EXPERIMENTAL AND NUMERICAL STUDY OF DAMAGED CANTILEVER

The introduction of a crack in a steel structure will cause a local change in the stiffness and damping capacity. The change in stiffness will lead to a change of some of the natural frequencies of the structure and a discontinuity in the associated mode shapes. This paper contains a presentation of the results from experimental and numerical tests with hollow section cantilevers containing fatigue cracks. Two different finite-element (FE) models have been used to estimate the modal parameters numerically. The first FE model consists of beam elements. The second FE model consists of traditional rectangular shell elements and one rectangular shell element with a transverse, internal, open crack. The analytical results from the numerical models are compared with data obtained from experimental tests. The numerical models give good agreements with the experimental data. The beam model takes into account only the first mode of the crack evaluation. In the shell model, all three modes of the crack growth are taken into account. Nevertheless, the results obtained for both models are satisfactory, because the beam is subjected to bending. It can be concluded that it is sufficient to use crack models for calculating natural frequencies in bending, taking into account the first mode of the crack extension only.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339399
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Rytter, A
  • Krawczuk, M
  • Kirkegaard, P H
• Publication Date: 2000-1

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 60-65
• Serial:
  • Journal of Engineering Mechanics
  • Volume: 126
  • Issue Number: 1
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9399
  • EISSN: 1943-7889
  • Serial URL: http://ascelibrary.org/journal/jenmdt

Subject/Index Terms

• TRT Terms: Accelerometers; Beams; Bending; Cantilevers; Cracking; Damping capacity; Experiments; Fatigue (Mechanics); Finite element method; Mathematical analysis; Mathematical models; Natural frequency; Shells (Structural forms); Steel structures; Stiffness
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00781822
• Record Type: Publication
• Contract Numbers: 59895410, CMS 9402196, CMS 95-03779
• Files: TRIS
• Created Date: Jan 27 2000 12:00AM