Eighth Congress on Forensic Engineering
Evaluation of Fire Effects on Precast, Prestressed Concrete Members
Publication: Forensic Engineering 2018: Forging Forensic Frontiers
ABSTRACT
Exposure of concrete members to high temperatures can affect the structural performance of concrete and embedded reinforcement in numerous ways including changes in material properties, loss of strength, and relaxation of prestressing forces in pre-stressed concrete members. The assessment of concrete members exposed to high temperatures follows both testing and analytical methods. A typical evaluation may include non-destructive testing, destructive testing, evaluation of fire intensity, determination of temperature profiles, and assessment of residual strength and prestressing losses. This paper includes the authors’ experience with the assessment of prestressed double-tee beams in parking garages that have been exposed to fire and high temperatures. The authors discuss both general information associated with the evaluation process (and review of relevant, published literature) as well as considerations specific to the presented case studies. These include consideration of effects of high temperatures on localized components of the double-tees, as well as potential remedial repairs.
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REFERENCES
American Concrete Institute. 2010. ACI 214.4R-10: Guide for Obtaining Cores and Interpreting Compressive Strength Results. Farmington Hills: American Concrete Institute.
American Concrete Institute. 2014. ACI 216.1-14: Code Requirements for Determining Fire Resistance of Concrete and Masonry Construction Assemblies. Farmington Hills: American Concrete Institute.
American Society of Testing and Materials. 2017. ASTM C856-17: Petrographic Examination of Hardened Concrete. West Conshohocken.
Atienza, J.M., and M. Elices. 2009. "Behavior of Prestressing Steel after a Simulated Fire: Fire-Induced Damages." Construction and Building Materials.
Bazant, Z.P., and Q. Yu. 2013. "Relaxation of Prestressing Steel at Varying Strain and Temperature: Viscoplastic Constitutive Relation." ASCE Journal of Engineering Mechanics 139 (7).
EN, BS. 2004. 1-2: 2004 Eurocode 2: Design of Concrete Structures - Part 1-2: General Rules - Structural Fire Design. London: European Standards.
The Concrete Society. 2008. Technical Report No. 68: Assessment, Design, and Repair of Fire-Damaged Concrete Structures. Camberley: The Concrete Society.
Information & Authors
Information
Published In
Forensic Engineering 2018: Forging Forensic Frontiers
Pages: 396 - 407
Editors: Rui Liu, Ph.D., Kent State University, Michael P. Lester, Element Analytical, Alicia E. Díaz de León, and Michael J. Drerup
ISBN (Online): 978-0-7844-8201-8
Copyright
© 2018 American Society of Civil Engineers.
History
Published online: Nov 27, 2018
Published in print: Nov 27, 2018
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