Investigation of the Parameters of Hertz Impact Model for the Pounding Analysis of Highway Bridge

Under the strong earthquake ground motions, the adjacent buildings with small distance and the highway bridges with expansion joints are sensitive to the pounding damage. Contact element approach was usually used to analyze the structure responses with pounding effect. The impact stiffness is the key parameter of the several existing contact models, such as the linear viscoelastic impact model and the nonlinear viscoelastic impact model. However, the linear spring model cannot account for the energy loss during impact, and the Kelvin model is untenable as it results in tensile forces acting just before separation. Alternatively, a non-linear spring based on the Hertz contact law can be used to model impact, but the impact stiffness in Hertz impact model is not easy to determine, when the impact surfaces between two segments are plain. In this study, the model of the Hertz-damper impact model is investigated. Firstly, the stiffness of the impact model is analyzed considering the surface roughness based on Hertz theory. Then, the structural responses of a highway bridge with pounding are analyzed using the proposed method for the Hertz impact model to validate the accuracy of the theory. Finally, the effect of the various pounding models on the structural response of the colliding structures is compared.

Language

  • English

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  • Accession Number: 01683992
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 3 2018 3:35PM