Mechanical Responses of Steel Fiber–Reinforced Concrete after Exposure to High Temperature: Experiments and Mesoscale Discrete Modeling
Publication: Journal of Engineering Mechanics
Volume 147, Issue 11
Abstract
The mechanical responses of steel fiber–reinforced concrete (SFRC) thermally damaged at high temperature needs a deeper evaluation via a mesoscopic model that explicitly treats the fibers. For this demand, the lattice discrete particle model for SFRC after high temperature (LDPM-F-HT) is formulated. A series of experimental tests for SFRC with 0%, 1%, and 2% of steel fiber volume fraction with different heating treatments are performed to calibrate and validate the LDPM-F-HT. It is found that the nonmonotone decreasing of the macroscopic compressive strength up to 400°C is caused by the slower thermal degradation of shear strength than that of tensile strength at the mesoscale. The good matches between the experimental and numerical results demonstrate that LDPM-F-HT can capture also this phenomenon. In the numerical simulation of three-point bending tests, it is observed that the dimension of the fracture process zone (FPZ) at load peak increases with the increase of fiber content and heating temperatures. However, the FPZ width in SFRC reaches its maximum value after the thermal treatment of 450°C rather than 600°C.
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Data Availability Statement
All experiemtal and numerical data and the part of the high-temperature module code supporting the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research was supported by the National Natural Science Foundation of China (51908195, 51979092) and the Fundamental Research Funds for the Central Universities (B200202125). The experiment was supported by the National Key Research and Development Program of China (2018YFC0406703) and China Postdoctoral Science Foundation (2020T130170). This simulation was supported by the National Natural Science Foundation of China (11902161) and 6th Regular Session Personnel Exchange Program of North Macedonia–China Committee for Scientific and Technological Cooperation (6-10).
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Published In
Journal of Engineering Mechanics
Volume 147 • Issue 11 • November 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Feb 2, 2021
Accepted: May 27, 2021
Published online: Aug 19, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 19, 2022
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