| Autor: |
Sang-Rai Cho, Jang-Hyun Jeong, Paul A. Frieze |
| Rok vydání: |
2010 |
| Předmět: |
|
| Zdroj: |
29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 2. |
| Popis: |
Protection structures for FPSO caissons are required to be strong enough not to contact caisson pipes even when the protection structure is damaged by impact by attendant vessels. In the present structural design process, non-linear commercial packages are employed for the collision analyses. However, non-linear collision analyses using commercial packages are still time-consuming and expensive to operate especially at the initial design stage. In this study, validation of the adopted commercial package was firstly performed using collision test results on unstiffened tubulars. Then, a rigorous parametric study was conducted on simple protection structures by changing the collision velocity and the scantling of the protection structure. A simple analytical expression was derived assuming that the kinetic energy of the striking vessel is dissipated by plastic elongation of tubulars and rotation of plastic hinges. Using the parametric study results, an equation for the modification factor was obtained by which the effects of local denting and dynamic behavior can be considered. The developed procedure was also substantiated using numerically predicted extent of damages of an actual protection structure.Copyright © 2010 by ASME |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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