Piezoelectric Actuator/Sensor Wave Propagation Based Nondestructive Active Monitoring Method of Concrete Structures  

作　　者：朱劲松 

机构地区：[1]School of Civil Engineering,Tianjin University [2]Key Laboratory of Coast Civil Structure Safety(Tianjin University),Ministry of Education

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2011年第3期541-547,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China (No.50708065);the National High-tech R&D Program(863 Program )(No.2007-AA-11-Z-113);the Key Projects in the Science and Technology Pillar Program of Tianjin(No.11ZCKFSF00300)

摘　　要：In order to monitor the basic mechanical properties and interior damage of concrete structures,the piezoelectric actuator/sensor based wave propagation method was investigated experimentally in the laboratory using a specifically designed test setup.The energy attenuation of stress waves was measured by the relative index between the output voltage of sensors and the excitation voltage at the actuator.Based on the experimental results of concrete cube and cylinder specimens,the effect of excitation frequencies,excitation amplitude,wave propagation paths and the curing age on the output signals of sensors are evaluated.The results show that the relative voltage attenuation coefficient RVAC is an effective indicator for measuring the attenuation of stress waves through the interior of concrete.In order to monitor the basic mechanical properties and interior damage of concrete structures,the piezoelectric actuator/sensor based wave propagation method was investigated experimentally in the laboratory using a specifically designed test setup.The energy attenuation of stress waves was measured by the relative index between the output voltage of sensors and the excitation voltage at the actuator.Based on the experimental results of concrete cube and cylinder specimens,the effect of excitation frequencies,excitation amplitude,wave propagation paths and the curing age on the output signals of sensors are evaluated.The results show that the relative voltage attenuation coefficient RVAC is an effective indicator for measuring the attenuation of stress waves through the interior of concrete.

关 键 词：piezoceramics actuator/sensor wave propagation method non-destructive evaluation （NDE） active monitoring concrete 

分 类 号：TU375[建筑科学—结构工程] U225.3[交通运输工程—道路与铁道工程]