Abstract：Sleeve grouting connection is an important form of longitudinal steel bars connection in assembled concrete structures，and full sleeve grouting is the premise to ensure effective anchorage and effective stress transmission of steel bars. However，sleeve grouting is a concealed construction technology，and it is difficult to judge whether the grouting is full or not. In this paper，piezoelectric impedance technology is used to identify the sleeve grouting fullness，and the influence of grouting material fullness and piezoelectric chip layout position on the piezoelectric chip conductivity signal is studied. The conductivity signalfrequency relationship curve of piezoelectric chip along different position of sleeve height is obtained. According to the change of frequency spectrum curve of conductivity signal and the root mean square deviation (RMSD) of the curves，the filling degree of sleeve grouting can be judged. The results show that the conductive signals measured by the piezoelectric patches arranged at the upper part of the sleeve connection area are stable and reliable. The grouting plumpness inside the sleeve can be effectively identified by the changes of resonance frequency at the peak of the conductive signal spectrum curve and RMSD. At the same time，identification criteria and grading method of sleeve grouting plumpness based on piezoelectric impedance effect are proposed. The identification results of assembled concrete frame columns and shear walls agree well with the real conditions，which proves the effectiveness of the proposed mthod.
李俊华 何思聪 陈文龙 严蔚 孙彬. 基于压电阻抗效应的套筒灌浆饱满度识别与应用[J]. 土木工程学报, 2020, 53(5): 65-77, 117.
Li Junhua He Sicong Chen Wenlong Yan Wei Sun Bin. Identification and application of sleeve grouting #br#
plumpness based on piezoelectric impedance effect#br#. 土木工程学报, 2020, 53(5): 65-77, 117.
