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Stochastic Response of Composite Post Insulators under Seismic Excitation

Authors :
Haibo Wang
Yongfeng Cheng
Zhicheng Lu
Ronghua Huan
Qiangfeng Lü
Zhenlin Liu
Source :
Buildings, Vol 14, Iss 6, p 1539 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

Composite post insulators are crucial facilities in substations and are prone to significant damage during seismic disasters. However, existing research lacks seismic motion models suitable for power facilities and rarely involves stochastic models. Furthermore, considering the non-stationary characteristics of seismic motion, predicting the response of nonlinear systems under non-stationary excitation becomes exceedingly challenging. In view of this, the stochastic response of composite post insulators under the non-stationary stochastic seismic excitation appropriate for power facilities has been studied. First, a stochastic ground motion model, conforming to the Code for Seismic Design of Electrical Insulators in China, is established, incorporating amplitude and frequency non-stationarity. Next, the nonlinear dynamic system, accounting for multi-section composite post insulators and the nonlinearity of flange connections, is established under stochastic ground motion conditions. Based on this stochastic nonlinear dynamic model, the dynamic behavior of the system was analyzed using the stochastic dynamics method (the wavelet-Galerkin method), and the influence of nonlinear stiffness on the system response was discussed. The stochastic seismic response analysis method proposed in this paper can serve as a valuable reference for the seismic design of pillar-type electrical equipment.

Details

Language :
English
ISSN :
20755309
Volume :
14
Issue :
6
Database :
Directory of Open Access Journals
Journal :
Buildings
Publication Type :
Academic Journal
Accession number :
edsdoj.240ed8a82a744eebb32db5de0e060e24
Document Type :
article
Full Text :
https://doi.org/10.3390/buildings14061539