scholarly journals Seismic fragility analysis based on artificial ground motions and surrogate modeling of validated structural simulators

2021 ◽  
Author(s):  
Giuseppe Abbiati ◽  
Marco Broccardo ◽  
Imad Abdallah ◽  
Stefano Marelli ◽  
Fabrizio Paolacci
Keyword(s):  
Ground Motions ◽  
Surrogate Modeling ◽  
Fragility Analysis ◽  
Seismic Fragility

scholarly journals Seismic Fragility Analysis of Mid-Story Isolation Buildings

2021 ◽  
Keyword(s):  
Fragility Curves ◽  
Ground Motions ◽  
Near Field ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Plastic State ◽  
Far Field ◽  
Analysis Method ◽  
Isolation System ◽  
Isolation Layer

Abstract. Seismic fragility analysis is essential for seismic risk assessment of structures. This study focuses on the damage probability assessment of the mid-story isolation buildings with different locations of the isolation system. To this end, the performance-based fragility analysis method of the mid-story isolation system is proposed, adopting the maximum story drifts of structures above and below the isolation layer and displacement of the isolation layer as performance indicators. Then, the entire process of the mid-story isolation system, from the initial elastic state to the elastic-plastic state, then to the limit state, is simulated on the basis of the incremental dynamic analysis method. Seismic fragility curves are obtained for mid-story isolation buildings with different locations of the isolation layer, each with fragility curves for near-field and far-field ground motions, respectively. The results indicate that the seismic fragility probability subjected to the near-field ground motions is much greater than those subjected to the far-field ground motions. In addition, with the increase of the location of the isolation layer, the dominant components for the failure of mid-story isolated structures change from superstructure and isolation system to substructure and isolation system.

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

2019 ◽  
Vol 189 ◽  
pp. 106326 ◽  
Author(s):  
Mohsen Abyani ◽  
Mohammad Reza Bahaari ◽  
Mohammad Zarrin ◽  
Mohsen Nasseri
Keyword(s):  
Genetic Algorithm ◽  
Sample Size ◽  
Ground Motions ◽  
Fragility Analysis ◽  
Seismic Fragility

Seismic fragility analysis of strength eccentric structures subjected to pulse‐like ground motions

2019 ◽  
Vol 21 (5) ◽  
pp. 1959-1972
Author(s):  
Guobin Bu ◽  
Fangcheng Liu ◽  
Jia Bin ◽  
Zhe Zhang
Keyword(s):  
Ground Motions ◽  
Fragility Analysis ◽  
Seismic Fragility

scholarly journals Seismic Fragility Analysis based on Artificial Ground Motions and Surrogate Modeling of Validated Structural Simulators

2020 ◽  
Author(s):  
Giuseppe Abbiati ◽  
Marco Broccardo ◽  
Imad Abdallah ◽  
Stefano Marelli ◽  
Fabrizio Paolacci
Keyword(s):  
Earthquake Engineering ◽  
Large Scale ◽  
Hazard Analysis ◽  
Computational Cost ◽  
Surrogate Modeling ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Motion Modeling ◽  
Seismic Records ◽  
Performance Based Earthquake Engineering

This study introduces a computational framework for efficient and accurate seismic fragility analysis based on a combination of artificial ground motion modeling, polynomial-chaos-based global sensitivity analysis, and hierarchical kriging surrogate modeling. The framework follows the philosophy of the Performance-Based Earthquake Engineering PEER approach, where the fragility analysis is decoupled from hazard analysis. This study addresses three criticalities that are present in the current practice. Namely, reduced size of hazard-consistent size-specific ensembles of seismic records, validation of structural simulators against large-scale experiments, high computational cost for accurate fragility estimates. The effectiveness of the proposed framework is demonstrated for the Rio Torto Bridge, recently tested using hybrid simulation within the RETRO project.

