Md Nor Noorsuhada, Abdullah Shahrum, Mohamad Halim Mohamad Afiq Hazwan, Arifin Azli
Civil Engineering Studies, College of Engineering, Universiti Teknologi MARA, Cawangan Pulau Pinang, Kampus Permatang Pauh, Permatang Pauh 13500, Malaysia.
Department of Mechanical and Manufacturing Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
Materials (Basel). 2023 Mar 8;16(6):2172. doi: 10.3390/ma16062172.
The behaviour of the steel bar in concrete under cyclic loading has been evaluated using magnetic flux leakage associated with acoustic emission monitoring technique. Visual observation was used to observe the deformation of the beam under cyclic loading. The sensors of metal magnetic memory were scanned in the middle of the beam at a distance of 320 mm at the bottom part. Twenty-two cyclic ranges were performed for cyclic loading of 100 or 200 cycles for each range, with a frequency of 1 Hz and a sinusoidal wave mode. The magnetic flux leakage signal, acoustic emission characteristics and crack width were measured and analysed to evaluate the behaviour of the steel bar in the concrete beam. The magnetic flux leakage signal and acoustic emission energy results were well matched with the occurrence of cracks at the centre of the beam. It was found that the relationship between the magnetic leakage flux signal and crack opening showed a strong correlation with R of 0.969. A high acoustic emission energy of 1300 nVs is observed at the centre of the beam. Based on the results, the behaviour of the steel in the concrete beam can be determined by the integrity assessment of a structure.
利用与声发射监测技术相关的漏磁通量评估了循环加载下混凝土中钢筋的行为。通过目视观察来观测梁在循环加载下的变形情况。金属磁记忆传感器在梁底部中间距离为320 mm处进行扫描。对每个循环范围进行了22次循环加载，每次循环范围为100或200次循环，频率为1 Hz，采用正弦波模式。测量并分析了漏磁通量信号、声发射特性和裂缝宽度，以评估混凝土梁中钢筋的行为。漏磁通量信号和声发射能量结果与梁中心裂缝的出现情况吻合良好。发现漏磁通量信号与裂缝开度之间的关系具有很强的相关性，相关系数R为0.969。在梁中心观察到1300 nVs的高声发射能量。基于这些结果，可以通过结构完整性评估来确定混凝土梁中钢筋的行为。
