Cover Image

Fragility Analysis of Fixed Offshore Platform in Malaysia Under Earthquake Effect

In Malaysia, the oil and gas industry contribute significantly to its economy over the past decades. Currently there are over 250 offshore platforms in Malaysian waters. These platforms may be vulnerable to earthquake effects coming from near and far fields since seismic loading was not considered d...

Full description

Saved in:
Bibliographic Details
Main Authors: Azlan, F.S., Wahab, M.M.A., Ramli, M.Z., Rahman, A.A.
Format: Conference or Workshop Item
Published: Society of Petroleum Engineers 2023
Online Access:http://scholars.utp.edu.my/id/eprint/38005/
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85176813053&doi=10.2118%2f217087-MS&partnerID=40&md5=1289db02e49407170abf0778e2776ab8
Tags: Add Tag
No Tags, Be the first to tag this record!
id oai:scholars.utp.edu.my:38005
record_format eprints
spelling oai:scholars.utp.edu.my:380052023-12-11T03:09:02Z http://scholars.utp.edu.my/id/eprint/38005/ Fragility Analysis of Fixed Offshore Platform in Malaysia Under Earthquake Effect Azlan, F.S. Wahab, M.M.A. Ramli, M.Z. Rahman, A.A. In Malaysia, the oil and gas industry contribute significantly to its economy over the past decades. Currently there are over 250 offshore platforms in Malaysian waters. These platforms may be vulnerable to earthquake effects coming from near and far fields since seismic loading was not considered during the design stage for all offshore structures within all three (3) offshore sectors in Malaysia waters, including Sabah. Contrary to common belief that Malaysia is located outside the Pacific Ring of Fire of recent incidents and research is proving the opposite. In this study, seismic vulnerability assessment for fixed offshore platform in Sabah water is performed. Non-linear static (Pushover Analysis) and non-linear dynamic analysis (Incremental Dynamic Analysis or IDA) were performed prior to obtaining the fragility curve. Pushover analysis shows the seismic capacity through determining the drift ratio of the structure. The outcome of the analysis will then be classified into different damage levels according to Federal Emergency Management Agency (FEMA) categories; Operational Procedure (OP), Immediate Occupancy (IO), Damage Collapse (DC), Life Safety (LS) and Collapse Prevention (CP). Incremental dynamic analysis was performed by series of non-linear response histories which enabled PGA values to be systematically scaled. The maximum displacement and drift ratio were computed and compared with the drift ratio from pushover analysis to be classified into FEMA defined damage levels. Then, the mean and standard deviation of the PGA values were computed and substituted into fragility curve equation. The curve describes the probability of damage of the fixed offshore platform under earthquake effects. From the result, the vulnerability of the fixed offshore platform in Sabah water for an earthquake was concluded to be having a low probability of damage, i.e., 6.4 OP and 4.86 IO associated to Sabah PGA value of 0.28g. © 2023, Society of Petroleum Engineers. Society of Petroleum Engineers 2023 Conference or Workshop Item NonPeerReviewed Azlan, F.S. and Wahab, M.M.A. and Ramli, M.Z. and Rahman, A.A. (2023) Fragility Analysis of Fixed Offshore Platform in Malaysia Under Earthquake Effect. In: UNSPECIFIED. https://www.scopus.com/inward/record.uri?eid=2-s2.0-85176813053&doi=10.2118%2f217087-MS&partnerID=40&md5=1289db02e49407170abf0778e2776ab8 10.2118/217087-MS 10.2118/217087-MS 10.2118/217087-MS
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description In Malaysia, the oil and gas industry contribute significantly to its economy over the past decades. Currently there are over 250 offshore platforms in Malaysian waters. These platforms may be vulnerable to earthquake effects coming from near and far fields since seismic loading was not considered during the design stage for all offshore structures within all three (3) offshore sectors in Malaysia waters, including Sabah. Contrary to common belief that Malaysia is located outside the Pacific Ring of Fire of recent incidents and research is proving the opposite. In this study, seismic vulnerability assessment for fixed offshore platform in Sabah water is performed. Non-linear static (Pushover Analysis) and non-linear dynamic analysis (Incremental Dynamic Analysis or IDA) were performed prior to obtaining the fragility curve. Pushover analysis shows the seismic capacity through determining the drift ratio of the structure. The outcome of the analysis will then be classified into different damage levels according to Federal Emergency Management Agency (FEMA) categories; Operational Procedure (OP), Immediate Occupancy (IO), Damage Collapse (DC), Life Safety (LS) and Collapse Prevention (CP). Incremental dynamic analysis was performed by series of non-linear response histories which enabled PGA values to be systematically scaled. The maximum displacement and drift ratio were computed and compared with the drift ratio from pushover analysis to be classified into FEMA defined damage levels. Then, the mean and standard deviation of the PGA values were computed and substituted into fragility curve equation. The curve describes the probability of damage of the fixed offshore platform under earthquake effects. From the result, the vulnerability of the fixed offshore platform in Sabah water for an earthquake was concluded to be having a low probability of damage, i.e., 6.4 OP and 4.86 IO associated to Sabah PGA value of 0.28g. © 2023, Society of Petroleum Engineers.
format Conference or Workshop Item
author Azlan, F.S.
Wahab, M.M.A.
Ramli, M.Z.
Rahman, A.A.
spellingShingle Azlan, F.S.
Wahab, M.M.A.
Ramli, M.Z.
Rahman, A.A.
Fragility Analysis of Fixed Offshore Platform in Malaysia Under Earthquake Effect
author_facet Azlan, F.S.
Wahab, M.M.A.
Ramli, M.Z.
Rahman, A.A.
author_sort Azlan, F.S.
title Fragility Analysis of Fixed Offshore Platform in Malaysia Under Earthquake Effect
title_short Fragility Analysis of Fixed Offshore Platform in Malaysia Under Earthquake Effect
title_full Fragility Analysis of Fixed Offshore Platform in Malaysia Under Earthquake Effect
title_fullStr Fragility Analysis of Fixed Offshore Platform in Malaysia Under Earthquake Effect
title_full_unstemmed Fragility Analysis of Fixed Offshore Platform in Malaysia Under Earthquake Effect
title_sort fragility analysis of fixed offshore platform in malaysia under earthquake effect
publisher Society of Petroleum Engineers
publishDate 2023
url http://scholars.utp.edu.my/id/eprint/38005/
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85176813053&doi=10.2118%2f217087-MS&partnerID=40&md5=1289db02e49407170abf0778e2776ab8
_version_ 1787138254341931008
score 13.222552

Similar Items