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Behaviour of Repaired Concrete Filled Steel Tubular Column to Steel Beam Joints after Exposure to Fire

Behaviour of Repaired Concrete Filled Steel Tubular Column to Steel Beam Joints after Exposure to... This paper presents the test results and finite element analysis of eight tests. Each test specimen consisted of a concrete filled steel tubular (CFST) column connected by rings to two steel beam segments on each side to represent an interior joint in a building. Except for one test specimen, all the test specimens had been exposed to fire attack under unloaded condition and the fire distorted steel beams and the connecting rings had been replaced by new ones, simulating one possible retrofitting strategy. The test parameters included the column cross-sectional type (3 circular and 5 square), the level of axial load in the column, the beam-column strength ratio and the fire duration time. The applied load in the specimen was a constant axial load in the column followed by a cyclically lateral load applied to the connected beams with increasing amplitude until failure. A refined nonlinear finite element model was developed to analyze the load versus deformation relation of the test specimens. Approximate Updated Lagrangian (UL) formulations were adopted to obtain the stiffness matrix, in which both material and geometric nonlinearities of the structural elements were considered. Comparisons between the test and finite element simulation results show good agreement, which enables the finite element model to be applied in further research studies of earthquake-resistant behaviour of retrofitted fire damaged concrete-filled steel tubular structures. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advances in Structural Engineering SAGE

Behaviour of Repaired Concrete Filled Steel Tubular Column to Steel Beam Joints after Exposure to Fire

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Publisher
SAGE
Copyright
© 2010 SAGE Publications
ISSN
1369-4332
eISSN
2048-4011
DOI
10.1260/1369-4332.13.1.53
Publisher site
See Article on Publisher Site

Abstract

This paper presents the test results and finite element analysis of eight tests. Each test specimen consisted of a concrete filled steel tubular (CFST) column connected by rings to two steel beam segments on each side to represent an interior joint in a building. Except for one test specimen, all the test specimens had been exposed to fire attack under unloaded condition and the fire distorted steel beams and the connecting rings had been replaced by new ones, simulating one possible retrofitting strategy. The test parameters included the column cross-sectional type (3 circular and 5 square), the level of axial load in the column, the beam-column strength ratio and the fire duration time. The applied load in the specimen was a constant axial load in the column followed by a cyclically lateral load applied to the connected beams with increasing amplitude until failure. A refined nonlinear finite element model was developed to analyze the load versus deformation relation of the test specimens. Approximate Updated Lagrangian (UL) formulations were adopted to obtain the stiffness matrix, in which both material and geometric nonlinearities of the structural elements were considered. Comparisons between the test and finite element simulation results show good agreement, which enables the finite element model to be applied in further research studies of earthquake-resistant behaviour of retrofitted fire damaged concrete-filled steel tubular structures.

Journal

Advances in Structural EngineeringSAGE

Published: Feb 1, 2010

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