Different initial damage on dynamic axial tensile strength of concrete

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (17) : 117-120.

Fan Xiangqian1,2 Hu Shaowei1,2,3 Lu Jun1,2 Chen Qiyong3

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Abstract

In order to study the different initial damage’s influence on the dynamic axial tensile strength of concrete, the experiment was carried out by 5 groups of concrete prism specimens, under the condition of the same initial load variation range (1kN to 5kN), the same frequency(5Hz), the same strain loading rate(10-4/s), and the different cycles of initial damage, by using advanced MTS-NEW810 dynamic testing machine. The results show that: when the initial damage degree of concrete prism is increased, the fracture section is more smooth and the number of broken coarse aggregates is reduced; with the initial damage level increasing, some irreversible deformations appear in the concrete specimens, and the irreversible deformation is greater than the lighter initial damage’s. The initial damage doesn’t affect the rising step of stress-strain relationship curve obviously. The initial damage has little influence on the dynamic axial tensile strength value and the peak strain as well.

Key words

concrete / cyclic loading / initial damage / uniaxial tension / dynamic test

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Fan Xiangqian1,2 Hu Shaowei1,2,3 Lu Jun1,2 Chen Qiyong3. Different initial damage on dynamic axial tensile strength of concrete[J]. Journal of Vibration and Shock, 2016, 35(17): 117-120

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