Effects of sample size of ground motions on seismic fragility analysis of offshore jacket platforms using Genetic Algorithm

Abyani, Mohsen; Bahaari, Mohammad Reza; Zarrin, Mohamad; Nasseri, Mohsen

doi:10.1016/j.oceaneng.2019.106326

Cited by 34 publications

(5 citation statements)

References 29 publications

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“…Three earthquake time history records -Kobe (Japan, January 16, 1995), Northridge (USA, January 17, 1994) and Chi-Chi (Taiwan, September 20, 1999)were selected for IDA because of their comprehensive documentation and varied characteristics entailing a wide range of frequency [35][36][37]. Due to space constraints the acceleration time history of only Kobe earthquake is presented in figure 2 with detail parameters of all the earthquakes presented in table 3 [38].…”

Section: Selection Of the Earthquake Time Historymentioning

confidence: 99%

Seismic fragility assessment of embankment: A displacement-based approach using dynamic finite element model analysis

Ahmed,

Alel,

Kadir

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The assessment of seismic fragility of highway embankments is a key component of seismic risk modeling for traffic infrastructure. This study examines the seismic fragility of an embankment using advanced finite element dynamic analysis, contrasting findings with prior research to validate results. Based on established methodologies, an incremental dynamic analysis (IDA) was executed, with the Probabilistic Seismic Demand Analysis (PSDA) for the development of fragility curves. A comparative study was conducted between two modeling methods; one employing finite difference (FD) method and other employing finite element (FE)method. The analysis revealed that, selection of inputs like the nature of earthquake time history and number of records selected along with the analysis method influences the seismic fragility assessment of embankments. The choice between finite difference and finite element methods can yield differing results, with FD, being grid-based, can face challenges with complex geometries and boundary conditions, on the other hand, FE’s mesh-based approach offers flexibility in modeling intricate domains, handles complex boundary conditions more adeptly, and provides a more continuous representation of material behavior. A distinct dynamic stability test based on Newmark sliding block principles showed the embankment slope’s inherent resilience, with no permanent deformation, underscoring the requirement for further research.

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Section: Selection Of the Earthquake Time Historymentioning

confidence: 99%

Seismic fragility assessment of embankment: A displacement-based approach using dynamic finite element model analysis

Ahmed,

Alel,

Kadir

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…15 ground-motion records of 8 earthquakes provided by the United States Pacific Earthquake Engineering Research Center (PEER) were selected for IDA [58][59][60]. The epicentral distances (E d ) of them are in the range of 10.9km to 50.9km, the magnitudes (M w ) are in the range of 5.7 to 7.6 and the original PGA are in the range of 0.094g to 0.968g [61,62], as shown in Table 3.…”

Section: Determination Of the Ground-motion Recordsmentioning

confidence: 99%

Embankment seismic fragility assessment: A case study on Xi’an-Baoji expressway (China)

Che

Yin

Zhao³

et al. 2021

PLoS ONE

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Although embankment seismic damages are very complex, there has been little seismic fragility research yet. Researches on seismic fragility of bridges, dams and reinforced concrete (RC) structures have achieved fruitful results, which can provide references for embankment seismic fragility assessment. Meanwhile, the influencing degrees of retaining structures, such as retaining walls on the embankment seismic performances are still unclear. The K1025+470 embankment of the Xi’an-Baoji expressway was selected as the research object, and the finite difference models of the embankment fill-soil foundation system and embankment fill-soil foundation-retaining wall system were established. The ground-motion records for Incremental Dynamic Analysis (IDA) were selected and the dynamic response analysis were conducted. Probabilistic Seismic Demand Analysis (PSDA) was used to deal with the IDA results and the seismic fragility curves were generated. Based on the assessment results, the influences of the retaining wall on the embankment seismic fragility were further verified. The research results show that regardless of which seismic damage parameter is considered or the presence or absence of the retaining wall, larger PGAs always correspond to higher probabilities of each seismic damage grade. Seismic damages to the embankment fill-soil foundation-retaining wall system are always lower than those of the embankment fill-soil foundation system under the same PGA actions, thus, the retaining wall can decrease the embankment seismic fragility significantly.

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“…To address these issues, it is crucial to first determine the minimum number of seismic inputs that can characterize the SCI effect on building responses. Previous studies have provided recommendations [28][29][30][31][32]. For example, Cimellaro et al [29] examined the impact of different seismic record selection methods on the fragility function of multiple-degree-of-freedom inelastic structural systems using nonlinear dynamic analysis.…”

Section: Introductionmentioning

confidence: 99%

The site-city interaction effect on structural responses and its application to fragility analysis

Tian,

Liu,

Chen

et al. 2023

Preprint

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Seismic fragility analysis is a crucial tool for assessing the seismic performance of buildings. In areas with dense clusters of tall buildings, the significant site-city interaction (SCI) effect alters wave propagation mechanisms, influencing the seismic fragility of structures. However, utilizing the incremental dynamic analysis method directly to calculate the seismic fragility of buildings considering the SCI effect encounters two main challenges. Firstly, it is unclear how many seismic scenarios need to be analyzed to fully capture the distribution of the SCI effect on building responses. Secondly, reducing the computational workload arising from the SCI effect and incremental dynamic analysis is a pressing concern. To address these challenges, this study examines the Shanghai Central Business District as a case study and employs a nonlinear numerical coupling scheme to analyze the SCI effect on building responses under different seismic wave inputs. The study investigates the minimum number of selected input motions required to achieve different accuracy levels. According to the findings, a minimum of seven pairs of seismic wave inputs are suggested for the SCI effect analysis. Moreover, the analysis demonstrates that low-rise buildings exhibit significantly larger variations in SCI-induced response changes compared to tall buildings. Therefore, a seismic fragility analysis method considering the SCI effect is proposed for low-rise buildings. This method offers a substantial reduction in computational workload while accurately capturing the SCI effect on building responses.

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Effects of sample size of ground motions on seismic fragility analysis of offshore jacket platforms using Genetic Algorithm

Cited by 34 publications

References 29 publications

Seismic fragility assessment of embankment: A displacement-based approach using dynamic finite element model analysis

Seismic fragility assessment of embankment: A displacement-based approach using dynamic finite element model analysis

Embankment seismic fragility assessment: A case study on Xi’an-Baoji expressway (China)

The site-city interaction effect on structural responses and its application to fragility analysis

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