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Table 6 Previous tensile strength equation at/after high-temperature exposure.

From: Prediction of the Tensile Strength of Normal and Steel Fiber Reinforced Concrete Exposed to High Temperatures

Reference Equation Temperature Range Hot/Cooled
Bazant and Chern (1987) − 0.000526 T + 1.01052 20 °C ≤ T ≤ 400 °C
− 0.00252 T + 1.8 400 °C ≤ T ≤ 600 °C
− 0.0005 T + 0.6 600 °C ≤ T ≤ 800 °C
20 °C ≤ T ≤ 800 °C Cooled
Gao et.al (2012) \(\frac{1}{{1 + 8 \times 10^{ - 8} \left( {T - 20} \right)^{2.68} }}\) 20 °C ≤ T ≤ 800 °C Cooled
En1992-1–2 (1992) 1 20 °C ≤ T ≤ 100 °C
1−(\(\frac{{\left( {T - 100} \right)}}{500}\)) 400 °C ≤ T ≤ 600 °C
0 600 °C ≤ T
20 °C ≤ T ≤ 1000 °C Cooled
Chang et al. (2006) 1.05–0.0025 T 20 °C ≤ T ≤ 100 °C
0.8 100 °C < T ≤ 200 °C
1.02–0.0011 T 600 °C < T ≤ 800 °C
20 °C ≤ T ≤ 800 °C Cooled
Xie and Qian (1998) 0.58 \(\times\)(1-\(\frac{T}{300}\)) + 0.42 20 °C ≤ T ≤ 300 °C
0.42 \(\times\)(1.6-\(\frac{T}{300}\)) + 0.42 300 °C ≤ T ≤ 800 °C
20 °C ≤ T ≤ 800 °C Cooled
Li and Guo (1993) 1–0.001 T 20 °C ≤ T ≤ 1000 °C Hot
Khaligh and Waheed (2017) 0.9118–0.0009 T 23 °C ≤ T ≤ 800 °C Hot