逐次領域絞り込み法に領域分割有限要素計算手法を併用したトラス構造の効率的損傷同走法の提案

概要

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Damage identification methods based on changes in natural frequencies and mode shapes using finite element methods have received wide attention for their high applicability to complex structures. In this paper, for truss structures we develop an effective damage identification method with a successive iteration method of bounding, domain and a domain decomposition finite element technique. By means of the successive iteration method of bounding domain, a truss structure is subdivided successively into subdomains of truss structures, and finally a damaged truss member is identified. In order to reduce computational time, the domain decomposition finite element technique is also developed to give frequencies and mode shapes of the whole structure by assembling subdomain frequencies and mode shapes. We examine the validity of the domain decomposition finite element technique by performing the vibration analysis for a subdivided two-dimensional truss structure, and then a numerical damage identification study for a two-dimensional truss structure is conducted. It is recognized that the present damage identification method is effective and computationally efficient.
2004-01-25