Constitutive Relationships for Normal- and High-Strength Concrete at Elevated Temperatures

ACI - American Concrete Institute
Publication Type:
Journal Article
ACI Materials Journal, 2011, 108 (4), pp. 355 - 364
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In this study, constitutive relationships are developed for normal and high-strength concrete (NSC and HSC) subjected to fire, with the intention of providing efficient modeling and to specify the fire-performance criteria for concrete structures exposed to fire. They are developed for unconfined NSC and HSC specimens that include compressive and tensile strengths, compressive elastic modulus, as well as compressive and tensile stress-strain relationships at elevated temperatures. The proposed relationships at elevated temperature are compared with experimental results and previous existing relationships that it affords to find several advantages and drawbacks of present stress-strain relationships. These results are used to establish more accurate and general compressive and tensile stress-strain relationships. Further experimental results for tension and the other main parameters at elevated temperature are needed in order to establish well-founded models and to improve the proposed constitutive relationships, which are general, rational, and fit well with the experimental results.
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