Steel Jacket Structures for the New Ekofisk Complex in the North Sea.

Broughton, Peter; Aldridge, T; Komaromy, S

doi:10.1680/icien.1998.30433

Cited by 2 publications

(2 citation statements)

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“…For the design of structures against impacts, such as the design of offshore rigs subjected to ship collisions, very often an equivalent impact load is used. Some people have directly introduced an equivalent interface load in a dynamic analysis of the structure (Broughton et al [12]). In such an analysis the duration of the event would not be simulated correctly as it is determined only by the mass from the collided structure.…”

Section: Impact Durationmentioning

confidence: 99%

“…If this load can be evaluated, there might be no need for the involved and time consuming dynamic contact analysis and instead an equivalent impact load could be separately introduced to the two structures. The concept of equivalent impact load was also used in the design of offshore structures against ship collision (Sterndorff et al, [9]; Ellinas, [10] Waegter and Sterndorff, [11]; Broughton et al, [12]; API-2A-WSD, [13]; and DnV, [14]). This paper reports a system used, in a series of lateral impact tests on axially pre-compressed steel tubes, for the monitoring of the interface forces during the event.…”

Section: Introductionmentioning

confidence: 99%

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Interface Forces in Laterally Impacted Steel Tubes

2008

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In engineering mechanisms, solid bodies frequently come to a contact with a variety of geometric and kinematic situations. There has been a trend to express the interaction of the contacted bodies in the form of equivalent interface forces. The interface force represents the level of load transferred from one body to another. In a static or quasistatic contact problem, the interface forces could be sensibly evaluated by integrating the normal and the shear stresses over the common interfaces. In a dynamic contact, the interface stresses and subsequently the interface forces happen to be more complicated. They are, furthermore, affected by other parameters such as inertia forces, stress waves propagation, the material strain rate dependency and damping. This paper reports interface forces recorded in a series of experimental impact tests on axially pre-compressed steel tubes along with those from the numerical simulations of the tests. To monitor the so called impact loads, two small steel rings as load cells have been built in the striker. Based on the experimental and numerical results, the concept of equivalent interface forces in the impacted tubes has been verified. It has been highlighted that the interface forces (or the impact loads) may vary on the striker or the specimen themselves, depending on the measuring locations. Effects of axial compressions on the interface forces picked up by the striker load cells, impact loads imparted to the specimen supports and on the impact duration have been discussed. It has been reported that the initial compression applied to the tubes does not remain constant during and after the impact event. The amount of variations also depends on the initial level of the tube compression.

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Section: Impact Durationmentioning

confidence: 99%