High-Performance Materials in Composite Construction

Scope of the investigations was the fatigue behavior of different shear connectors like headed studs and the puzzle-strip, which is a continuous shear connector in high-strength concrete (HSC). For both types of shear connectors, cyclic push-out tests as well as large-scale beam tests under cyclic loading were carried out. The headed studs failed after a mean lifetime of 2,3 × 106 applying 40-50% of the static resistance as a maximum amplitude and R = 0,45. The residual strength after 1,0 × 106 load cycles was reduced by about 25% in comparison with the static push-out strength. The continuous shear connectors were tested with two different stress amplitudes (R = 0,54 and R = 0,42). None of the test specimens failed in the fatigue tests with up to 2,0 × 106 load cycles. Moreover, there was no reduction in residual strength in the tests with the smaller stress range (?P/Pu,0 = 0,2). One test with a stress range ?P/Pu,0 = 0,25 showed a recuction in residual strength of 24%. The cyclic beam tests with headed studs show that the prediction of the fatigue failure according to the current standards is not satisfactorily. A good prediction of the crack propagation (thus fatigue) can rather be accomplished by using an approach based on the crack-slip relationship. For the continuous puzzle strip, the fatigue behavior depends on the manufactoring process, the state of the cutting-induced heat treatment of the surface material and the surface roughness. For the tested connector geometry, a threshold value for the crack propagation was determined. (A)

  • Availability:
  • Authors:
    • HEGGER, J
    • FELDMANN, M
    • RAUSCHER, S
    • HECHLER, O
  • Publication Date: 2009

Language

  • English

Media Info

  • Pagination: 438-446
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01147207
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Dec 24 2009 8:52AM