不同初始损伤混凝土动态轴向拉伸试验研究

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (17) : 117-120.

论文

不同初始损伤混凝土动态轴向拉伸试验研究

范向前1,2，胡少伟1,2,3，陆俊1,2，陈启勇3

作者信息 +

Different initial damage on dynamic axial tensile strength of concrete

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

Author information +

文章历史 +

摘要

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1kN到5kN、频率为5Hz、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。

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.

导出引用

范向前1,2，胡少伟1,2,3，陆俊1,2，陈启勇3. 不同初始损伤混凝土动态轴向拉伸试验研究[J]. 振动与冲击, 2016, 35(17): 117-120

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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