钢筋混凝土梁受剪破坏全过程声发射特征

Acoustic emission characteristics of reinforced concrete beams in the whole process of shear failure

为了探究钢筋混凝土梁在受剪破坏过程中的声发射特征演化规律,以粗骨料粒径和剪跨比为变量,利用声发射技术对5根钢筋混凝土简支梁受剪破坏全过程中的声发射特征参数进行动态分析,利用声发射b值对构件的损伤情况进行定量分析。研究结果表明:随着加载进程的进行,钢筋混凝土受剪梁声发射事件数和b值受不同剪跨比和粗骨料粒径的影响,其变化趋势基本相同;声发射累计事件数随剪跨比的增大而增大,随粗骨料粒径的增大而减小;声发射b值可较为准确地反映受剪梁在各个阶段的损伤状况,可为钢筋混凝土受剪梁的损伤演化研究提供借鉴与参考。

In order to explore the evolution of acoustic emission characteristics of reinforced concrete beams during shear failure process,taking coarse aggregate particle size and shear span ratio as variables,using acoustic emission technology,the acoustic emission characteristic parameters of five simply-supported reinforced concrete beams in the whole process of shear failure were analyzed dynamically.The b-value of acoustic emission was used to quantitatively analyze the damage of components.Research indicates that the number of acoustic emission events and b-value of reinforced concrete beams with different shear span ratios and coarse aggregate particle sizes had basically the same changing trends with the loading process.The cumulative number of acoustic emission events increased with the increase of shear span ratio,and decreased with the increase of aggregate particle size.The acoustic emission b-value can more accurately reflect the damage status of the beam at various stages,and provide reference for the research on the damage evolution of reinforced concrete beams.