浆骨比对混凝土梁声发射信号的影响  

Influence of slurry-aggregate ratio on acoustic emission signal of concrete beam

作　　者：虞爱平 李翔昊[1] 刘祥泰 丁俊业 钟展明 陈宣东 YU Aiping;LI Xianghao;LIU Xiangtai;DING Junye;ZHONG Zhanming;CHEN Xuandong(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin 541000,China;College of Civil and Architectural Engineering,Guilin University of Technology,Guilin 541000,China)

机构地区：[1]广西岩土力学与工程重点实验室,广西桂林541000 [2]桂林理工大学土木与建筑工程学院,广西桂林541000

出　　处：《混凝土》2024年第2期39-44,共6页Concrete

基　　金：国家自然科学基金(51968014);广西创新驱动发展专项项目(桂科AA20302006)。

摘　　要：为研究弹性波在不同浆骨比混凝土内部传播的衰减特性,设计了3组不同浆骨比混凝土梁,提取模拟断铅声发射信号,进行声发射信号特征参数分析及频谱分析。结果表明:3组试件的幅值、能量、信号强度均会随传播距离的增加而呈现指数函数衰减,且衰减系数b因浆骨比的提高均有所下降;能量参数对于浆骨比变化的敏感程度最大,信号强度和幅值依次降低;随着浆骨比的提高,在Sensor1#~Sensor3#的峰值频率衰减程度呈现出逐渐递减的趋势。In order to study the attenuation characteristics of elastic wave propagation in concrete with different slurry-aggregate ratio,three groups of concrete beams with different slurry-aggregate ratio were designed.The acoustic emission signals of simulated lead breaking were extracted,and the characteristic parameters and spectrum analysis of acoustic emission signals were carried out.The results show that the amplitude,energy and signal strength of the three groups of specimens decrease exponentially with the increase of propagation distance,and the attenuation coefficient b decreases with the increase of slurry-aggregate ratio.The energy parameters are most sensitive to the change of slurry-aggregate ratio,and the signal intensity and amplitude decrease in turn.With the increase of slurry-aggregate ratio,the attenuation of peak frequency between Sensor 1#and Sensor 3#shows a decreasing trend.

关 键 词：混凝土 浆骨比 声发射 衰减规律 

分 类 号：TU528.01[建筑科学—建筑技术科学]