Analysis of thermally induced forces in steel columns subjected to fire

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Analysis of thermally induced forces in steel columns subjected to fire

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dc.contributor.advisor Engelhardt, Michael D.
dc.creator Ho, Chung Thi Thu
dc.date.accessioned 2010-12-21T16:02:00Z
dc.date.accessioned 2010-12-21T16:02:05Z
dc.date.available 2010-12-21T16:02:00Z
dc.date.available 2010-12-21T16:02:05Z
dc.date.created 2010-08
dc.date.issued 2010-12-21
dc.date.submitted August 2010
dc.identifier.uri http://hdl.handle.net/2152/ETD-UT-2010-08-1937
dc.description.abstract The effects that thermally induced forces and deformations have on the performance and safety of steel columns subjected to fire are not well understood and are not clearly treated in building codes and standards. This thesis investigates the behavior of steel columns subjected to fire, with an emphasis on studying the significance of thermally induced forces and deformations. The approach used in this research is to conduct a series of analyses of steel columns using the finite element computer program ABAQUS. Columns are modeled in ABAQUS using beam elements that include nonlinear geometry, nonlinear temperature dependent material properties, and initial geometric imperfections. Using the ABAQUS model, a series of analyses are conducted on the behavior of columns under axial compression for temperatures varying from room temperature up to 2400° F. A series of individual columns are analyzed with and without restraint to thermal expansion. A column that is part of a truss is also analyzed to study a simple case of a flexible restraint to thermal expansion. Finally, the behavior of columns that are part of multi-story steel moment frames are investigated. All of the analyses conducted in this research indicate that forces generated by restraint to thermal expansion can have a very large impact on the performance of a steel column in fire. When evaluating the safety of a column in a fire, it is important to recognize that the total axial force in the column is the sum of the force generated by external gravity load on the frame and the force generated by restraint to thermal expansion. The force generated by restrained thermal expansion can be very large, and neglecting this force can lead to unsafe designs.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subject Fire
dc.subject Thermally-induced force and strain
dc.subject Steel column
dc.subject High-rise steel building
dc.title Analysis of thermally induced forces in steel columns subjected to fire
dc.date.updated 2010-12-21T16:02:05Z
dc.contributor.committeeMember Helwig, Todd A.
dc.description.department Civil, Architectural, and Environmental Engineering
dc.type.genre thesis
dc.type.material text
thesis.degree.department Civil, Architectural, and Environmental Engineering
thesis.degree.discipline Civil Engineering
thesis.degree.grantor University of Texas at Austin
thesis.degree.level Masters
thesis.degree.name Master of Science in Engineering

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