Flexural wave impulse response evaluations of piles using multiple triaxial acceierometers

Helsin Wang, Chung Yue Wang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A flexural wave impulse response approach is particularly applicable in the nondestructive evaluation of foundations of overwater structures, such as bridge piers or wharves, that lack access to their tops. The experimental procedure of the flexural wave impulse response method is similar to that of the traditional (longitudinal wave) impulse response method. In order to pre-verify the possibility of integrity testing on a single newly constructed pile bent, the transient-state flexural waves are induced by lateral impact and recorded by three triaxial accelerometers equidistantly mounted to a model concrete pile side. The frequency-based analysis used in the conventional impulse response testing cannot cope with the flexural wave impulse response testing due to its dispersive characteristics at low frequencies. Using the resonance solutions and flexural mode guided wave prediction curve is a simple and efficient method of finding the resonant frequency and phase velocity when knowing pile diameter and flexural wave impulse response results. The vibration responses in the radial and axial direction are measured at the impact position (position 0°). The angular/tangential direction responses are also analyzed at position 90° away from the impact position. These phase velocities measured at resonant frequencies have good matches with the theoretical flexural mode wave predictions at frequencies below 4,000 Hz. The testing results also indicate that the resonance characteristics of flexural waves traveling in a pile are not dependent on measurement positions but the engineering properties and geometrical characterization in the concrete pile.

Original languageEnglish
Title of host publicationStress Wave Theory and Testing Methods for Deep Foundations
Subtitle of host publication10th International Conference
EditorsPaul Bullock, Gerald Verbeek, Samuel Paikowsky, David Tara
PublisherASTM International
Pages254-272
Number of pages19
ISBN (Electronic)9780803176676
DOIs
StatePublished - 2018
Event10th International Conference on Stress Wave Theory and Testing Methods for Deep Foundations - San Diego, United States
Duration: 27 Jun 201829 Jun 2018

Publication series

NameASTM Special Technical Publication
VolumeSTP 1611
ISSN (Print)0066-0558

Conference

Conference10th International Conference on Stress Wave Theory and Testing Methods for Deep Foundations
Country/TerritoryUnited States
CitySan Diego
Period27/06/1829/06/18

Keywords

  • Dispersion curve
  • Flexural wave impulse response method
  • Guided wave theory
  • Nondestructive testing
  • One-dimensional wave theory
  • Pile
  • Resonant frequency
  • Triaxial accelerometer

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