
钢筋混凝土柱加载试验AE监测研究
AE monitoring for the loading test of reinforced concrete column
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.
声发射 / b值 / 加载速率 / 损伤评估 {{custom_keyword}} /
acoustic emission / b-value / loading rate / damage evaluation {{custom_keyword}} /
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