Geomechanics and Engineering

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Structural damage detection through longitudinal wave propagation using spectral finite element method

  • Kumar, K. Varun (Department of Civil Engineering, Amrita School of Engineering, Coimbatore, Amrita Vishwa Vidyapeetham, Amrita University) ;
  • Saravanan, T. Jothi (Advanced Seismic Testing and Research Laboratory, CSIR-Structural Engineering Research Centre) ;
  • Sreekala, R. (Advanced Seismic Testing and Research Laboratory, CSIR-Structural Engineering Research Centre) ;
  • Gopalakrishnan, N. (Advanced Seismic Testing and Research Laboratory, CSIR-Structural Engineering Research Centre) ;
  • Mini, K.M. (Department of Civil Engineering, Amrita School of Engineering, Coimbatore, Amrita Vishwa Vidyapeetham, Amrita University)
  • Received : 2016.05.24
  • Accepted : 2016.09.30
  • Published : 2017.01.25
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Abstract

This paper investigates the damage identification of the concrete pile element through axial wave propagation technique using computational and experimental studies. Now-a-days, concrete pile foundations are often common in all engineering structures and their safety is significant for preventing the failure. Damage detection and estimation in a sub-structure is challenging as the visual picture of the sub-structure and its condition is not well known and the state of the structure or foundation can be inferred only through its static and dynamic response. The concept of wave propagation involves dynamic impedance and whenever a wave encounters a changing impedance (due to loss of stiffness), a reflecting wave is generated with the total strain energy forked as reflected as well as refracted portions. Among many frequency domain methods, the Spectral Finite Element method (SFEM) has been found suitable for analysis of wave propagation in real engineering structures as the formulation is based on dynamic equilibrium under harmonic steady state excitation. The feasibility of the axial wave propagation technique is studied through numerical simulations using Elementary rod theory and higher order Love rod theory under SFEM and ABAQUS dynamic explicit analysis with experimental validation exercise. Towards simulating the damage scenario in a pile element, dis-continuity (impedance mismatch) is induced by varying its cross-sectional area along its length. Both experimental and computational investigations are performed under pulse-echo and pitch-catch configuration methods. Analytical and experimental results are in good agreement.

Keywords

References

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