Study on dynamic multiaxial tension–compression properties of different types of concrete

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Abstract
The mechanical properties of four types of concrete conduced on the same test machine under multi-axial (biaxial tension–compression, triaxial tension–compression–compression) dynamic (strain rate is 10−5s−5, 10−5s−5, 10−5s−5, 10−5s−5) complex stress states with different stress ratios have been compared and analyzed. The current work is mainly to summarize the dynamic multiaxial strength of four different types of concrete and find that the mechanical behavior of four types of concrete has similarities to an extent. The multiaxial dynamic strength of different types of concrete increases with strain rate increases and multiaxial dynamic strength in any direction of four types of concrete is lower than that the concrete static strength under uniaxial tension and compression. The test data indicated that the influence of strain rate and stress ratio on multiaxial dynamic strength of concrete are compared and analyzed. The unified failure criteria expressed in octahedral stress space of various types of concrete under dynamic multiaxial tension and compression was proposed. This investigation provided a theoretical foundation for the design and checking computation of structures subjected to working conditions under multi-axis dynamic loads.