Crack detection in offshore platform structure based on structural intensity approach

2017 ◽  
Vol 389 ◽  
pp. 236-249 ◽  
Author(s):  
Xiaojie Tian ◽  
Guijie Liu ◽  
Zhiming Gao ◽  
Pengfei Chen ◽  
Weilei Mu
Keyword(s):  
Crack Detection ◽  
Offshore Platform ◽  
Structural Intensity ◽  
Offshore Platform Structure

Fatigue Damage Mechanism Experiments of the K-Joint of Offshore Platform Model

2012 ◽  
Vol 248 ◽  
pp. 114-118
Author(s):  
Gui Jie Liu ◽  
Min Chen ◽  
Xin Wang ◽  
Ying Long Li ◽  
Jian Jun Zhang
Keyword(s):  
Fatigue Damage ◽  
Damage Evolution ◽  
Element Model ◽  
Damage Mechanism ◽  
Offshore Platform ◽  
Microscopic Mechanism ◽  
Weak Part ◽  
Theoretical Predictions ◽  
Offshore Platform Structure ◽  
Ocean Environment

Ocean environment loads such as wave, current and wind load shows random distribution. The coupling of different kinds of load can easily lead to the fatigue damage of offshore platform structure. The damage presented the multiaxial characteristics would be formed in different directions and planes. K-joint is the key but weak part of the platform structure. This paper associated macro ocean environment factors with material interior micro structure change to reveal the microscopic mechanism of fatigue damage evolution and fatigue damage evolution regularity. By building finite element model of the offshore platform K-joint and physical model, an experiment is done under the function of wave and current load and makes a good result. In this way, the relationship between them and fatigue life was established, and the result agreed with the theoretical predictions.

Vibration Control of Offshore Platform Structure with Friction Dampers

2014 ◽  
Vol 638-640 ◽  
pp. 318-321
Author(s):  
Da Hai Zhao ◽  
Jing Lin Zhang
Keyword(s):  
Energy Dissipation ◽  
Vibration Control ◽  
Equation Of Motion ◽  
Offshore Platform ◽  
Wave Loads ◽  
Friction Damper ◽  
Friction Dampers ◽  
Offshore Platform Structure ◽  
Better Than

The performance of friction dampers to mitigate waves and earthquakes in tower-type offshore platform is investigated in this paper. Taking the offshore platform of TOWER-1 as an example, the equation of motion of offshore platform structure under earthquake and wave loads was established. The response reductions of offshore platform structure by different peak earthquakes were analyzed. The results show that the responses of the tower-type offshore platform structure under wave and earthquake could be effectively reduced by friction damper, and the energy dissipation ability of the friction damper differs in the different floors. The friction dampers give good response reductions in different peak earthquakes, and the response reductions of displacement are better than those of acceleration.

The Research Development of the Mechanism of Fatigue Crack Initiation Based on Microstructure for Offshore Platform

2014 ◽  
Vol 1004-1005 ◽  
pp. 1325-1330
Author(s):  
Gui Jie Liu ◽  
Yu Qian Wang ◽  
Meng Meng Li
Keyword(s):  
Fatigue Crack ◽  
Marine Environment ◽  
Structural Damage ◽  
Physical Mechanism ◽  
Fatigue Crack Initiation ◽  
Fatigue Loading ◽  
Multiaxial Fatigue ◽  
Offshore Platform ◽  
Development Direction ◽  
Offshore Platform Structure

In the capricious marine environment, the offshore platform structure is exposed to the multiaxial fatigue loading in which damage would be formed in different directions and planes. Evolution of the structural damage physical mechanism caused by marine environment load is more complicated. Based on the analysis of a large number of literatures, this paper reviews the research status of the fatigue crack mechanism in China and abroad, and predicts the development direction in the future.

Full Dynamic Analysis of Offshore Platform Structures Using Exact Timoshenko Pipe Element

2003 ◽  
Vol 125 (3) ◽  
pp. 168-175 ◽  
Author(s):  
A. M. Horr ◽  
M. Safi
Keyword(s):  
Spectral Element Method ◽  
Spectral Element ◽  
Offshore Platform ◽  
Dynamic Loads ◽  
Tubular Structures ◽  
Timoshenko Theory ◽  
Offshore Structure ◽  
The Past ◽  
Offshore Platform Structure ◽  
Element Method

One of the major divisions in the mathematical modeling of a tubular structure is to include the effect of the transverse shear stress and rotary inertia in vibration of members. During the past three decades, problems of vibration of tubular structures have been considered by some authors, and special attention has been devoted to the Timoshenko theory. There have been considerable efforts, also, to apply the method of spectral analysis to vibration of a structure with tubular section beams. The purpose of this paper is to compare the results of the improved complex spectral element method for the Timoshenko theory with those derived from the conventional finite element method for an offshore structure. Using a computer program, the proposed formulation has been extended to derive the dynamic response of an offshore platform structure under dynamic loads.

Research on the Effect of Seasonal Environmental Loads on Bohai Bay Offshore Platform

2014 ◽  
Vol 1006-1007 ◽  
pp. 18-25
Author(s):  
Gui Jie Liu ◽  
Basit Farooq ◽  
Jian Bo Jiao ◽  
Li Hua Wang ◽  
Yu Zhang
Keyword(s):  
Fatigue Life ◽  
Axial Loading ◽  
Offshore Platform ◽  
Bohai Bay ◽  
Offshore Platforms ◽  
Element Analysis ◽  
Design Data ◽  
Environmental Loads ◽  
Structure Reliability ◽  
Offshore Platform Structure

In recent decades jacket platforms are widely used for facilitating the offshore oil industries in order to reach their demands of producing oils. In this regard given analyses shows the influence of seasonally based environmental loads acting on the offshore platform structure situated at Bohai Bay northeast of China. This paper studies and summarizes the structure reliability theory with jacket platform as the research object; it is the first time to aim and finds the most dangerous season effecting Bohai Bay offshore platforms by considering seasonal environmental loads. Finite element analysis ANSYS software is used for model analyses and optimisation of the structure spatial correlation seasonal loads. Environmental design data is extracted according to its geographical conditions in the form of wave, wind and current forces. Since most of the control management nodes work below the surface of the water so the distribution of stress and fatigue life of the pipe node under multi-axial loading is in different forms. The analysis mainly focuses on the stress and fatigue life appropriate characteristics to the actual situation of multi-axial loading case of the K-joint welding location and mainly environmental effect on the platform.

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