Modeling Shear Failure in Precast Prestressed Concrete Hollowcore Slabs under Fire Conditions
Publication: Journal of Structural Engineering
Volume 143, Issue 9
Abstract
Prestressed concrete (PC) hollowcore slabs when exposed to fire are susceptible to failure under shear limit state. However, current approaches do not consider shear limit state in evaluating failure of hollowcore slabs under fire conditions. This paper presents an approach for modeling the response of PC hollowcore slabs by considering the shear limit state. A three-dimensional finite-element model is developed for evaluating failure of fire-exposed PC hollowcore slabs under various limiting states, including through shear. This nonlinear finite-element model uses a transient thermostructural analysis to trace the response of typical hollowcore slabs under fire conditions. The model accounts for temperature-induced degradation of properties of concrete and prestressing strands, cracking in concrete, material and geometrical nonlinearities, realistic fire, load and restraint conditions, and different failure limit states. The validity of the model is established by comparing temperature, deflection, fire resistance, and failure mode from the numerical model with data obtained from fire tests on different hollowcore slabs. In addition, a case study is carried out to illustrate the significance of shear failure mode in hollowcore slabs under fire conditions. The results from the case study show that slab depth and loading pattern have significant influence on the resulting failure mode, and under certain scenarios, failure of hollowcore slabs can occur through shear limit state before attaining flexural failure.
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Acknowledgments
The authors wish to acknowledge the support of Precast/Prestressed Concrete Institute, through Daniel P. Jenny research fellowship, and Michigan State University for undertaking this research. Any opinions, findings, conclusions, or recommendations expressed in this paper are those of the author and do not necessarily reflect the views of the institution.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 22, 2015
Accepted: Feb 21, 2017
Published online: May 18, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 18, 2017
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