Detection of Ungrouted Ducts Using the Impact-Echo Method
碩士 === 國立中興大學 === 土木工程學系 === 84 === Prestressed box girders and I-shaped beams are commonly used in bridge construction. The objective of this research is to determine whether the impact-echo method is capable of detecting voids in grouted post-tensioning...
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| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
1996
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| Online Access: | http://ndltd.ncl.edu.tw/handle/06521423300481512242 |
| Summary: | 碩士 === 國立中興大學 === 土木工程學系 === 84 === Prestressed box girders and I-shaped beams are commonly used in
bridge construction. The objective of this research is to
determine whether the impact-echo method is capable of detecting
voids in grouted post-tensioning tendon ducts. Numerical studies
were performed first to understand how the stress waves produced
by point impact interact with completely or partially grouted
ducts. The feasibility of using the impact-echo method for
detection of voids in ducts can be evaluated. Laboratory studies
were carried out to verify the numerical results. Results
obtained from these studies show that there exists a big
difference between the spectra obtained from impact-echo tests
on completely grouted ducts and those for partially grouted
ducts. The location of the ducts containing voids can be
determined by identifying the corresponding high amplitude peak
in the spectrum.
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