IES测试法在港工结构混凝土缺陷检测中的应用
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摘要
通过模型试验和工程应用,研究了IES测试法在港工结构混凝土缺陷检测中的应用技术。通过模型试验研究了该方法的参数设置、操作步骤以及缺陷尺寸、缺陷深度、墩柱状构件对应力响应的影响。得到如下结论:1)缺陷判断方法以主频偏差为主,频域曲线出现次峰为辅,阈值可定为5%。2)缺陷尺寸与主频偏差成正比关系,缺陷深度效应存在阈值,深度较浅对主频偏差影响较小,超过阈值则成正比关系。3)IES系统不适用于墩柱状构件,其有效检测深度应小于1 m。在此基础上将该方法应用于某高桩码头预制混凝土构件的检测中,通过检测厚度云图,直观快捷地识别出了混凝土内部缺陷。
Through model test and engineering application,the paper studied the application technology of IES test method in the detection of concrete defects existing in the port structure. It studied the influences of parameter setting,operation steps,defect size,defect depth,and columnar components in this method on the stress response through model test and got the following conclusions: 1) The defect judging method is mainly based on the deviation of main frequency and supplemented by that the frequency-domain curve appears secondary peak; the threshold value can be fixed as 5%.2) Defect size is positively correlated with the deviation of main frequency; defect depth has a threshold value; shallow depth produces small influence on the deviation of main frequency, and when the depth exceeds the threshold value,the defect depth is in direct proportion to the deviation of main frequency.3) As the effective detecting depth of IES system shall be less than 1 m,so it doesn't apply to the columnar member. On this basis,this method was applied in the detection of precast concrete unit at a high-pile wharf. The defect inside the concrete could be recognized intuitionally and quickly by detecting the thickness cloud picture.
Through model test and engineering application,the paper studied the application technology of IES test method in the detection of concrete defects existing in the port structure. It studied the influences of parameter setting,operation steps,defect size,defect depth,and columnar components in this method on the stress response through model test and got the following conclusions: 1) The defect judging method is mainly based on the deviation of main frequency and supplemented by that the frequency-domain curve appears secondary peak; the threshold value can be fixed as 5%.2) Defect size is positively correlated with the deviation of main frequency; defect depth has a threshold value; shallow depth produces small influence on the deviation of main frequency, and when the depth exceeds the threshold value,the defect depth is in direct proportion to the deviation of main frequency.3) As the effective detecting depth of IES system shall be less than 1 m,so it doesn't apply to the columnar member. On this basis,this method was applied in the detection of precast concrete unit at a high-pile wharf. The defect inside the concrete could be recognized intuitionally and quickly by detecting the thickness cloud picture.
引文
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[3]傅翔,罗骐先,宋人心,等.冲击回波法检测隧洞混凝土衬砌厚度[J].水力发电,2006,32(1):48-50.
[4]岳振民,李雅娟,成超,等.基于冲击回波理论的预应力管道压浆密实度无损检测研究[J].公路,2015(9):236-240.
[5]卢江波,方志.基于冲击回波厚度频率的预应力孔道注浆状态分析[J].地震工程与工程振动,2013,33(3):239-244.
[6]姚华.扫描式冲击回波法检测后张预应力管道内缺陷的模型试验研究[D].重庆:重庆交通大学,2008.
[7]万利军,单炜,张宏祥,等.冲击回波在孔道灌浆缺陷识别中的频谱效应试验研究[J].施工技术,2014,43(16):52-55.
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