Eventos Anais de eventos
CONEM 2022
XI Congresso Nacional de Engenharia Mecânica - CONEM 2022
FREE VIBRATION ANALYSIS OF A TENSION LEG PLATFORM TENDON
Submission Author:
José Pereira Ramos Junior , SP , Brazil
Co-Authors:
José Pereira Ramos Junior, Brendon Menezes de Abreu, Simone dos Santos Hoefel
Presenter: José Pereira Ramos Junior
doi://10.26678/ABCM.CONEM2022.CON22-0455
Abstract
The dynamic behavior in offshore structures is of great importance in the design, conception and operation phase, in order to predict failures, ensure stability, safety and avoid environmental and financial impacts. An offshore structure consists of a fixing or support plot that departs from the sea soil to the surface of the water and connects to superstructures such as wind turbines, oil and natural gas platforms. In this article, the free vibration of a clamped free uniform beam, similar to the Tension Leg Platform (TLP), is studied. Non-immersed and immersed beams in water are considered. The influence of the deck as an axial force applied at the free end is analyzed. Four beam models, Euler-Bernoulli, Rayleigh's, Shear, and Timoshenko are used to evaluate the natural frequencies using the Finite Element Method (FEM). In order to investigate the axial load influence, natural frequencies are calculated for several percentages of critical load. The same material parameters are considered in the numerical examples. Results show that the frequencies obtained by Euler-Bernoulli, the Rayleigh and the shear exceed those obtained by the Timoshenko theory. Reducing the tendon cross section, influence of water, and influence of the deck decrease the natural frequencies.
Keywords
Offshore, TLP platform, Beam theory, natural frequencies, Axial force
