Effect of Local Buckling on Deformation Capacity of Steel Pipe Braces

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Sedehi, Omid | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45191 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Moghaddam, Hassan
Abstract:
In this thesis, finite element (FE) models were developed to study hysteresis behavior of pipe braces subjected to cyclic loading. Thus steel braces previously tested by other investigators are used. The results of the analysis are in good agreement with the experiments. Besides, the FE analysis could also simulate both the overall and local buckling. As a result, a sharp growth in plastic strains is followed by geometric changes at the mid-span due to local buckling. The sharp growth of plastic strains is entitled as strain rises. In fact, the local buckling triggers rupture of braces at the mid-span. The local buckling initiation is identified by the sharp growth in plastic strains. Therefore, the local buckling might be considered as the main practical limit for deformation capacity of braces. Furthermore, previous relationships to estimate the strain concentration ratio at the mid-span are modified
Keywords:
Steel Brace ; Deformation Capacity ; Local Buckling ; Strain Jump ; Strain Localization ; Steel Brace

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