Fatigue in Aluminum Highway Bridges under Random Loading

Søren Rom, Henning Agerskov

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Abstract

Fatigue damage accumulation in aluminum highway bridges under random loading is studied. The fatigue life of welded joints has been determined both experimentally and from a fracture mechanics analysis. In the experimental part of the investigation, fatigue test series on welded plate test specimens have been carried through. The material that has been used has a 0.2% proof strength of 310 MPa and an ultimate tensile strength of 327 Mpa. The fatigue tests have been carried out using load histories, which correspond to one week’s traffic loading, determined by means of strain gauge measurements on the deck structure of the Farø Bridges in Denmark. The test series carried through show a significant difference between constant amplitude and variable
amplitude fatigue test results. Both the fracture mechanics analysis and the fatigue test results indicate that Miner’s rule, which is normally used in the design against fatigue in aluminum bridges, may give results which are unconservative. The validity of the results obtained from Miner’s rule will depend on the distribution of the load history in tension and compression.
Original languageEnglish
JournalInternational Journal of Applied Science and Technology
Volume4
Issue number6
Pages (from-to)95-107
ISSN2221-0997
Publication statusPublished - 2014

Keywords

  • Aluminum
  • Bridges
  • Highway bridges
  • Fatigue
  • Fatigue tests
  • Random processes

Cite this

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title = "Fatigue in Aluminum Highway Bridges under Random Loading",
abstract = "Fatigue damage accumulation in aluminum highway bridges under random loading is studied. The fatigue life of welded joints has been determined both experimentally and from a fracture mechanics analysis. In the experimental part of the investigation, fatigue test series on welded plate test specimens have been carried through. The material that has been used has a 0.2{\%} proof strength of 310 MPa and an ultimate tensile strength of 327 Mpa. The fatigue tests have been carried out using load histories, which correspond to one week’s traffic loading, determined by means of strain gauge measurements on the deck structure of the Far{\o} Bridges in Denmark. The test series carried through show a significant difference between constant amplitude and variableamplitude fatigue test results. Both the fracture mechanics analysis and the fatigue test results indicate that Miner’s rule, which is normally used in the design against fatigue in aluminum bridges, may give results which are unconservative. The validity of the results obtained from Miner’s rule will depend on the distribution of the load history in tension and compression.",
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Fatigue in Aluminum Highway Bridges under Random Loading. / Rom, Søren; Agerskov, Henning.

In: International Journal of Applied Science and Technology, Vol. 4, No. 6, 2014, p. 95-107.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Fatigue in Aluminum Highway Bridges under Random Loading

AU - Rom, Søren

AU - Agerskov, Henning

PY - 2014

Y1 - 2014

N2 - Fatigue damage accumulation in aluminum highway bridges under random loading is studied. The fatigue life of welded joints has been determined both experimentally and from a fracture mechanics analysis. In the experimental part of the investigation, fatigue test series on welded plate test specimens have been carried through. The material that has been used has a 0.2% proof strength of 310 MPa and an ultimate tensile strength of 327 Mpa. The fatigue tests have been carried out using load histories, which correspond to one week’s traffic loading, determined by means of strain gauge measurements on the deck structure of the Farø Bridges in Denmark. The test series carried through show a significant difference between constant amplitude and variableamplitude fatigue test results. Both the fracture mechanics analysis and the fatigue test results indicate that Miner’s rule, which is normally used in the design against fatigue in aluminum bridges, may give results which are unconservative. The validity of the results obtained from Miner’s rule will depend on the distribution of the load history in tension and compression.

AB - Fatigue damage accumulation in aluminum highway bridges under random loading is studied. The fatigue life of welded joints has been determined both experimentally and from a fracture mechanics analysis. In the experimental part of the investigation, fatigue test series on welded plate test specimens have been carried through. The material that has been used has a 0.2% proof strength of 310 MPa and an ultimate tensile strength of 327 Mpa. The fatigue tests have been carried out using load histories, which correspond to one week’s traffic loading, determined by means of strain gauge measurements on the deck structure of the Farø Bridges in Denmark. The test series carried through show a significant difference between constant amplitude and variableamplitude fatigue test results. Both the fracture mechanics analysis and the fatigue test results indicate that Miner’s rule, which is normally used in the design against fatigue in aluminum bridges, may give results which are unconservative. The validity of the results obtained from Miner’s rule will depend on the distribution of the load history in tension and compression.

KW - Aluminum

KW - Bridges

KW - Highway bridges

KW - Fatigue

KW - Fatigue tests

KW - Random processes

M3 - Journal article

VL - 4

SP - 95

EP - 107

JO - International Journal of Applied Science and Technology

JF - International Journal of Applied Science and Technology

SN - 2221-0997

IS - 6

ER -