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Date of Publication:2013-01-01

Journal:工程力学

Volume:30

Issue:12

Page Number:176-182

ISSN No.:1000-4750

Abstract:Aiming at the low optimization efficiency of the large structural damage
   identification in civil engineering, a Substructure Virtual Distortion
   Method (SVDM) is presented base on Virtual Distortion Method (VDM). VDM
   is a fast structural reanalysis method which uses virtual distortions to
   simulate structural damages, and the modified structural responses can
   be estimated quickly without rebuilding the whole structural finite
   element model. Based on the VDM, the way of virtual distortions of the
   substructure is reduced to simulate its damages through the
   eigen-decomposition of the substructure stiffness matrix and the
   analysis of the structural motion equation, and thus it extends the
   application of the VDM to more complex practical structures. Via
   analysing the correlations of the distortions with structural responses,
   the main virtual distortions of the substructure are picked up to
   reflect the damages. The correlation estimation equation is presented.
   This reduces the number of necessarily-considered virtual distortions
   and increases the computational efficiency. A numerical 50-story frame
   model is used to verify the proposed method.

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