In this research,we embedded piezoelectric smart aggregates in Ultra-high Performance Concrete Filled High Strength Steel Tubes(UHPCFHSST)with end ribs.Additionally,piezoelectric ceramic patches were affixed to the external surface of the steel tube.The active wave method was used to monitor the damage at the end of the UHPCFHSST during the reciprocating loading process.The wavelet packet analysis method was employed to analyze the monitoring data,aiming to examine the progression of damage in the core concrete and the occurrence of interface debonding between the tube wall under cyclic reciprocating loading.The results show that the arrival time of the signal in the damaged state is later than in the healthy state,and the amplitude of the signal is lower.Both the damage index of the core concrete and interface debonding increase with escalating loading level and number of loading cycles.Notably,interface debonding transpires prior to internal damage within the core concrete.These damage monitoring results align with the trend of bearing capacity changes in the hysteresis curve and skeleton curve of the specimen.Overall,this study demonstrated the effectiveness of employing piezoelectric smart aggregates and piezoelectric ceramic sensors for monitoring the damage process occurring within concrete-filled steel tubes.
关键词
压电陶瓷/智能骨料/钢管混凝土/地震损伤监测/损伤指数
Key words
piezoelectric ceramics/smart aggregate/concrete filled steel tube/earthquake damage monitoring/damage index
维普
万方数据