Abstract
The mechanical properties of concrete under cyclic tensile loading using square waveform, sine waveform and ramp waveform are studied. The experiments are performed on a closed-loop electro-hydraulic servo-controlled material testing system (MTS). The axial strain, dissipated energy per loading cycle, the damage evolution law and deformation modulus are mainly studied. The results show that the three-stage evolution law of axial strain and damage variable of concrete under ramp waveform and sine waveform are more obvious than those under the square waveform. The dissipated energy changes at different stages of fatigue life. At the beginning and end of the fatigue life, the rate of dissipated energy is higher than that at the medium stage of the fatigue time, which is attributed to the formation of cracks. The evolution of deformation modulus of concrete subjected to cyclic tensile loading using three loading waveforms also shows three stages: fast increase in the damage—increase at a slow constant rate—and accelerated increase in damage until failure.
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The authors would like to acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 51509078) and Natural Science Foundation of Jiangsu Province (Grant No. BK20150820) and the Fundamental Research Funds for the Central Universities (2016B06014) granted to the corresponding author Xudong Chen.
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Chen, Y., Chen, X. & Bu, J. Mechanical properties of concrete to cyclic uniaxial tensile loading using variable waveforms. Sādhanā 42, 111–117 (2017). https://doi.org/10.1007/s12046-016-0579-3
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DOI: https://doi.org/10.1007/s12046-016-0579-3