Buckling Analysis of Offshore Jackets in Removal Operations

2011 ◽  
Author(s):  
Wenjing Xia ◽  
P. C. J. Hoogenboom
Keyword(s):  
Structural Analysis ◽  
Failure Mode ◽  
Current Practice ◽  
Buckling Analysis ◽  
Steel Frame ◽  
Frame Structures ◽  
Steel Frame Structures ◽  
Frame Member ◽  
Offshore Jackets

In analysis of the removal of offshore jackets an important failure mode is buckling. In current practice, a buckling check involves manual determination of the buckling lengths of each frame member. It is estimated that 5 to 10% of the man-hours in structural analysis of removal projects is spend on checking and correcting buckling lengths. Fortunately, an alternative method is available that does not require determining buckling lengths. In this paper it is shown how this method can be derived from the NORSOK standard for tubular steel frame structures. The method is demonstrated in a removal analysis of an offshore jacket. It is concluded that this method can be successfully applied.

scholarly journals Finite Particle Method-Based Collapse Simulation of Space Steel Frame Subjected to Earthquake Excitation

2018 ◽  
Vol 2018 ◽  
pp. 1-19
Author(s):  
Xiao-Hong Long ◽  
Rong Yue ◽  
Yong-Tao Ma ◽  
Jian Fan
Keyword(s):  
Nonlinear Problems ◽  
Particle Method ◽  
Steel Frame ◽  
Frame Structures ◽  
Response Analysis ◽  
Earthquake Excitation ◽  
Theoretical Derivation ◽  
Steel Frame Structures ◽  
Frame Member ◽  
Finite Particle

In the process of collapse failure of the space steel frame subjected to earthquake excitation, complex behaviors often are involved, including geometric nonlinearity, material nonlinearity, fracture, contact, and collisions. In view of the unique advantages of the finite particle method to analyze complex structural nonlinear problems, this paper utilized the finite particle method as the basic means of analysis and used MATLAB software for computational analysis. This paper first derived a finite particle method-based space steel frame model, conducted static analysis and dynamic response analysis under earthquake excitation, and compared findings with ANSYS analysis results to validate reliability. This paper established the fracture criterion and failure mode of a steel frame member. Theoretical derivation and numerical simulation indicate that the finite particle method is a feasible and effective way to simulate the collapse of space steel frame structures subjected to earthquake excitation. This method provides a new approach to study the collapse and anticollapse seismic design of space steel frame structures subjected to earthquake excitation.

Study on Seismic Designs Controlling Locations of Failure Inside Steel Frame Structures Under Severe Ground Motions

2019 ◽  
Author(s):  
Kensuke Shiomi
Keyword(s):  
Failure Mode ◽  
Seismic Performance ◽  
Power Plants ◽  
Ground Motions ◽  
Thermal Power ◽  
Design Procedure ◽  
Steel Frame ◽  
Shaking Table ◽  
Frame Structures ◽  
Steel Frame Structures

Abstract For steel frame infrastructure facilities like thermal power plants, storage facilities or port facilities, the more advanced seismic performance is needed which not only prevent major damages against assumed design ground motions but also result in the “desirable failure mode” that concerns the recovery works or prevent from resulting in catastrophic failure mode, even under severe ground motions beyond design assumptions in which occurrence of some damages in structures are inevitable. “Seismic structures which can control the locations of failure of structural members inside structures” is one of the examples of this seismic performance. By adding this performance to steel frame structures at the stage of seismic design, the high resilience structures which concern recovery works after earthquakes can be realized. In this research, a basic study on the seismic performance which controls the locations of fractures of steel frame members by adjusting the cross sections of each structural member was carried out. The analytical studies about the design procedure to realize this seismic performance were conducted. Then, by conducting the shaking table tests for simple steel frame structures and confirming the location of fractures under dynamic loads, the possibility of this seismic performance was discussed experimentally.

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