Stress-Strain Relationships for Preloaded Concrete at High Temperatures

Publication Type:
Conference Proceeding
Structural Engineers World Congress 2011, 2011, pp. 1 - 12
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Structural fire-safety capacity of concrete is very complicated because concrete materials have considerable variations. Stress-strain relationships for preloaded normal and high strength concrete (NSC and HSC) subjected to fire are needed, which are intended to provide efficient modeling and to specific fire-performance criteria of the behavior of preloaded concrete structures exposed to fire. In this paper, formulations for estimating the parameters affecting the behavior of unconfined preloaded concrete at high temperatures are developed. These formulations include residual compression strength, initial modulus of elasticity, peak strain, thermal strain, transient creep strain and compressive stress-strain relationship at elevated temperatures. The developed stress-strain relationships are verified with available experimental data and existing models. The developed relationships are general, rational, and have good agreement with the experimental data.
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