钢筋混凝土柱加载试验AE监测研究

李 旭;霍林生;李宏男

振动与冲击 ›› 2014, Vol. 33 ›› Issue (20) : 12-15.

PDF(1788 KB)
PDF(1788 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (20) : 12-15.
论文

钢筋混凝土柱加载试验AE监测研究

  • 李 旭 ,霍林生,李宏男
作者信息 +

AE monitoring for the loading test of reinforced concrete column

  • LI Xu,HUO Lin-sheng,LI Hong-nan
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摘要

利用声发射(Acoustic Emission, AE)技术分析动、静态加载下钢筋混凝土柱的断裂、损伤特性。用40 mm/s,0.1mm/s两加载速率分别进行钢筋混凝土柱多维循环加载试验。据AE的b值理论捕捉宏观裂纹开始拓展时刻荷载状况,提出用定义宏观开裂发生荷载与极限荷载之比评估钢筋混凝土结构损伤;并对比分析动、静态加载实验中钢筋混凝土柱宏观裂纹初始荷载状况与损伤增长速率。结果表明,利用b值理论即声发射信号幅值分布变化,能捕捉到钢筋混凝土柱裂纹宏观拓展时刻;与静态加载相比动态加载时宏观裂纹的形成所需荷载更小,动态加载更易导致宏观裂纹形成;AE事件累计时间参数能清晰反映钢筋混凝土柱的损伤增长速率,且加载速率高的构件损伤速率高于加载速率低的构件,高加载速率更易导致、加剧结构损伤。

Abstract

The focus of this paper is to analysis the fracture and damage characterize of reinforced concrete (RC) column subject to dynamic and static loading based on acoustic emission (AE) technique. The multi-dimensional dynamic/static loading test of RC columns is conducted with the loading rate of 40mm/s and 0.1mm/s respectively. By b-value analysis, the moment of macro-crack opening is acquired, and by which, the ratio of macro-crack opening load to maximum load is proposed to evaluate the damage condition. In addition, the load condition and damage accumulative rate of RC column subject to both dynamic and static loading are analyzed. The results are shown that: the distribution of AE amplitude, which also can be seen as b-value, can capture the moment of macro-crack opening in RC column. The macro-crack subject to dynamic loading needs smaller external load compared with the one subjected to static loading. The dynamic loading is more likely to lead the formation of macro-crack. The time parameter of AE event accumulation can clearly reflect the damage accumulate rate of RC column. Moreover, the damage accumulate rate in high loading rate specimen is larger than the one in loading rate specimen. And the high loading rate is more easily to make and aggravate the structural damage.

关键词

声发射 / b值 / 加载速率 / 损伤评估

Key words

acoustic emission / b-value / loading rate / damage evaluation

引用本文

导出引用
李 旭;霍林生;李宏男. 钢筋混凝土柱加载试验AE监测研究[J]. 振动与冲击, 2014, 33(20): 12-15
LI Xu;HUO Lin-sheng;LI Hong-nan. AE monitoring for the loading test of reinforced concrete column [J]. Journal of Vibration and Shock, 2014, 33(20): 12-15

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