【摘要】 针对混凝土结构裂缝损伤,探索一种基于压电波动法的裂缝损伤监测方法。分析了混凝土裂缝对应力波的作用机理,以此为基础提出了损伤程度的判别方法,同时结合混凝土结构的特点,以传感器列阵作为损伤近似定位的方法。最后,针对不同类型的混凝土试件,开展了验证性试验。将压电传感器以智能骨料的形式成对的埋置在混凝土构件内部对其在裂缝损伤发展状况进行监测。其中一个传感器用于发射信号,另一个用于接收信号,依据提出的损伤识别方法对试件损伤进行监测识别。监测试验结果与试件损伤实际情形相吻合。结果表明:所提出方法能很好地揭示损伤的发展趋势,可用于混凝土结构服役期间的裂缝损伤监测。更多还原

【Abstract】 A method based on piezoceramic transducers and a wave analysis method was developed for monitoring crack damage of concrete structures.The monitoring mechanism how crack influences the stress wave propagating in concrete was analyzed.A discriminate method for damage degree was proposed and a damage approximate locating method based on a transducer array was employed according to the characters of civil engineering structures.At last,a validation test was conducted for different reinforced concrete members with the proposed method.Piezoelectric sensors were buried into concrete in form of smart aggregates in pairs.One sensor was used to transmit signals and the other to receive the signals.The damages were monitored and identified by the proposed method.The test results were agreed with the situation of crack damages.It indicates that the proposed method could reflect the developing tendency of damage well and it is suitable to be used for service state mornitoring of concrete structures.更多还原