Abstract: Nonlinear amplification of velocity signals in lowstrain integrity tests is typically done in order to enhance weak echoes and to superimpose any peak reflections. However, unraveling hidden information within signals obscured by noise may sometimes fail when using the conventional method. Therefore, a pile defect identification system is presented in this study based on nonlinear amplification and wavelet packet transform (WPT). After the conventional nonlinear amplification method is applied, the signals are decomposed by WPT in which the detection of the feature parameters from the presence of any geometric or material defects may easily be identified. To serve as a guide in the interpretation of the various characteristics of peak wave forms that are associated with defects, diagnostic rules are presented in this study. In addition, a parametric study was performed using the finite element method and results have shown that the identification method based on WPT can be a useful too

• Publication Date: 29-Apr-2018
• DOI: 10.15224/978-1-63248-150-4-29
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Abstract: The influence of number of CFRP sheet layers on bond strength between CFRP sheet and concrete was investigated by conducting double shear type pullout test. A total of eighteen concrete prisms were examined with different number of CFRP layer and maximum aggregate size. One, two and three layers of CFRP sheet were used. The experimental results indicate that the number of layers affect the bond strength. When the number of layer increases the bond strength increases beyond a certain value. Therefore, the number of layer is another factor that causes the CFRP sheets not to be fully utilized.

• Publication Date: 29-Apr-2018
• DOI: 10.15224/978-1-63248-150-4-30
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