Scholarlink

<p>To analyze the crack development characteristics of different reinforced concrete beams in bending, explore the acoustic emission characteristics of beam damage and the degradation of flexural performance, a four-point bending test is used in conjunction with acoustic emission technology. This is employed to establish a link between the bending process and the aforementioned characteristics. The objective is to analyze the acoustic emission signals generated by the three different reinforced concrete beams, namely those with suitable reinforcement, less reinforcement, and over reinforcement, and to simulate and validate the bending process of different reinforced concrete beams using the numerical analysis of the finite element method of Abaqus. The RA-AF signals during the damage evolution process of reinforced concrete beams with different reinforcement ratios show significant differences. The proportion of shear crack signals (RA) in beams with appropriate reinforcement, low reinforcement, and excessive reinforcement is 77.6%, 80.9%, and 78.95%, respectively, which is much higher than that in beams with diagonal tension cracks (AF). The failure of concrete beams is mainly shear failure. The common characteristics of the amplitude distribution of bending damage at various stages of differently reinforced beams are mainly reflected in the amplitude peaks in the frequency bands 4–6&#xa0;kHz, 13.5–16&#xa0;kHz, and 53–57&#xa0;kHz. When the beam reaches a certain load, the amplitude peaks in the high-frequency band will suddenly rise, indicating the yielding of the internal reinforcement of the beam and the entry of the structure into the failure stage. This can be used as an important basis for monitoring the extent of internal damage to the structure through time–frequency transformation of acoustic emission signals. The acoustic emission b<sub>a</sub> value undergoes a sudden change at each stage of beam damage. The b<sub>a</sub> value of the diagonal penetration crack formation stage of the reinforced beam decreases from 1.23 to 0.9, while the b<sub>a</sub> value of the vertical penetration crack formation stage of the less reinforced beam increases. The b<sub>a</sub> value of the concrete collapse stage at the top of the over-reinforced beam decreased from 1.08 to 0.91, while the b<sub>a</sub> value of the diagonal penetration crack formation stage of the purely curved section of the reinforced beam increased from 1.14 to 1.21. This demonstrates the effectiveness of using the acoustic emission b<sub>a</sub> value to conduct a qualitative analysis of the damage process of reinforced beams. This methodology enables the qualitative analysis of the damage process of different reinforced concrete beams using acoustic emission b<sub>a</sub> values.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Acoustic emission characteristics of concrete beam with different reinforcements during bending and damage process

  • 期刊论文

  • 发表日期：

    2025年6月16日

查看全文
  • Dazhong Zhang,
  • Shiyi Zhang,
  • S. M. Chayan,
  • Yingfang Fan,
  • Surendra P. Shah,
  • Junjie Zheng

摘要

To analyze the crack development characteristics of different reinforced concrete beams in bending, explore the acoustic emission characteristics of beam damage and the degradation of flexural performance, a four-point bending test is used in conjunction with acoustic emission technology. This is employed to establish a link between the bending process and the aforementioned characteristics. The objective is to analyze the acoustic emission signals generated by the three different reinforced concrete beams, namely those with suitable reinforcement, less reinforcement, and over reinforcement, and to simulate and validate the bending process of different reinforced concrete beams using the numerical analysis of the finite element method of Abaqus. The RA-AF signals during the damage evolution process of reinforced concrete beams with different reinforcement ratios show significant differences. The proportion of shear crack signals (RA) in beams with appropriate reinforcement, low reinforcement, and excessive reinforcement is 77.6%, 80.9%, and 78.95%, respectively, which is much higher than that in beams with diagonal tension cracks (AF). The failure of concrete beams is mainly shear failure. The common characteristics of the amplitude distribution of bending damage at various stages of differently reinforced beams are mainly reflected in the amplitude peaks in the frequency bands 4–6 kHz, 13.5–16 kHz, and 53–57 kHz. When the beam reaches a certain load, the amplitude peaks in the high-frequency band will suddenly rise, indicating the yielding of the internal reinforcement of the beam and the entry of the structure into the failure stage. This can be used as an important basis for monitoring the extent of internal damage to the structure through time–frequency transformation of acoustic emission signals. The acoustic emission ba value undergoes a sudden change at each stage of beam damage. The ba value of the diagonal penetration crack formation stage of the reinforced beam decreases from 1.23 to 0.9, while the ba value of the vertical penetration crack formation stage of the less reinforced beam increases. The ba value of the concrete collapse stage at the top of the over-reinforced beam decreased from 1.08 to 0.91, while the ba value of the diagonal penetration crack formation stage of the purely curved section of the reinforced beam increased from 1.14 to 1.21. This demonstrates the effectiveness of using the acoustic emission ba value to conduct a qualitative analysis of the damage process of reinforced beams. This methodology enables the qualitative analysis of the damage process of different reinforced concrete beams using acoustic emission ba values.