Effects of Redundancy in Bracing Systems on the Fragility Curve Development of Steel Jacket Offshore Platform
Steel jacket offshore platforms are typically employed for use in shallow to moderate water depths. During platform operations, there have been some historical accidents completely damaging the diagonal members of the bracing systems due to explosions, fire accidents and dropped objects. Differen...
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| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://repository.li.mahidol.ac.th/handle/123456789/47931 |
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| Institution: | Mahidol University |
| Language: | English |
| Summary: | Steel jacket offshore platforms are typically employed for use in shallow to
moderate water depths. During platform operations, there have been some historical
accidents completely damaging the diagonal members of the bracing systems due to
explosions, fire accidents and dropped objects. Different locations of damaged bracings
demonstrate different levels of risk for safety and integrity of the structures. This research
illustrates the effects of redundancy in the bracing systems for steel jacket offshore
platforms. Assessments have been carried out using the nonlinear pushover analysis
method and formations of nonlinear hinges of different members were noted.
Redundancy in different positions has been considered to investigate the consequences.
Reserve strength ratio (RSR) and damage strength ratio (DSR) of the global structure were
also evaluated to understand the importance of different local members. From the collapse
data of local failures, fragility curves for the global structures were estimated. The results
demonstrated that the position of damage can be a great concern which affects the overall
performance of the structures. |
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