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SLSE Damage Detection Technique for Foundation Strengthening Using Plates

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Abstract

This paper discusses the use of a vibration-based technique for damage detection in metal and composite plate wrappings for pier foundation repairs. The SLSE (Scanning Laser-Strain Energy) method relies on full-field laser modal scanning and strain energy computation to establish damage locations within composite wrappings. Strain energy distribution relies on segmental derivation of detected deflection shapes; hence, large numbers of spatial data points are required. By providing high spatial data density, laser scanner complement nicely with the damage detection technique. Using an aluminum plate and a composite plate, results from a baseline scan test is presented in this paper to demonstrate the show the high potential of this technique for detecting damage in plates commonly used for structural repairs.

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Abbreviations

P :

Loading intensity (FL−1)

N x and N y :

Per unit length normal loads in the X and Y directions (FL−1)

N xy :

Shear loading (FL−1)

D :

Flexural rigidity (FL)

h :

Plate thickness (L)

E :

Young’s modulus (FL−2)

ν :

Poisson’s ratio (–)

λ ij :

Dimensionless parameter of mode indices i and j (–)

γ :

Mass per unit area (ML−2)

a :

Significant plate dimension (L)

E 1 :

Fiber direction elastic modulus (FL−2)

E 2 :

Transverse modulus (FL−2)

G 12 :

In-plane shear modulus (FL−2)

ν 12 and ν 21 :

In-plane Poisson’s ratios applied on the fiber and the transverse faces (–)

ψ(x) :

Mode shape (–)

f ij :

Vibration frequency (T−1)

U :

Strain energy distribution (FL−2)

ΔU :

Strain energy difference (FL−2)

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Acknowledgments

The authors would like to acknowledge former colleagues, Mr. Samer Petro, Mr. Suhas Venkatappa and Dr. John Moody, for technical support throughout the scanning laser research. The financial support of the Constructed Facilities Center and Professor H.V.S. GangaRao at West Virginia University is also recognized.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, The University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC, 28223-0001, USA

    S. E. Chen & D. M. Boyajian

  2. The University of North Carolina at Charlotte, 9201 University City Boulevard, Charlotte, NC, 28223-0001, USA

    H. I. Inyang

Authors
  1. S. E. Chen
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  2. D. M. Boyajian
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  3. H. I. Inyang
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Correspondence to S. E. Chen.

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Chen, S.E., Boyajian, D.M. & Inyang, H.I. SLSE Damage Detection Technique for Foundation Strengthening Using Plates. Geotech Geol Eng 29, 237–248 (2011). https://doi.org/10.1007/s10706-010-9367-8

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  • DOI: https://doi.org/10.1007/s10706-010-9367-8

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