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Date of Publication:2013-01-01

Journal:工程力学

Affiliation of Author(s):建设工程学部

Volume:30

Issue:4

Page Number:129-135

ISSN No.:1000-4750

Abstract:For huge complex structures, it is difficult to obtain enough
   information which is required necessarily in their global monitoring.
   Aiming at this problem, a Substructure Isolation Method (SIM) is
   proposed for local damage identification. An isolated substructure is a
   virtual and independent structure, which is separated from a global
   structure by adding virtual supports on the substructure boundary to
   zero the substructure boundary responses. Correspondingly the interior
   responses of the isolated substructure are constructed and used to
   identify the local substructure damage equivalently. In order to reveal
   the essence of the Substructure Isolation Method and unify its basic
   concept, the way of arranging sub-time series is improved according to
   the SIM method based on impulse response, that is, sub-time series are
   extracted section by section, and then are arrayed into a Toeplitz
   matrix. In this way, it not only unifies the expression of SIM based on
   local time series and that based on impulse response, but also
   integrates the basic concept of SIM. An experiment of a cantilever beam
   is used to validate the efficiency and the practical application of this
   method. Both the substructure isolation and damage identification are
   performed successfully using local measured responses.

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