Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Effect of Support Rotational Stiffness on Tension Estimation of Short Hanger Ropes in Suspension Bridges

현수교 짧은 행어로프의 장력추정시 지점부 회전강성의 영향

  • Lee, Jungwhee (Dept. of Civil and Environmental Eng., Dankook University) ;
  • Ro, Sang-Kon (Dept. of Civil Engineering, Pukyong National University) ;
  • Lee, Young-Dai (Dept. of Civil Engineering, Pukyong National University) ;
  • Kang, Byung-Chan (Dept. of Civil and Environmental Eng., Dankook University)
  • Received : 2013.06.28
  • Accepted : 2013.09.14
  • Published : 2013.10.20
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Abstract

Tension force of hanger ropes has been recognized and utilized as an important parameter for health monitoring of suspension bridges. Conventional vibration method based on string theory has been utilized to estimate tension forces of relatively long hanger ropes without any problem, however it is convinced that the vibration method is not applicable for shorter hanger ropes in which the influence of flexural stiffness is not ignorable. Therefore, as an alternative of vibration method, a number of feasibility studies of system identification(SI) technique considering flexural stiffness of the hanger ropes are recently performed. In this study, the influence of support condition of the finite element model utilized for the SI method is investigated with numerical examples. The numerical examples are prepared with the specification of the Kwang-Ahn bridge hanger ropes, and it is revealed that the estimation result of the tension force can be varied from -21.6 % to +35.3 % of the exact value according to the consideration of the support condition of FE model. Therefore, it is concluded that the rotational stiffness of the support spring should be included to the list of the identification parameters of the FE model to improve the result of tension estimation.

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References

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