不同缝高比混凝土梁试件三点弯曲断裂声发射特性研究

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发布时间：2020-01-06 00:00:00

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不同缝高比混凝土梁试件三点弯曲断裂声发射特性研究

Acoustic Emission Characteristics of Three-point Bending Fracture of Concrete Beam Specimen with Different Notch-to-depth Ratio

2021年第11期

混凝土梁；缝高比；声发射；断裂参数；裂缝扩展

Concrete beam; Notch-to-depth ratio; Acoustic emission; Fracture parameter; Crack propagation

2021年第11期

10.19761/j.1000-4637.2021.11.006.06

国家自然科学基金青年科学基金项目（51509078）。

王宁，石丹丹

河海大学，江苏南京 210024

王宁，石丹丹

王宁,石丹丹.不同缝高比混凝土梁试件三点弯曲断裂声发射特性研究[J].混凝土与水泥制品,2021(11):6-11.

WANG N,SHI D D.Acoustic Emission Characteristics of Three-point Bending Fracture of Concrete Beam Specimen with Different Notch-to-depth Ratio[J].China Concrete and Cement Products,2021(11):6-11.

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摘要：结合声发射技术，针对四种缝高比（0.2、0.3、0.4、0.5）的混凝土梁试件开展了单调三点弯曲断裂试验，探究了混凝土梁的断裂特性和裂缝扩展机理，对比研究了不同缝高比对混凝土梁断裂力学特性的影响。试验结果表明，混凝土梁试件的峰值荷载会随着缝高比的增大而降低。随着缝高比的增大，试件裂缝张开口位移临界值增大，而失稳断裂韧度和断裂能均减小。加载过程中，声发射参数累计值均随缝高比的减小而增大，但平均值无明显变化规律。基于单位时间声发射撞击数的变化，将试件单调断裂加载过程划分为三个阶段，并给出了基于声发射信号强度分析的混凝土结构安全区域。 Abstract: The monotonic three-point bending tests were carried out for the concrete beam specimens with the different notch-to-depth ratios (0.2, 0.3, 0.4, 0.5) by combining with acoustic emission technique. The fracture characteristics and crack propagation mechanism of concrete beam specimens were explored, and the effect of notch-to-depth ratios on the fracture mechanical properties of concrete beam was investigated. The experimental results show that the increase of notch-to-depth ratio can lead to the decrease of peak load. With the increase of notch-to-depth ratio, the critical crack opening displacement of the concrete beam specimen increases, but the instability fracture toughness and fracture energy both decrease. During the loading process, the cumulative values of acoustic emission parameters increase with the decrease of the notch-to-depth ratio, but the average values have no obvious change rule. Based on the change of acoustic emission hits per unit time, the monotonic fracture loading process of concrete beam specimens can be divided into three stages. In addition, the safe area is given according to the analysis of acoustic emission signal intensity.

英文名 : Acoustic Emission Characteristics of Three-point Bending Fracture of Concrete Beam Specimen with Different Notch-to-depth Ratio

刊期 : 2021年第11期

关键词 : 混凝土梁；缝高比；声发射；断裂参数；裂缝扩展

Key words : Concrete beam; Notch-to-depth ratio; Acoustic emission; Fracture parameter; Crack propagation

刊期 : 2021年第11期

DOI : 10.19761/j.1000-4637.2021.11.006.06

文章编号 :

基金项目 : 国家自然科学基金青年科学基金项目（51509078）。

作者 : 王宁，石丹丹

单位 : 河海大学，江苏南京 210024

王宁，石丹丹

王宁,石丹丹.不同缝高比混凝土梁试件三点弯曲断裂声发射特性研究[J].混凝土与水泥制品,2021(11):6-11.

WANG N,SHI D D.Acoustic Emission Characteristics of Three-point Bending Fracture of Concrete Beam Specimen with Different Notch-to-depth Ratio[J].China Concrete and Cement Products,2021(11):6-11.

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摘要

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引用本文

Abstract: The monotonic three-point bending tests were carried out for the concrete beam specimens with the different notch-to-depth ratios (0.2, 0.3, 0.4, 0.5) by combining with acoustic emission technique. The fracture characteristics and crack propagation mechanism of concrete beam specimens were explored, and the effect of notch-to-depth ratios on the fracture mechanical properties of concrete beam was investigated. The experimental results show that the increase of notch-to-depth ratio can lead to the decrease of peak load. With the increase of notch-to-depth ratio, the critical crack opening displacement of the concrete beam specimen increases, but the instability fracture toughness and fracture energy both decrease. During the loading process, the cumulative values of acoustic emission parameters increase with the decrease of the notch-to-depth ratio, but the average values have no obvious change rule. Based on the change of acoustic emission hits per unit time, the monotonic fracture loading process of concrete beam specimens can be divided into three stages. In addition, the safe area is given according to the analysis of acoustic emission signal intensity.

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不同缝高比混凝土梁试件三点弯曲断裂声发射特性研究

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