Seismic fragility analysis of a CANDU type NPP containment building for near-fault ground motions

2006 ◽  
Vol 10 (2) ◽  
pp. 105-112 ◽  
Author(s):  
In-Kil Choi ◽  
Young-Sun Choun ◽  
Seong-Moon Ahn ◽  
Jeong-Moon Seo
Keyword(s):  
Ground Motions ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Near Fault

Seismic fragility analysis of nuclear power plant structure under far-field ground motions

2020 ◽  
Vol 219 ◽  
pp. 110890
Author(s):  
Chunfeng Zhao ◽  
Na Yu ◽  
Yagiz Oz ◽  
Jingfeng Wang ◽  
Y.L. Mo
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Ground Motions ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Far Field ◽  
Plant Structure

scholarly journals Seismic Fragility Analysis of Steel Liquid Storage Tanks Using Earthquake Ground Motions Recorded in Korea

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Sangmok Lee ◽  
Byungmin Kim ◽  
Young-Joo Lee
Keyword(s):  
Ground Motions ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Elastic Buckling ◽  
Fe Model ◽  
Storage Tanks ◽  
Limit States ◽  
Liquid Storage ◽  
Real Earthquake ◽  
Earthquake Damages

Liquid-containing storage tanks are important structures in industrial complexes. Because earthquake damages to liquid storage tanks can cause structural collapse, fires, and hazardous material leaks, there have been continuous efforts to mitigate earthquake damages using seismic fragility analysis. In this regard, this study focuses on the seismic responses and fragility of liquid storage tanks. First, the characteristics of earthquake ground motions are a critical factor influencing the seismic fragility of structures; thus, this study employs real earthquake records observed in the target area, southeastern Korea, with the earthquake characteristics estimated based on the ratio of peak ground acceleration to peak ground velocity. When a liquid storage tank oscillates during an earthquake, additional forces can impact the tank wall owing to hydrodynamic pressures. Therefore, this study presents a sophisticated finite element (FE) model that reflects the hydrodynamic effect of an oscillating liquid. Another advantage of such an FE model is that detailed structural responses of the entire wall shells can be estimated; this is not possible in simplified lumped mass or surrogate models. Lastly, probabilistic seismic demand models are derived for three critical limit states: elastic buckling, elephant’s foot buckling, and steel yielding. Using the real earthquake ground motion records, constructed FE model, and limit states, a seismic fragility analysis is performed for a typical anchored steel liquid storage tank in Korea. In addition, for comparison purposes, a ring-stiffened model is investigated to derive a seismic fragility curve. The results of the seismic fragility assessment show that elastic buckling is the most vulnerable damage state. In contrast, elephant’s foot buckling and steel yielding indicate relatively severe damage levels. Furthermore, it is observed that ring stiffeners decrease the elastic buckling damage, although there is no practical effect on elephant’s foot buckling and steel yielding in all ground motion intensities.

Numerical Surrogate Model of a Coupled Tank-Piping System for Seismic Fragility Analysis With Synthetic Ground Motions

2019 ◽  
Author(s):  
Rocco di Filippo ◽  
Giuseppe Abbiati ◽  
Osman Sayginer ◽  
Patrick Covi ◽  
Oreste S. Bursi ◽  
...  
Keyword(s):  
Finite Element ◽  
Ground Motion ◽  
Ground Motions ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Piping System ◽  
Motion Model ◽  
Meta Model ◽  
Ground Motion Model ◽  
Hybrid Simulations

Abstract Seismic risk evaluation of coupled systems of industrial plants often needs the implementation of complex finite element models to consider their multicomponent nature. These models typically rely on significant computational resources. Moreover, the relationships between seismic action, system response and relevant damage levels are often characterized by a high level of nonlinearity, thus requiring a solid background of experimental data. Furthermore, fragility analyses depend on the adoption of a significant number of seismic waveforms generally not available when the analysis is site-specific. To propose a methodology able to manage these issues, we present a possible approach for a seismic reliability analysis of a coupled tank-piping system. The novelty of this approach lies in the adoption of artificial accelerograms, FE models and experimental hybrid simulations to evaluate a surrogate meta-model of our system. First, to obtain the necessary input for a stochastic ground motion model able to generate synthetic ground motions, a disaggregation analysis of the seismic hazard is performed. Hereafter, we reduce the space of parameters of the stochastic ground motion model by means of a global sensitivity analysis upon the seismic response of our system. Hence, we generate a large set of synthetic ground motions and select, among them, a few signals for experimental hybrid simulations. In detail, the hybrid simulator is composed by a numerical substructure to predict the sliding response of a steel tank, and a physical substructure made of a realistic piping network. Furthermore, we use these experimental results to calibrate a refined ANSYS FEM. More precisely, we focus on tensile hoop strains in elbow pipes as a leading cause for leakage, monitoring them with strain gauges. Thus, we present the procedure to evaluate a numerical Kriging meta-model of the coupled system based on both experimental and finite element model results. This model will be adopted in a future development to carry out a seismic fragility analysis.

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