基于嵌入式压电材料的不规则多腔钢管混凝土缺陷监测及谱元法机理研究

项目名称： 基于嵌入式压电材料的不规则多腔钢管混凝土缺陷监测及谱元法机理研究

项目编号： No.51278185

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 许斌

作者单位： 湖南大学

项目金额： 85万元

中文摘要： 我国超高层建筑建设正处于快速发展期。钢管混凝土以其优良的结构性能在超高层建筑中的应用日益广泛，且截面大并呈多腔组合趋势发展。大型复杂不规则多腔钢管混凝土构件中大体积混凝土缺陷以及钢管壁与核心混凝土界面粘结性能的监测与评估是亟待解决的课题，传统手段如超声波法无法适用。本项目将充分发挥压电陶瓷智能材料的优势，研发基于压电陶瓷的嵌入式压电智能块，提出基于应力波传播的复杂不规则多腔钢管混凝土缺陷监测新方法；在研究混凝土以及钢-混凝土组合构件中应力波传播特性的基础上，开展不同截面型式和不同缺陷的单腔钢管混凝土缩尺比例构件和复杂多腔钢管混凝土足尺构件的系统试验，探讨所提出的方法对不同缺陷形式和程度识别能力；基于监测信号的功率谱、小波包能量以及小波包能量谱分析结果定义新型损伤指标，探讨不同信号类型和频率下对损伤的分辨能力以及嵌入式压电智能块的布置方案和原则；运用谱元法进行数值模拟揭示其物理机理。

中文关键词： 压电陶瓷；钢管混凝土；损伤检测；应力波；界面剥离损伤

英文摘要： Currently, the construction of super high-rise building structures in China is developing very quickly. Due to its perfect mechanical behavior, the Concrete Filled Steel Tubes (CFSTs) have been widely employed in super high-rise building structures, and the cross section of the CFSTs becomes larger with a complicated multi-box shape. The development of efficient detection methodology for concrete core defects and the interface debonding damage between concrete core and steel tube of large scale complicated irregular CFSTs is very crucial because most of the current available nondestructive technologies including ultrasonic method are unsuitable for them. In this study, a piezoelectric ceramic material based on embedded piezo intelligent block (EPIB) is developed firstly and a novel concrete defects and the interface debonding damage detection approach is proposed based on the stress wave propagation. The developed EPIBs are employed to investigate the characters of stress wave propagation in concrete and steel-concrete composite members. Then, series experimental study on the concrete core defects and the interface debonding damage detection for single-box CFST scale models and complicated irregular multi-box CFSTs is carried to verify the detectability of the proposed approach. Based on the energy spectrum anal

英文关键词： piezoelectric ceramic；Concrete-Filled Steel Tubular；damage detection；stress wave；interfacial debonding defect