Srinivasan Chandrasekaran - Offshore Compliant Platforms

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A guide to the analysis and design of compliant offshore structures that highlights a new generation of platforms Offshore Compliant Platforms The book describes the preliminary design of triceratops in ultra-deep waters and presents a detailed analysis of environmental loads that are inherent in offshore locations such as wave, wind and current. The new methodology for the dynamic analysis of triceratops under ice loads, predominantly in ice-covered regions, is also examined with detailed parametric studies. In addition, the book covers the structural geometry and the various methods of analysis for assessing the performance of any other similar offshore platform under the special loads. A discussion of the fatigue analysis and service life prediction is also included. This important book:
• Includes the analysis and design of compliant offshore structures with a focus on a new generation of platforms
• Examines the preliminary design of triceratops in ultra-deep waters
• Covers an analysis of environmental loads that are inherent in offshore locations such as wave, wind and current
• Reviews the structural geometry and various methods of analysis for assessing the performance of any other similar offshore platform under special loads
• Discusses fatigue analysis and service life prediction 
Written for engineers and researchers across engineering including civil, mechanical, structural, offshore, ocean and naval architecture,
fills the need for a guide to new offshore platforms that provides an understanding of the behaviour of these structures under different loading conditions.

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2 Chapter 2Figure 2.1 Schematic diagram of the BLSRP installed in a wave flume.Figure 2.2 Experimental setup and arrangements: (a) side view; (b) hinged jo...Figure 2.3 Orientation of the BLSRP for the wave heading angle.Figure 2.4 Response of the BLSRP (0°, 0.1 m wave height).Figure 2.5 Numerical model of the BLSRP.Figure 2.6 Response of the BLSRP (30°, 15 m).Figure 2.7 Tether tension variations in mooring lines.Figure 2.8 Power spectral density plots of buoyant leg 1 (0°, 6 m, 10 second...Figure 2.9 Power spectral density plots of the deck (0°, 6 m, 10 seconds).Figure 2.10 Numerical model of the BLSRP (normal case).Figure 2.11 Numerical model of the BLSRP with postulated failure.Figure 2.12 Dynamic tether tension variation in postulated failure cases.Figure 2.13 Mathieu stability for the BLSRP in postulated failure cases.

3 Chapter 3Figure 3.1 Typical regular wave profile (H = 2 m, T = 5 s).Figure 3.2 PM spectrum for different sea conditions.Figure 3.3 Two‐dimensional random wave profile (Wang and Isberg 2015).Figure 3.4 API spectrum plot for different wind velocities.Figure 3.5 Wind‐generated current velocity profile.Figure 3.6 Service life estimation methodology.Figure 3.7 Triceratops model.Figure 3.8 Experimental model of a stiffened triceratops.Figure 3.9 Plan of the triceratops.Figure 3.10 RAOs of the deck and buoyant legs with regular waves.Figure 3.11 Deck response given different wave heading angles.Figure 3.12 Tether tension variation in rough sea conditions.Figure 3.13 Deck surge and heave PSD plots in very high sea conditions.Figure 3.14 Pitch response of the deck and buoyant legs in very high sea con...Figure 3.15 Maximum deck response in very high sea conditions.Figure 3.16 Tether tension spectrum with very high sea conditions.Figure 3.17 Maximum tether tension in very high sea conditions.Figure 3.18 Deck response with high sea conditions (w – waves, w + w – waves...Figure 3.19 Phase plots in the surge DOF with very high sea conditions.Figure 3.20 Buoyant leg response with high sea conditions.Figure 3.21 Tension spectrum with very high sea conditions.

4 Chapter 4Figure 4.1 Random ice force and vibration of the structure.Figure 4.2 True stress–strain curve of AH36 grade steel.Figure 4.3 Different shapes of indenters.Figure 4.4 Time–temperature curves for different fire conditions.Figure 4.5 Reduction factors for yield strength, proportional limits, and li...Figure 4.6 Variations in the thermal conductivity of carbon steel.Figure 4.7 Variations in the specific heat of carbon steel.Figure 4.8 Variations in the thermal strain of carbon steel.Figure 4.9 Spectral density plot given different ice velocities.Figure 4.10 Spectral density plot given different ice forces.Figure 4.11 Ice force–time history.Figure 4.12 PSD plots for normal ice sea conditions with ice load on two buo...Figure 4.13 PSD plots of tether tension variation in normal sea conditions....Figure 4.14 Total deck response for different ice thicknesses.Figure 4.15 Total deck response for different ice crushing strengths.Figure 4.16 Total deck response for different ice velocities.Figure 4.17 PSD plots of the deck in open water and ice‐covered load cases....Figure 4.18 Methodology of impact analysis.Figure 4.19 Numerical model of buoyant legs and indenters.Figure 4.20 Force versus nondimensional deformation curve.Figure 4.21 Deck surge responses for impact loads on buoyant leg 1.Figure 4.22 Force–deformation curves for different indenter sizes.Figure 4.23 Force–deformation curves for different impact locations.Figure 4.24 Force–deformation curves for different indenter shapes.Figure 4.25 Force–deformation curves for different numbers of stringers.Figure 4.26 Force–deformation curve of buoyant legs at different temperature...Figure 4.27 Deck plate of a triceratops.Figure 4.28 Scale deck plate model.Figure 4.29 Hydrocarbon fire cases.Figure 4.30 Temperature variations in plates and stiffeners.

5 Chapter 5Figure 5.1 Numerical model of a triceratops with a wind turbine.Figure 5.2 Pitch RAO of the triceratops.Figure 5.3 PSD plot of the surge free‐decay response.Figure 5.4 PSD plot of the roll free‐decay response.Figure 5.5 Frequency response to operable and parked conditions.Figure 5.6 PSD plots for different DOF.Figure 5.7 Dynamic tether tension variation.Figure 5.8 Plan and elevation of a stiffened buoyant leg.Figure 5.9 Fabricated model of a stiffened buoyant leg.Figure 5.10 Fabricated model of a ball joint.Figure 5.11 Surge, heave, and pitch RAOs of the deck and buoyant legs with 0...Figure 5.12 Surge, heave, and pitch RAOs of the deck and buoyant legs with 9...Figure 5.13 Surge, heave, and pitch RAOs of the deck and buoyant legs with 1...Figure 5.14 Effect of wave direction on the stiffened triceratops.Figure 5.15 Cross section of the buoyant legs.Figure 5.16 Plan view of the triceratops with circular and elliptical buoyan...Figure 5.17 Total force–time history, given high sea conditions.

Guide

1 Cover

2 Table of Contents

3 Begin Reading

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