Mechanical properties of plain high-strength high-performance concrete under biaxial compression after exposure to high temperatures

作者：He Zhenjun^*; Song Yupu

来源：Chinese Journal of Theoretical and Applied Mechanics, 2008, 40(3): 364-374.

• High strength high performance concrete
• High temperatures
• Stress ratios
• Stress strain relationship
• Uniaxial and biaxial compressive strength

This study aims to generate the mechanical response of plain high-strength high-performance concrete (HSHPC) subjected to biaxial compressive loading at seven stress ratios, α = σ2:σ3, -0.00:-1, -0.20:-1, -0.30:-1, -0.40:-1, -0.50:-1, -0.75:-1, -1.00:-1, after exposure to the temperature of 20°C, 200°C, 300°C, 400°C, 500°C and 600°C, using the true-triaxial loading system. The biaxial static compressive strengths, strains at the peak stress and the stress-strain curves are obtained to analyze the influence of the temperature and the stress ratio. Failure modes of plain HSHPC specimens are observed. The experimental results show that the biaxial compressive strength of HSHPC is more sensitive to the stress ratio and the exposure treatment to high temperatures than the uniaxial compressive strength. The Kupfer-Gerstle failure criterion for plain HSHPC is developed with the parameters of the temperature and stress ratio.

• 出版日期2008