基于压电陶瓷的钢管混凝土柱早期强度监测  

Study on Early-age Strength Monitoring of Concrete Filled Steel Tube Based on Piezoelectric Ceramic

作　　者：何明星[1,2] 吴方红[1,3] 刘向东[1] 管文强[1] 杜国锋[1] 

机构地区：[1]长江大学城市建设学院,长江大学结构工程与防灾研究所,湖北荆州434023 [2]长江大学基本建设处,湖北荆州434023 [3]武汉大学,湖北武汉430072

出　　处：《压电与声光》2016年第6期979-982,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(51378077);湖北省自然科学基金(创新群体)资助项目(2015CFA029);湖北省教育厅科技计划重点基金资助项目(D20131205)

摘　　要：为研究钢管混凝土柱内部早期强度的增长规律,该文在现有混凝土早期强度监测技术基础上,提出一种基于压电智能骨料的早期强度检测方法。制作钢管混凝土柱试件,通过在钢管混凝土柱内部预埋智能骨料作为传感器和激励器,发射和接收信号,对混凝土早期强度增长过程中传感器采集到的数据进行分析,结果表明,传感器接收信号的电压幅值随着混凝土早期强度的增加而减少,混凝土早期强度在初始的1周内以较快的速度增长,1周后增长速度减慢,28d后强度为1个定值。与此相应,传感器接收信号电压幅值在初始1周内以较快的速度下降,随后下降速度减慢,最后达到稳定,电压幅值变化曲线与早期强度变化曲线相似。利用压电智能骨料能对混凝土早期强度发展过程进行有效监测。In order to study the increasing law of early-age strength in the concrete-filled steel tube columns, a kind of early-age strength monitoring method based on the embedded piezoelectric transducers was put forward on the basis of existing concrete early strength monitoring technology. One concrete filled steel tube column specimen was designed and manufactured. Some smart aggregates for transmitting and receiving signals were pre-buried in concrete-filled steel tube columns as sensor and actuator. The collected signal data from sensors in the process of concrete early-age strength growing were analyzed. The experimental study show that the amplitude of voltage response decreases with development of concrete early strength. The concrete early-age strength increases at a rapid rate in the first week and a slowly rate after the first week. It reaches the peak value after 28 days. Correspondingly, the voltage amplitude drops quickly during the first week and then decreases slowly with hardening of concrete, the variation curves of voltage amplitude matches the curves of concrete early strength. The proposed piezoelectricbased smart aggregate monitoring method can be used to monitor the development process of concrete early strength effectively. The results can provide reference for engineering practice.

关 键 词：压电陶瓷 智能骨料 钢管混凝土 早期强度 监测 

分 类 号：TN06[电子电信—物理电子学] TU317.01[建筑科学—结构工程]