Triaxial Behavior of Concrete Subjected to Dynamic Compression: Fid-Bau Portal

Triaxial Behavior of Concrete Subjected to Dynamic Compression

Zeng, Shajie / Ren, Xiaodan / Li, Jie

Abstract

Experimental research is presented in this paper to investigate the hydrostatic behavior of concrete under dynamic compression. By using the MTS servohydraulic testing system, strain rates from $10^{- 5}$ to $3.5 \times 10^{- 2} s^{- 1}$ were achieved. A hydrostatic pressure up to the uniaxial compressive strength of concrete was applied to the specimen with the help of the triaxial loading cell. A series of complete stress-strain curves was obtained for the specimens subjected to different combinations of strain rates and confining pressures, and significant enhancements of the material strength were observed. In particular, the experimental results suggest a clear coupling effect between the enhancements induced by the strain rate and the confining pressures. Finally, a set of empirical formulas is proposed to describe the enhancement of the compressive strength of concrete under different strain rates and relatively low confinement levels. The calculated results agree well with the data of the low confining pressure test and could meet the accuracy requirement in engineering design and applications.