Behavior of submerged, multiple bodies in earthquakes
Abstract
In order to investigate the nature of hydrodynamic interaction between two (or more) cylinders subjected to earthquake ground motion, a numerical analysis for determining the hydrodynamic forces on and the corresponding structural responses of a non-axisymmetrical offshore structure is presented. With the assumption of potential flow theory, a finite element method is developed to solve the boundary value problem in the fluid domain, which because of symmetry is reduced to one half. A localized finite element method utilizing eigenfunction expansions is also outlined in detail. If the cylinders have uniform cross sections, the three-dimensional problem can be reduced to a two-dimensional one and the computation becomes much more efficient. A computer program is developed to analyze the hydrodynamic forces and the structural responses according to the above mentioned analysis procedure, and illustrative examples are presented.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1982
- Bibcode:
- 1982STIN...8330816L
- Keywords:
-
- Earthquakes;
- Hydrodynamics;
- Submerged Bodies;
- Boundary Value Problems;
- Numerical Analysis;
- Offshore Platforms;
- Engineering (General)