摘要
底部接缝作为装配式剪力墙结构中的典型构造,空间狭窄,施工过程中易产生空洞、不密实等隐藏缺陷。为了实现对预制剪力墙底部接缝施工缺陷的有效检测,采用数值模拟和试验的方法,对超声纵波不同检测方式进行研究。通过理论分析单面平测法和穿透式对测法对不同缺陷的识别能力,旨在选取合适的检测方式和参数对底部接缝施工缺陷进行快速检测,并通过实验室试件检测和工程应用进行验证。研究结果表明:单面平测法和穿透式对测法均可以有效识别底部接缝中的施工缺陷,纵波直达波信号幅值变化幅度较传播速度大,首选其作为判断缺陷的指标。单面平测法适用于整条底部接缝的快速检测,穿透式对测法适用于局部抽检。现场检测时,可综合两种检测方式的优势,实现底部接缝缺陷的快速精细化识别。
As a typical structure of the prefabricated shear wall buildings,the bottom joint with characteristic of narrow space is prone to hidden defects such as void and leakiness during the process of construction.To achieve effective detection of construction defects in the bottom joint of the prefabricated shear wall structure,both numerical simulation and experimental methods were used to study different detection methods based on the ultrasonic longitudinal wave.Theoretical analysis of the recognition capability of single-side testing method and penetration testing method for different defects in the bottom joints was conducted to select appropriate testing methods and parameters for the rapid detection of construction defects,then the laboratory specimen testing and engineering application were adopted to verify the theoretical analysis results.The results showed that both the single-side testing method and penetration testing method could effectively identify the construction defects in the bottom joints.The variation amplitude of the direct wave of longitudinal wave at the defect location was larger than the corresponding value of the propagation speed,therefore,the signal amplitude of the direct wave was preferred as the primary indicator for judging the defect.The single-side testing method is suitable for the rapid detection of the entire bottom joint,while the penetration testing method is referred to spot-check.During the field detection,advantages of the two testing methods can be integrated to achieve rapid and refined identification of defects in the bottom joints.
作者
张东波
江燕
冷予冰
ZHANG Dongbo;JIANG Yan;LENG Yubing(Shanghai Key Laboratory of Engineering Structure Safety,Shanghai Research Institute of Building Sciences Co.,Ltd.,Shanghai 200032,China)
出处
《工业建筑》
北大核心
2023年第9期128-137,共10页
Industrial Construction
基金
国家重点研发计划(2022YFF0609200)
上海市自然科学基金(22ZR1453700)。
关键词
底部接缝
施工缺陷
数值模拟
单面平测法
穿透式对测法
检测
bottom joint
construction defect
numerical simulation
single-plane testing method
penetration testing method
detection
