基于应力波传播机理的混凝土无损检测研究综述

混凝土结构在基础设施中应用广泛,但环境与荷载导致材料和结构的老化损伤问题,势必影响材料性能及耐久性和结构完整性及安全性.构建有效的混凝土材料性能评估和结构损伤识别体系是当前研究热点.现有研究因对应力波传播机理不深入理解、损伤定位定量模型理想化、损伤形式简化等问题仍存在局限性.因此,开发普适全面、稳定可靠的无损检测系统,对在建或既有混凝土结构服役状况进行长期、实时跟踪,具有重要学术意义和工程应用价值.本文结合混凝土无损检测领域的国内外研究现状及进展,从智能压电材料振动机理研究、混凝土无损检测方法发展、基于应力波的无损检测研究进展这三个逻辑层面,即按照研究手段到研究方法再到具体研究方案的顺序,循序渐进地对混凝土材料性能评估和结构损伤识别的研究进行了成果总结和方法提炼;基于此进一步概述了该领域所存在的瓶颈问题、研究重难点,最后提出了针对这些局限性的混凝土无损检测研究展望.

Nondestructive Evaluation of Concrete Based on Stress Wave Propagation Mechanism: A Review

Concrete structures are prevalently used in infrastructure, particularly in transportation and hydraulic structures. However, aging and deterioration during service make the structural integrity and safety a ubiquitous problem to be solved. A stable and reliable concrete condition assessment and structural damage identification system is in urgent need. Existing research still has some limitations due to poor understanding of stress wave propagation mechanism, idealization of the damage localization and quantification models, simplification of damage form. Therefore, it is of great academic and engineering significance to develop a comprehensive and reliable nondestructive evaluation system for tracking the service status of concrete structures in a long-term, real-time way. In this paper, combining the current domestic and international research status and progress in the field of concrete nondestructive evaluation and testing, the advances and methodologies of the research on concrete material properties assessment and structural damage identification are systematically reviewed from three aspects: 1) the investigation of vibration mechanism of smart piezoelectric materials, 2) the development of nondestructive evaluation and testing methods for concrete, and 3) the research progress of nondestructive evaluation based on stress waves. The bottleneck problems, the key and difficult challenges in the research field are correspondingly identified. Finally, the research prospects for nondestructive evaluation of concrete with respect to these challenges are proposed.