压电陶瓷片/混凝土复合机敏结构中的表面波法  

Surface Wave Method in Piezoceramic Patches/Concrete Smart Structure

作　　者：孙明清[1] W.J.Staszewski R.N.Swamy 李卓球[1] 

机构地区：[1]武汉理工大学工程结构与力学系,湖北武汉430070 [2]Department of Mechanical Engineering, Sheffield University

出　　处：《建筑材料学报》2004年第2期145-149,共5页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50209013;50238040)

摘　　要：将PZT压电陶瓷片直接粘贴在混凝土表面,产生和接收表面波,以确定沿混凝土表面传播的Rayleigh波和纵波的波速,以及混凝土的动弹性模量和动泊松比.研究表明,表面波法简单可行;Rayleigh波在50～80kHz的频率范围内呈频散状态,即该波波速随频率的变化而变化;混凝土柱在轴向加载情况下,Rayleigh波和纵波峰峰值均随应力增加而减小,并且卸载后波形不能回复,波速略有减小.压电陶瓷片/混凝土复合机敏结构中的表面波法对实时监测混凝土性能劣化和裂纹等具有重要意义.Two PZT patches were bonded on the surface of concrete prisms to launch and receive ultrasonic surface wave. Then the velocity of P wave, the velocity of Rayleigh wave, the dynamic modulus of elasticity and Poisson's ratio of concrete were determined. Results show that surface wave method is a simple, feasible method. And the dispersion of Rayleigh wave is observed in the range of 50～80 kHz, that is, the velocity of Rayleigh wave depends on the frequency. When concrete prisms are compressed axially, the peak-to-peak amplitude of P wave and Rayleigh wave both decrease with increasing stress. After unloading, waveforms can not recover to their initial states, and the velocity decreases slightly. Piezoceramic patches/Concrete smart structures have potential to realize real time monitoring of deterioration and cracking of concrete structures.

关 键 词：压电陶瓷 表面波法 混凝土结构 动弹性模量 机敏混凝土 

分 类 号：TU375[建筑科学—结构工程]