Health assessment of beams - Theoretical formulation and analytical verification

P. H. Vo, Achintya Haldar

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Theoretical aspects and analytical verification of a novel non-destructive structural health assessment procedure being developed by a research team at the University of Arizona are presented in this paper. The experimental verification of the procedure is discussed in the companion paper. The health assessments of fixed ended and simply supported beams are specifically addressed. The basic procedure is a finite element-based linear time domain system identification technique where input excitation information is not required. Beams are represented by finite elements. By tracking the changes in the moduli of rigidities of the elements, the current health of the beams can be assessed. Rayleigh damping is used in the dynamic formulation to reduce the size of the identification problem. How to establish the optimal number of finite elements is first discussed. Defects, in terms of two notches, are introduced in an element in fixed ended and simply supported beams. Analytical responses of defect-free and defective beams excited by sinusoidal loadings are evaluated by using a computer programme. Using analytical response information only and completely ignoring the input excitation information, the health of the beams is successfully predicted in all cases. When defects were present, the method also identified the location of the defective element. The beams were then experimentally tested to verify conclusively the proposed method, as discussed in the companion paper.

Original languageEnglish (US)
Pages (from-to)33-44
Number of pages12
JournalStructure and Infrastructure Engineering
Volume4
Issue number1
DOIs
StatePublished - Feb 2008

Fingerprint

Health
defect
Defects
rigidity
damping
Computer program listings
Identification (control systems)
Damping
software
health
method
Modulus of rigidity

Keywords

  • Finite element
  • Health assessment
  • System identification
  • Time domain

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Safety, Risk, Reliability and Quality
  • Building and Construction
  • Mechanical Engineering
  • Ocean Engineering

Cite this

Health assessment of beams - Theoretical formulation and analytical verification. / Vo, P. H.; Haldar, Achintya.

In: Structure and Infrastructure Engineering, Vol. 4, No. 1, 02.2008, p. 33-44.

Research output: Contribution to journalArticle

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