The University of Southampton
University of Southampton Institutional Repository

Random vibration analysis of gravity platforms subjected to wind-generated waves and earthquakes

Random vibration analysis of gravity platforms subjected to wind-generated waves and earthquakes
Random vibration analysis of gravity platforms subjected to wind-generated waves and earthquakes
In this work a methodology is proposed to perform the dynamical analysis of a concrete gravity platform, e.g.p., subjected to wind generated waves and earthquakes. Particular emphasis is put on the prediction of the so-called long-term structural responses, i.e. the probable responses during and beyond the structure proposed lifetime. The uncertainties on the properties of the material of the structure, the ones related to the supporting soil, as well as the ones associated to the mentioned environmental loads, are taken into consideration in the proposed methodology.

An important feature of the methodology is that it allows to carry out parametrical studies aiming to determine not only the structural responses of interest but also to define in a statistical sense the relative influence of each of the parameters in those responses. An application of the proposed methodology is presented.

A parametrical study on the maximum responses of a concrete gravity platform located in the North Sea was carried out. The parameters included were: Youngs modulus and critical damping of the reinforced concrete, soil media idealization and soil shear modulus, wave and seismic excitation. A seismic risk analysis for the platform site was performed because of the lack of seismic information of the North Sea region. The responses considered here were the deck displacement, the base shear force and the overturning moment.

The study showed that the uncertainties about the mentioned excitations provide the largest contribution in the dispersion values of the responses. The mean values of the long-term responses were about 30 % higher than the short-term ones for the considered case. This shows the importance of their computation as an important step in the assessment of the dynamical behaviour of this type of structures.
University of Southampton
Chavez Gonzalez, Mario
b84eeda7-6af3-4bc2-be04-13d96dcdd52e
Chavez Gonzalez, Mario
b84eeda7-6af3-4bc2-be04-13d96dcdd52e
Brebbia, Carlos
f04fa5b1-e3c4-4a13-b863-c5f99e29afc4

Chavez Gonzalez, Mario (1979) Random vibration analysis of gravity platforms subjected to wind-generated waves and earthquakes. University of Southampton, Doctoral Thesis, 260pp.

Record type: Thesis (Doctoral)

Abstract

In this work a methodology is proposed to perform the dynamical analysis of a concrete gravity platform, e.g.p., subjected to wind generated waves and earthquakes. Particular emphasis is put on the prediction of the so-called long-term structural responses, i.e. the probable responses during and beyond the structure proposed lifetime. The uncertainties on the properties of the material of the structure, the ones related to the supporting soil, as well as the ones associated to the mentioned environmental loads, are taken into consideration in the proposed methodology.

An important feature of the methodology is that it allows to carry out parametrical studies aiming to determine not only the structural responses of interest but also to define in a statistical sense the relative influence of each of the parameters in those responses. An application of the proposed methodology is presented.

A parametrical study on the maximum responses of a concrete gravity platform located in the North Sea was carried out. The parameters included were: Youngs modulus and critical damping of the reinforced concrete, soil media idealization and soil shear modulus, wave and seismic excitation. A seismic risk analysis for the platform site was performed because of the lack of seismic information of the North Sea region. The responses considered here were the deck displacement, the base shear force and the overturning moment.

The study showed that the uncertainties about the mentioned excitations provide the largest contribution in the dispersion values of the responses. The mean values of the long-term responses were about 30 % higher than the short-term ones for the considered case. This shows the importance of their computation as an important step in the assessment of the dynamical behaviour of this type of structures.

Text
Chavez-Gonzalez - Version of Record
Available under License University of Southampton Thesis Licence.
Download (4kB)

More information

Published date: 1 September 1979

Identifiers

Local EPrints ID: 437398
URI: http://eprints.soton.ac.uk/id/eprint/437398
PURE UUID: 2bc90101-e140-446e-ae10-d051e865415a

Catalogue record

Date deposited: 29 Jan 2020 17:33
Last modified: 14 Sep 2021 20:55

Export record

Contributors

Author: Mario Chavez Gonzalez
Thesis advisor: Carlos Brebbia

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×