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Computers and Concrete Volume 15, Number 2, February 2015 , pages 199-213 DOI: https://doi.org/10.12989/cac.2015.15.2.199 |
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Influence of softening curves on the residual fracture toughness of post-fire normal-strength concrete |
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Kequan YU and Zhoudao LU
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| Abstract | ||
| The residual fracture toughness of post-fire normal-strength concrete subjected up to 600oCis considered by the wedge splitting test. The initial fracture toughness KIini and the critical fracture toughness KIun could be calculated experimentally. Their difference is donated as the cohesive fracture toughness KIc which is caused by the distribution of cohesive stress on the fracture process zone. A comparative study on determining the residual fracture toughness associated with three bi-linear functions of the cohesive stress distribution, i.e. Peterson\'s softening curve, CEB-FIP Model 1990 softening curve and Xu\'s softening curve, using an analytical method is presented. It shows that different softening curves have no significant influence on the fracture toughness. Meanwhile, comparisons between the experimental and the analytical calculated critical fracture toughness values further prove the validation of the double-K fracture model to the post-fire concrete specimens. | ||
| Key Words | ||
| post-fire; fracture toughness; bi-linear; softening curve; double-K fracture model | ||
| Address | ||
| Kequan YU and Zhoudao LU: College of civil engineering, Tongji University, No.1239 SiPing Road, Shanghai, China | ||