Experimental and Numerical Investigation on Ductility of Composite Beams in the Hogging Moment Regions under Fire Conditions
Publication: Journal of Structural Engineering
Volume 134, Issue 12
Abstract
This paper presents both the results of an experimental program and numerical simulations, which have been conducted to investigate the ductility of composite beams in the hogging moment regions under fire conditions. The main objective is to study the ductility issue related to the inelastic behavior of composite beams at an elevated temperature. A second objective is to investigate the feasibility of using a finite-element model for parametric studies. To fullfil the first objective, a total of four composite beams with decking slabs were tested to failure. They were designed to represent the internal joint of a continuous beam. The segment between the plastic hinge over support and adjacent point of inflection was represented by one-half of a simply supported beam subjected to a midspan point load. The specimens were heated to a certain temperature before they were subjected to a static point load up to failure. These four test results were then used to validate finite-element models constructed from MSC. Marc Mentat. It is demonstrated that the finite-element analysis gives reasonable accuracy compared to test results. Hence, it provides an efficient, economical, and yet accurate tool to study the inelastic behavior of composite beams in fire. Finally, a parametric study was conducted to investigate the influence of several parameters on the moment-rotation response and the rotational capacity at elevated temperatures.
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Acknowledgments
This research was funded by ARC 5/03 project entitled “Mitigation of Progressive Collapse of Tall Buildings” from the Ministry of Education, Singapore. The writers would also like to acknowledge Corus South East Asia for supplying the structural I-beams and TTJ Design and Engineering for fabricating the steel beams. The first writer was also supported by Singapore Millennium Scholarship. This assistance is gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 12 • December 2008
Pages: 1873 - 1886
Copyright
© 2008 ASCE.
History
Received: Jul 5, 2006
Accepted: Jun 30, 2008
Published online: Dec 1, 2008
Published in print: Dec 2008
Notes
Note. Associate Editor: Venkatesh Kumar R. Kodur
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