Advanced finite element models for the distortional buckling analysis of I-beams

Poon, Chou Ping (2003). Advanced finite element models for the distortional buckling analysis of I-beams MPhil Thesis, School of Engineering, The University of Queensland.

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Author Poon, Chou Ping
Thesis Title Advanced finite element models for the distortional buckling analysis of I-beams
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2003
Thesis type MPhil Thesis
Supervisor Dr Hamid Ronagh
Total pages 156
Collection year 2003
Language eng
Subjects L
290801 Structural Engineering
680203 Civil
Formatted abstract
Distortional buckling may occur in I-section beam-columns with slender webs and stocky flanges; this mode of buckling has received relatively less attention in the past in comparison to local and lateral-torsional buckling and it is generally ignored in design calculations. This thesis aims at providing new methods of distortional buckling calculations and furthering the understanding of this type of buckling. In order to achieve this, a simple closed-form solution, which can be implemented easily in spreadsheets is developed. In addition, a versatile finite element formulation is also presented in this thesis. This formulation is an improved version of an existing finite element formulation. The improvement involves using a fifth order polynomial instead of a cubic polynomial for web displacements, allowing the model to buckle in response to a more complex web distortion including the web local buckling.

The new methods are then used in this study to provide numerical solutions to a wide range of problems. The solutions under various loading and support conditions are considered and compiled in the forms of tables and figures and compared with different published solutions and methods.

Both the closed-form solution and the finite element formulation are proved to be accurate and effective. The studies reveal that the distortional buckling shall not be ignored, as in some cases the reduction in the critical load can be significant.
Keyword Buckling mechanics
Civil engineering

Document type: Thesis
Collection: UQ Theses (RHD) - UQ staff and students only
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Created: Fri, 24 Aug 2007, 18:11:57 EST