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A Quantitative Study of the Relationship between Concrete Crack Parameters and Acoustic Emission Energy Released during Failure

机译:破坏过程中混凝土裂缝参数与声发射能量关系的定量研究

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Although acoustic emission (AE) techniques have been extensively studied in concrete engineering and been applied to monitoring structures in service, there has been very little research in relating AE parameters, such as energy, to physical properties such as crack area and crack depth. In this paper a study is performed using mortar specimens to investigate the relationship between AE energy and fracture area and depth. A series of notched mortar specimens of known fracture area and depth, grouted into concrete beams, were loaded to produce instantaneous failure by a shear force. The waveforms created by the failure were monitored by AE sensors attached to the concrete beam. Examination of the waveforms produced by a range of sensors with different frequency responses reveals that the fracture depth affects the AE energy detected during failure. No meaningful relationship between fracture area and AE energy was detected. These results can be used to aid the quantification of crack size based on energy release from concrete structures in the field.
机译:尽管声发射(AE)技术已经在混凝土工程中进行了广泛的研究,并已用于监视在役结构,但在将AE参数(例如能量)与物理特性(例如裂缝面积和裂缝深度)相关联方面,研究很少。在本文中,使用砂浆样本进行了研究,以研究AE能量与裂缝面积和深度之间的关系。将一系列已知断裂面积和深度的凹口砂浆样本灌入混凝土梁中,以使其在剪切力作用下产生瞬时破坏。由故障产生的波形由附着在混凝土梁上的AE传感器监控。对一系列具有不同频率响应的传感器产生的波形进行检查后发现,断裂深度会影响故障期间检测到的AE能量。没有发现骨折面积和AE能量之间有意义的关系。这些结果可用于根据现场混凝土结构释放出的能量来量化裂缝尺寸。

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