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利用MTS-NEW810动态试验机,通过对30根混凝土棱柱体试件施加应力幅值为1 kN到5 kN、频率为5 Hz、应变速率为10~(-4)/s的5组不同循环荷载,研究不同初始损伤对混凝土棱柱体试件动态轴向拉伸特性的影响。研究结果表明,遭受初始损伤程度越严重,混凝土棱柱体试件动态轴向拉伸破坏断面越整齐,且破坏断面粗骨料被拉断数目越少;随着初始损伤程度的增加,混凝土棱柱体试件逐渐产生有不可恢复变形,随着损伤程度的增加,不可恢复变形的增幅明显增大;初始损伤程度对混凝土棱柱体试件动态拉伸应力应变关系曲线上升段影响较小;混凝土棱柱体试件动态轴向拉伸强度和峰值应变均受初始损伤程度影响不大。
By using MTS-NEW810 dynamic testing machine, five different cyclic loads with stress amplitudes of 1 kN to 5 kN, frequency of 5 Hz and strain rate of 10 -4 / s were applied to 30 concrete prismatic specimens , The effect of different initial damage on dynamic axial tensile properties of concrete prism specimens was studied. The results show that the more serious the initial damage is, the nearer the axial section of the concrete prism specimen is damaged, the less the fractured sections are broken. With the increase of the initial damage degree, the concrete prism body The specimens were gradually produced with irreversible deformation. With the increase of damage degree, the increase of unrecoverable deformation increased obviously. The degree of initial damage had little effect on the dynamic tensile stress-strain curve of concrete prism specimens. The concrete prism The dynamic axial tensile strength and peak strain of the specimens are not affected by the initial damage.