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A platform for research: civil engineering, architecture and urbanism
Residual crack extension resistance of post-fire wedge-splitting normal strength concrete specimen based on the cohesive force function
https://orcid.org/0000-0002-8396-4213
Highlights Determine the residual crack extension curves using the analytical and weight function method. Find the influence of temperature and softening curves on the residual crack extension resistance. Implement the stability analysis to judge the stability of crack propagation. Describe the influence of temperature on the crack tip opening displacement.
Abstract A comparative study on determining the crack extension resistance curves (KR-curves) for the complete fracture process associated with two functions of the cohesive stress distribution, i.e. Peterson’s softening curve and CEB-FIP Model, 1990 softening curve using an analytical method and the weight function approach is presented in this paper. Fifty wedge-splitting normal strength concrete specimens were prepared to sustain ten different elevated temperatures up to 600°C. The stress intensity factor curves (K-curves) were calculated from the load–displacement curves obtained on these post-fire specimens. At each temperature, the residual fracture toughness KR(Δa) increased with the crack extension length Δa, whereas the KR-curves became lower and flatter with the increasing heating temperatures Tm. It was found that the KR-curve calculated from the weight function method coincided well with the one from the analytical method, whereas different softening curves had observable effects on the KR-curves. The stability of the KR-curve and the influence of temperatures on the crack tip opening displacement–crack extension curves (CTOD–Δa curves) were also analyzed.
Residual crack extension resistance of post-fire wedge-splitting normal strength concrete specimen based on the cohesive force function
https://orcid.org/0000-0002-8396-4213
Highlights Determine the residual crack extension curves using the analytical and weight function method. Find the influence of temperature and softening curves on the residual crack extension resistance. Implement the stability analysis to judge the stability of crack propagation. Describe the influence of temperature on the crack tip opening displacement.
Abstract A comparative study on determining the crack extension resistance curves (KR-curves) for the complete fracture process associated with two functions of the cohesive stress distribution, i.e. Peterson’s softening curve and CEB-FIP Model, 1990 softening curve using an analytical method and the weight function approach is presented in this paper. Fifty wedge-splitting normal strength concrete specimens were prepared to sustain ten different elevated temperatures up to 600°C. The stress intensity factor curves (K-curves) were calculated from the load–displacement curves obtained on these post-fire specimens. At each temperature, the residual fracture toughness KR(Δa) increased with the crack extension length Δa, whereas the KR-curves became lower and flatter with the increasing heating temperatures Tm. It was found that the KR-curve calculated from the weight function method coincided well with the one from the analytical method, whereas different softening curves had observable effects on the KR-curves. The stability of the KR-curve and the influence of temperatures on the crack tip opening displacement–crack extension curves (CTOD–Δa curves) were also analyzed.
Residual crack extension resistance of post-fire wedge-splitting normal strength concrete specimen based on the cohesive force function
https://orcid.org/0000-0002-8396-4213
Highlights Determine the residual crack extension curves using the analytical and weight function method. Find the influence of temperature and softening curves on the residual crack extension resistance. Implement the stability analysis to judge the stability of crack propagation. Describe the influence of temperature on the crack tip opening displacement.
Abstract A comparative study on determining the crack extension resistance curves (KR-curves) for the complete fracture process associated with two functions of the cohesive stress distribution, i.e. Peterson’s softening curve and CEB-FIP Model, 1990 softening curve using an analytical method and the weight function approach is presented in this paper. Fifty wedge-splitting normal strength concrete specimens were prepared to sustain ten different elevated temperatures up to 600°C. The stress intensity factor curves (K-curves) were calculated from the load–displacement curves obtained on these post-fire specimens. At each temperature, the residual fracture toughness KR(Δa) increased with the crack extension length Δa, whereas the KR-curves became lower and flatter with the increasing heating temperatures Tm. It was found that the KR-curve calculated from the weight function method coincided well with the one from the analytical method, whereas different softening curves had observable effects on the KR-curves. The stability of the KR-curve and the influence of temperatures on the crack tip opening displacement–crack extension curves (CTOD–Δa curves) were also analyzed.
Residual crack extension resistance of post-fire wedge-splitting normal strength concrete specimen based on the cohesive force function
Yu, Kequan (author) / Lu, Zhoudao (author)
Construction and Building Materials ; 54 ; 270-281
2013-12-19
12 pages
Article (Journal)
Electronic Resource
English
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