Evaluation of Wear in Compliant Tower Pile Systems

1989 ◽  
Author(s):  
G.S. Johnson ◽  
A.E. Hasle ◽  
R.F. Figgers
Keyword(s):  
Compliant Tower

Fabrication of the Baldpate Compliant Tower

1999 ◽  
Author(s):  
James C. Edel ◽  
Stephen Thibodeaux ◽  
Fuat Sezer ◽  
Jack D. Payne ◽  
Charles H. Willis
Keyword(s):  
Compliant Tower

The Tensioned Riser Compliant Tower

1994 ◽  
Author(s):  
S.L. Smolinski ◽  
D.G. Morrison ◽  
D.A. Huete ◽  
P.W. Marshall
Keyword(s):  
Compliant Tower

Nonlinear Dynamic Response of a Compliant Tower Under the Effect of Steady and Unsteady Sea States

2017 ◽  
Author(s):  
Konstantinos Chatziioannou ◽  
Vanessa Katsardi ◽  
Apostolos Koukouselis ◽  
Euripidis Mistakidis
Keyword(s):  
Structural Analysis ◽  
Dynamic Response ◽  
Deep Water ◽  
Nonlinear Dynamic ◽  
Wave Theory ◽  
Random Wave ◽  
Wave Loading ◽  
Nonlinear Dynamic Response ◽  
Steady Wave ◽  
Compliant Tower

The purpose of this work is to highlight the importance of considering the actual nonlinear dynamic response for the analysis and design of fixed deep water platforms. The paper highlights the necessity of applying dynamic analysis through the comparison with the results obtained by the authors by applying static nonlinear analysis on the structure under examination. The example treated in the context of the present paper is a compliant tower, set-up in deep water. Nonlinearities are considered both for the calculation of the wave loadings and the structural analysis. The wave loading is based on linear random wave theory and comparisons are provided with the steady wave theories, Airy and Stokes 5th. The former solution is based on the most probable shape of a large linear wave on a given sea-state; the auto-correlation function of the underlying spectrum. On the other hand, in the field of structural analysis, two cases are considered for comparison, static analysis and time history dynamic analysis. For both types of analysis, two sub-cases are considered, a case in which geometric nonlinearity and nonlinearities related to the modelling of the soil are considered and a case in which the corresponding linear theories are employed (reference cases). The structural calculations were performed using the well-known structural analysis software SAP2000, which was enhanced by a special programming interface that was developed to calculate the wave loading and to directly apply the generated loads on the structural members. The results show that the consideration of the particle velocities associated with the linear random wave theory in the wave loading lead to significant differences with respect to the steady wave theories in terms of the displacements and stresses of the structure. Moreover, irrespectively of the adopted wave theory, the nonlinear analyses lead to significant discrepancies with respect to the linear ones. This is mainly associated with the nonlinear properties of the soil. Another source of discrepancies between the results of static and dynamic analyses stems from the change of the effective natural frequency of the structure when nonlinearities are considered.

VIBRATION OF A COMPLIANT TOWER IN THREE-DIMENSIONS

2002 ◽  
Vol 250 (4) ◽  
pp. 675-709 ◽  
Author(s):  
S.M. HAN ◽  
H. BENAROYA
Keyword(s):  
Three Dimensions ◽  
Compliant Tower

Quickwave: An Impulse Algorithm to Calculate Preliminary Design Shear and Moment Envelopes for Compliant Towers

1995 ◽  
Vol 117 (2) ◽  
pp. 85-90 ◽  
Author(s):  
D. G. Morrison
Keyword(s):  
Dynamic Response ◽  
Closed Form Solution ◽  
Form Solution ◽  
Steel Grade ◽  
Preliminary Design ◽  
Wave Load ◽  
Simple Method ◽  
Compliant Tower ◽  
Computer Analyses ◽  
Water Depths

A novel, simple method to calculate compliant tower (CT) level shear and moment envelopes for preliminary design has been developed, and verified by comparing with rigorous 3-D tower analyses. The approach relies on a vast experience base to define important features influencing the dynamic response of CTs, and a new closed-form solution for the acceleration (needed to construct design envelopes) of the tower caused by an impulsive-type wave load. The main benefits of the approach are: 1) the designer can iterate and quickly converge on a working preliminary design without resorting to time-consuming computer analyses; 2) the designer can quickly evaluate configurations for different water depths, pile arrangements, payload, steel grade, reserve buoyancy, and well counts.

Compliant Tower Response Prediction Procedures

1988 ◽  
Author(s):  
K.M. Steele ◽  
L.D. Finn ◽  
K.F. Lambrakos
Keyword(s):  
Response Prediction ◽  
Compliant Tower

Design and Installation of Catenary Risers for the Baldpate Compliant Tower

1999 ◽  
Author(s):  
James L. Babin ◽  
Joe G. Litzelfelner ◽  
Michael Ambrose ◽  
James C. Edel ◽  
Steve Will
Keyword(s):  
Compliant Tower
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