An improved method of hydrodynamic pressure calculation for circular hollow piers in deep water under earthquake

Hydrodynamic pressure for cylindrical hollow piers standing in reservoir under earthquake differs from those of offshore structures. Hydrodynamic pressure expressions caused by outer water and inner water are so complicated that their solutions are difficult to calculate. Modification and simplification are performed to improve their adaptabilities in the paper. Added mass and added damping extracted from the hydrodynamic pressure expressions are incorporated into standard forced vibration governing equation, the modified governing equation and the modified numerical calculation model for a whole deep water pier considering hydrodynamic pressure are obtained. Free surface wave and its resulting added damping are proved to be negligible, added mass caused by elastic vibration can be approximately substituted by one caused by rigid motion of pier, and the expressions of the latter are further substituted by simple expressions obtained by curve fitting. Comparison studies show that the simplified expressions are not only convenient but also accurate enough for practical application. Also application is presented and how added mass intensifies seismic response of pier is revealed.

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  • English

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  • Accession Number: 01499554
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 29 2013 4:36PM