A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Seismic Reliability of Offshore Structures Based on Nonlinear Time History Analyses
Regarding the past earthquakes damages to offshore structures, as vital structures in the oil and gas industries, it is important that their seismic design is performed by very high reliability. Accepting the Nonlinear Time History Analyses (NLTHA) as the most reliable seismic analysis method, in this paper an offshore platform of jacket type with the height of 304 feet, having a deck of 96 feet by 94 feet, and weighing 290 million pounds has been studied. At first, some Push‐Over Analyses (POA) have been preformed to recognize the more critical members of the jacket, based on the range of their plastic deformations. Then NLTHA have been performed by using the 3‐components accelerograms of 100 earthquakes, covering a wide range of frequency content, and normalized to three Peak Ground Acceleration (PGA) levels of 0.3 g, 0.65 g, and 1.0 g. By using the results of NLTHA the damage and rupture probabilities of critical member have been studied to assess the reliability of the jacket structure. Regarding that different structural members of the jacket have different effects on the stability of the platform, an “importance factor” has been considered for each critical member based on its location and orientation in the structure, and then the reliability of the whole structure has been obtained by combining the reliability of the critical members, each having its specific importance factor.
The Seismic Reliability of Offshore Structures Based on Nonlinear Time History Analyses
Regarding the past earthquakes damages to offshore structures, as vital structures in the oil and gas industries, it is important that their seismic design is performed by very high reliability. Accepting the Nonlinear Time History Analyses (NLTHA) as the most reliable seismic analysis method, in this paper an offshore platform of jacket type with the height of 304 feet, having a deck of 96 feet by 94 feet, and weighing 290 million pounds has been studied. At first, some Push‐Over Analyses (POA) have been preformed to recognize the more critical members of the jacket, based on the range of their plastic deformations. Then NLTHA have been performed by using the 3‐components accelerograms of 100 earthquakes, covering a wide range of frequency content, and normalized to three Peak Ground Acceleration (PGA) levels of 0.3 g, 0.65 g, and 1.0 g. By using the results of NLTHA the damage and rupture probabilities of critical member have been studied to assess the reliability of the jacket structure. Regarding that different structural members of the jacket have different effects on the stability of the platform, an “importance factor” has been considered for each critical member based on its location and orientation in the structure, and then the reliability of the whole structure has been obtained by combining the reliability of the critical members, each having its specific importance factor.
The Seismic Reliability of Offshore Structures Based on Nonlinear Time History Analyses
Hosseini, Mahmood (author) / Karimiyani, Somayyeh (author) / Ghafooripour, Amin (author) / Jabbarzadeh, Mohammad Javad (author) / Santini, Adolfo (editor) / Moraci, Nicola (editor)
2008 SEISMIC ENGINEERING CONFERENCE: Commemorating the 1908 Messina and Reggio Calabria Earthquake ; 2008 ; Reggio Calabria (Italy)
AIP Conference Proceedings ; 1020 ; 963-970
2008-07-08
8 pages
Conference paper
Electronic Resource
English
The Seismic Reliability of Offshore Structures Based on Nonlinear Time History Analyses
| British Library Conference Proceedings | 2008
Seismic analysis of nonlinear offshore moored floating structures
| SAGE Publications | 2018
Strength-Based Seismic Reliability of a Compliant Offshore Tower
| SAGE Publications | 2011
Strength-Based Seismic Reliability of a Compliant Offshore Tower
| Online Contents | 2011
Evaluation of Seismic Stability of Claytor Dam Using Linear and Nonlinear Time History Analyses
| British Library Conference Proceedings | 2005