Directional wave effects on large offshore structures of arbitrary shape
department or school: Applied Science, Faculty of
department or school: Civil Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Sinha, Sanjay
issued: 2010-05-28T11:58:48Z
issued: 1985
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: A numerical method is described to study directional wave effects on large offshore structures of arbitrary shape, based on an extension of linear diffraction wave theory for regular waves. A computer program has been developed to compute loading transfer functions and response amplitude operators and hence the loading and response spectra for both long- and short-crested random waves. Cosine powered directional spreading functions which are independent of frequency have been used to account for the shortcrestedness of waves. Comparisions of the results for long- and short-crested seas show that there is a significant reduction in the loading, and hence in the response, due to shortcrestedness of waves. The probabilistic properties of the components of the loading and response are described. Since the sea surface is assumed to follow a Gaussian distribution, these are also random Gaussian variables. In short-crested waves, the loading and response components occur both in-line and transverse to the principal wave direction. Thus the maximum horizontal loading and response may occur in an arbitrary horizontal direction. An analytical method is developed to describe also the probabilistic properties of the maxima of the components and the maxima of their horizontal resultants. In the present study, results are described for a freely floating box. Comparisons are made with published results and are found to be quite favourable.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/25139
note: DIRECTIONAL WAVE EFFECTS ON LARGE OFFSHORE OF ARBITRARY SHAPE STRUCTURES by SANJAY SINHA B.Sc.(Engg), Ranchi U n i v e r s i t y , Ranchi, I n d i a , 1981 M.Tech., Indian I n s t i t u t e Of Technology, Madras, I n d i a , 1983 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in FACULTY OF GRADUATE STUDIES Department Of C i v i l E ngineering We accept t h i s t h e s i s as conforming to the r e q u i r e d standard THE UNIVERSITY OF BRITISH COLUMBIA MAY 1985 © SANJAY SINHA, 1985 In presenting t h i s thesis i n p a r t i a l f u l f i l m e n t of the requirements for an advanced degree at the University of B r i t i s h Columbia, I agree that the Library s h a l l make i t f r e e l y available for reference and study. I further agree that permission for extensive copying of t h i s thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. I t i s understood that copying or publication of t h i s thesis for f i n a n c i a l gain s h a l l not be allowed without my written permission. Department O f C i v i l Engineering The University of B r i t i s h Columbia 1956 Main Mall Vancouver, Canada V6T 1Y3 Date ^/xdjlr ^rr^L^. D E - 6 <"*/fm ABSTRACT A numerical method i s d e s c r i b e d to study d i r e c t i o n a l wave e f f e c t s on l a r g e o f f s h o r e s t r u c t u r e s of a r b i t r a r y shape, based on an e x t e n s i o n of l i n e a r d i f f r a c t i o n wave theory f o r r e g u l a r waves. A computer program has been developed to compute l o a d i n g t r a n s f e r f u n c t i o n s and response amplitude opera t o r s and hence the l o a d i n g and response s p e c t r a f o r both l o n g - and s h o r t - c r e s t e d random waves. Cosine powered d i r e c t i o n a l spreading f u n c t i o n s which are independent of frequency have been used to account f o r the sh o r t c r e s t e d n e s s of waves. Comparisions of the …
has type: Thesis/Dissertation
is shown at: 10.14288/1.0062942
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/25139