Shear is the dominant mode of masonry structural failure. A shear test of brick masonry specimen based on acoustic emission (AE) monitoring was performed in this study to assess the damage state of masonry structure reliably. AE parameters and rate-process analysis were used to analyze the damage evolution of brick masonry in shear failure from qualitative and quantitative perspectives. Results showed that variation characteristics of different AE parameters of multiple channels are basically the same throughout the test process. The specimen enters the rapid failure stage when the relative stress reaches 80%. The fourth-order polynomial fitting model between the number of AE events and their corresponding was proposed in this study for quantitative assessment. Analysis of the AE rate-process based on the fourth-order polynomial demonstrated that AE probability density f(V) and damage index D can quantitatively reflect the damage degree of brick masonry in real time.

剪力是砌体结构破坏的主要方式。本研究基于声发射（AE）监测对砖砌体标本进行了剪切试验，以可靠地评估砖砌体结构的破坏状态。从定性和定量的角度，利用声发射参数和速率过程分析法对砖砌体在剪切破坏中的损伤演化进行了分析。结果表明，在整个测试过程中，多个通道的不同AE参数的变化特征基本相同。当相对应力达到80％时，样品进入快速破坏阶段。本研究提出了AE事件数量与其对应事件之间的四阶多项式拟合模型，用于定量评估。f（V）和损伤指数D可以实时定量反映砖砌体的损伤程度。