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An Efficient Partial Reanalysis Algorithm for the Locally Changed Structures  

Kim Chee-Kyeong (선문대학교 공과대학 건축학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.17, no.4, 2004 , pp. 459-467 More about this Journal
Abstract
This paper presents an efficient reanalysis algorithm, named PRAS (Partial Reanalysis algorithm using Adaptable Substructuring), for the partially changed structures. The algorithm recalculates directly any displacement or member force under consideration in real time without a full reanalysis in spite of local changes in member stiffness or connectivity_ The key procedures consists of 1) partitioning the whole structure into the changed part and the unchanged part, 2) condensing the internal degrees of freedom and forming the unchanged part substructure, 3) assembling and solving the new stiffness matrix from the unchanged part substructure and the changed members.
Keywords
PRAS algorithm; adaptable substructuring; response force distribution factor; structural reanalysis; stiffness change; static condensation;
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