a target function f in nonlinear programming problem, the damage identification problem can be replaced by a typical unconstrained minimization problem. The target function is defined as f equals (Sigma) [ (yn,i) - (yn*) ]2 where (yn,i) is structural response at the time of t equals (Delta) X n derived from i-th trial variable (Xi), and (yn*) means observed response, respectively. In order to achieve quick convergence, quasi- Newton method and BFGS formulae are adopted for minimizing the target function. Two decision problems are discussed. One is the choice of structural response; displacement, velocity or acceleration. The second is the kind of external excitations that should be adopted. By observing three dimensional graphics. It appeared that good convergence can be achieved by adopting displacement response and sinusoidal excitation. Furthermore, it appeared that we should not evaluate the identified properties only from the response diagrams.

Paper Details

Date Published: 28 June 2002
PDF: 10 pages
Proc. SPIE 4696, Smart Structures and Materials 2002: Smart Systems for Bridges, Structures, and Highways, (28 June 2002); doi: 10.1117/12.472549
Show Author Affiliations
Satoko Ono, Ariake National College of Technology (Japan)
Tadatoshi Furukawa, Osaka Univ. (Japan)
Eizaburo Tachibana, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 4696:
Smart Structures and Materials 2002: Smart Systems for Bridges, Structures, and Highways
S.-C. Liu; Darryll J. Pines, Editor(s)

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