作者：吴荣兴^1,2, 于兰珍^1,2, 王海林¹, 李建中¹

作者单位：1. 宁波职业技术学院建工学院, 浙江 宁波 315800;
2. 宁波大学机械与力学学院, 浙江 宁波 315211

关键词：瑞利波;混凝土;弹性模量;检测;波速

摘要：

为获得层状混凝土结构的材料特性,利用瑞利波在半无限大混凝土和层状混凝土中的传播规律,分别建立两种模型中瑞利波传播的波速方程。基于获得的层状混凝土结构中瑞利波的波速方程,提出一种从实测波速来推定混凝土材料特性的反演方法。通过数值计算获得两种模型中波速和混凝土弹性模量的关系曲线,理论计算结果与实验结果基本一致。研究结果表明:由于混凝土层的相互作用,结构中存在多个瑞利波振动模态以及相应的波速,同时波速和上层混凝土弹性模量之间存在对应关系。建立的研究方法和计算结果可直接应用于实际混凝土的瑞利波检测。

Detection of material properties of layered concrete structures using Rayleigh wave

WU Rongxing^1,2, YU Lanzhen^1,2, WANG Hailin¹, LI Jianzhong¹

1. Department of Architectural Engineering, Ningbo Polytechnic, Ningbo 315800, China;
2. School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China

Abstract: In order to obtain the material properties of layered concrete structures, velocity equations for Rayleigh wave of two models are established according to the propagation law of Rayleigh waves in semi-infinite concrete structures and layered concrete structures. Based on the velocity equations obtained in layered concrete structures, an inverse method is proposed to calculate the material properties with the wave velocities measured. The relation curves between wave velocities and the elastic modulus of concrete in the two models are obtained via numerical computation. And the results are similar to the experimental results. The research results show that there are many vibration modes and corresponding velocities in layered concrete structures because of concrete layer interaction, as well as a corresponding relation between wave velocities and the elastic moduli of upper concrete layers. The established research method and its computation results can be directly applied to detect the surface acoustic waves of real concrete.

Keywords: Rayleigh wave;concrete;elastic modulus;detection;wave velocity

2016, 42(3): 32-35  收稿日期: 2015-09-04;收到修改稿日期: 2015-10-28

基金项目: 国家自然科学基金项目(11072116);浙江省教育厅高校访问工程师校企合作项目(FG2014041);宁波职业技术学院青年博士创新项目和科研项目(2013001,NZ14001)

作者简介: 吴荣兴(1982-),男,浙江东阳市人,讲师,博士,主要从事压电声波检测理论和分析。

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