Sounding of subsurface concrete defects using frequency response of flexural vibration
Sounding of subsurface concrete defects using frequency response of flexural vibration
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DOI：
10.1016/j.cemconcomp.2018.06.006
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发表时间：
2018-09-01
影响因子：
10.5
通讯作者：
Gupta, Rishi
中科院分区：
文献类型：
--
作者：
Blaney, Sean;Gupta, Rishi
标准的探测程序，如锤击和链条拖曳，可用于确定地下混凝土缺陷的位置，但通常取决于受过培训的检查员的个人判断和听力。然而，仅靠耳朵很难测量缺陷深度信息。通过记录音频并分析锤击、单连杆和三连杆链条拖曳以及基于扬声器的新型激励过程中测深的频率成分，检测了混凝土试板中的模拟缺陷。基于扬声器的方法显示出了与链式拖拽方法类似数量的缺陷检测能力，尽管它的效率略低于锤子方法。说话人用来诱发振动的声信号的持续时间和类型是影响基于说话人的方法性能的重要因素。通过所有测试方法对缺陷的可检测性在很大程度上取决于缺陷深度与缺陷横向尺寸的比率；在该比率超过约0.35后，缺陷可检测性下降。
Standard sounding procedures such as hammer percussion and chain drag can be used to locate subsurface concrete defects, but are often subject to the individual judgement and ear of trained inspectors. However, defect depth information can be difficult to gauge by ear alone. By recording audio and analyzing the frequency content of sounding via hammer percussion, a single- and triple-link chain drag, and a novel speaker-based excitation procedure, simulated defects in concrete test slabs were detected. The speaker-based method shows the capacity to detect a similar number of defects as chain drag methods, though it is slightly less effective than the hammer method. The duration and type of the acoustic signal used by the speaker to induce vibration are important factors in performance of the speaker-based method. The detectability of a defect via all methods tested depended largely on the ratio of defect depth to defect lateral dimensions; defect detectability was shown to drop after this ratio exceeded about 0.35.