Seismic performance and fragility analysis of power distribution concrete poles

2021 ◽  
Vol 150 ◽  
pp. 106909
Author(s):  
Amir Ghahremani Baghmisheh ◽  
Mojtaba Mahsuli
Keyword(s):  
Seismic Performance ◽  
Power Distribution ◽  
Fragility Analysis

scholarly journals A method of seismic performance evaluation based seismic fragility analysis

2018 ◽  
Vol 175 ◽  
pp. 04036 ◽  
Author(s):  
Feng Wang ◽  
Zhongzheng Guo
Keyword(s):  
Dynamic Analysis ◽  
Seismic Performance ◽  
Damage Index ◽  
Structural Models ◽  
Seismic Damage ◽  
Damage Parameter ◽  
Fragility Analysis ◽  
Seismic Fragility ◽  
Damage Level ◽  
Seismic Performance Evaluation

For evaluating seismic performance of structures, a method is presented based on increment dynamic analysis and seismic fragility analysis. Firstly, the failure probability equation is deduced, in which the relationships of seismic intensities and response demands can be determined by the increment dynamic analysis. On this basis the probabilities with different damage levels under different seismic intensities are obtained. Secondly, damage parameter R is defined and used to reflect seismic damage level of structures, damage index Re is defined and used to compare with R range and determine the situation of seismic damage. Finally, the procedure is proposed for evaluating structural seismic performance. In order to verify and demonstrate the method, three structural models are designed, and typical earthquake records are selected. The results of example analysis show that this method is convenient for evaluating multi-levels seismic performance of structures.

Seismic Performance Assessment of an Ultra-High–Voltage Power Transformer

2019 ◽  
Vol 35 (1) ◽  
pp. 423-445 ◽  
Author(s):  
Guo-Liang Ma ◽  
Qiang Xie ◽  
Andrew Whittaker
Keyword(s):  
Seismic Performance ◽  
High Voltage ◽  
Power Distribution ◽  
Distribution Systems ◽  
Power Transformer ◽  
Active Regions ◽  
Power Grids ◽  
Power Distribution Systems ◽  
Seismic Performance Assessment ◽  
Ultra High Voltage

Ultra-high–voltage (UHV) power distribution systems are seeing increased use in the seismically active regions of developing world, including China, as backbone power grids are being built out over long distances. This paper presents a study of the seismic performance of a UHV power transformer. Construction details for a typical Chinese UHV power transformer are described. The seismic behavior of the UHV power transformer is evaluated numerically, including calculation of modal properties and response to design basis earthquake shaking. The amplification of ground motion to the points of attachment of the seismically vulnerable transformer bushings is characterized. Alternative configurations for the sidewall-mounted turrets are investigated to mitigate the dynamic response of the 1,100-kV bushing.

scholarly journals Expected seismic performance of gravity dams using machine learning techniques

2021 ◽  
Vol 54 (2) ◽  
pp. 58-68
Author(s):  
Rocio Segura ◽  
Jamie Padgett ◽  
Patrick Paultre
Keyword(s):  
Seismic Performance ◽  
Seismic Analysis ◽  
Numerical Models ◽  
Limit State ◽  
Parameter Variation ◽  
Machine Learning Techniques ◽  
Fragility Analysis ◽  
Model Parameters ◽  
Fragility Functions ◽  
Limit States

Methods for the seismic analysis of dams have improved extensively in the last several decades. Advanced numerical models have become more feasible and constitute the basis of improved procedures for design and assessment. A probabilistic framework is required to manage the various sources of uncertainty that may impact system performance and fragility analysis is a promising approach for depicting conditional probabilities of limit state exceedance under such uncertainties. However, the effect of model parameter variation on the seismic fragility analysis of structures with complex numerical models, such as dams, is frequently overlooked due to the costly and time-consuming revaluation of the numerical model. To improve the seismic assessment of such structures by jointly reducing the computational burden, this study proposes the implementation of a polynomial response surface metamodel to emulate the response of the system. The latter will be computationally and visually validated and used to predict the continuous relative maximum base sliding of the dam in order to build fragility functions and show the effect of modelling parameter variation. The resulting fragility functions are used to assess the seismic performance of the dam and formulate recommendations with respect to the model parameters. To establish admissible ranges of the model parameters in line with the current guidelines for seismic safety, load cases corresponding to return periods for the dam classification are used to attain target performance limit states.

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