摘要
目的利用压电陶瓷波动法并结合时间反转技术对钢管混凝土构件的密实性进行检测,以弥补已有技术对于混凝土密实性检测需健康信号作对比的不足.方法将压电陶瓷预埋在小体积混凝土中,制成具有发射和接收双重功能的"智能骨料",并预埋在钢管混凝土中的指定位置.对比原始信号与重构信号,并引入指标TR和SYM评价两者之间的差异,从而实现混凝土的密实性判定.结果对于试验中不同类型和不同大小的缺陷,密实性评价指标TR和SYM能够准确识别.根据试验推断出人工缺陷的相对大小与实际情况相符.结论笔者提出的方法能有效地检测钢管混凝土的密实性,应用于实际工程切实可行.
A new method was proposed in the paper to detect the compactness of concrete filled steel tube columns （CFSTC） based on piezoelectric ceramic wave method which combined with time reversal technol- ogy. Five rectangular CFSTCs were made with artificial defects or not, respectively. Piezoelectric ceramics patch was embedded into a small volume of concrete to make smart aggregate with dual functions of actua- tion and sensing, and the smart aggregate was placed into the given position in the CFSTCs. A group of the smart aggregates were used to actuate a detection signal and the other to receive. At the same time, the re- ceived response signal was reversed in the time domain and applied back again. For the description of the compactness level of concrete, two indices of time reversibility （TR） and symmetry （SYM） indices are pro- posed in the paper to detect the compactness of concrete. The experimental results show the feasibility of this method, and the location and the range of the damage can be expressed well by the defined two indices and it is possible to be used in civil engineering.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2013年第5期788-795,共8页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51278313)
辽宁省自然科学基金项目(201202180)
辽宁省教育厅科学研究项目(L2012214)
2012年鞍钢建设集团有限公司科研项目
关键词
钢管混凝土
时间反转法
密实性指标
智能骨料
结构健康监测
concrete-filled steel tube
time reversal method
compactness indexes
piezoelectric smart aggre-gate
structure health monitoring
