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Finite element modeling and assessment of seismic response of electrical substations porcelain post insulators
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2021-07-21 , DOI: 10.1016/j.soildyn.2021.106895
Mohamed A. Moustafa 1 , Khalid M. Mosalam 2
Affiliation  

The study presented in this paper focused on developing accurate computational finite element (FE) model of electrical substations ceramic (porcelain) post insulators. The objective is to investigate the structural behavior and seismic response of these critical equipment through detailed numerical simulations that can replace or minimize experimental qualification tests and optimize future design of electrical equipment. Detailed three-dimensional solid FE modeling was used to capture the complex geometry of post insulators and the brittle nature of ceramics. Dedicated material characterization tests were utilized to define the porcelain nonlinear material model parameters. The developed model was verified using previously conducted experiments and used to perform linear and nonlinear static and dynamic analyses. A sensitivity parametric study was conducted first to calibrate the model and rank the sources of uncertainties in porcelain insulator modeling using the so-called tornado diagram analysis. The calibrated model was further utilized to carry out nonlinear time history analysis under earthquake excitation and capture the dynamic mode of failure, which is not always feasible to achieve using experimental tests. The study concluded with identification of which modeling parameters significantly affect the simulated structural behavior of post insulators, and compared the inelastic response at failure under static and dynamic loading.



中文翻译:

变电站瓷柱绝缘子地震响应的有限元建模与评估

本文中提出的研究侧重于开发变电站陶瓷(瓷)支柱绝缘子的精确计算有限元 (FE) 模型。目标是通过详细的数值模拟来研究这些关键设备的结构行为和地震响应,这些模拟可以取代或最大限度地减少实验资格测试,并优化电气设备的未来设计。详细的三维实体有限元建模用于捕捉支柱绝缘子的复杂几何形状和陶瓷的脆性。专门的材料特性测试被用来定义陶瓷非线性材料模型参数。开发的模型已使用先前进行的实验进行验证,并用于执行线性和非线性静态和动态分析。首先进行了灵敏度参数研究,以校准模型并使用所谓的龙卷风图分析对瓷绝缘子建模中的不确定性来源进行排序。校准后的模型进一步用于在地震激发下进行非线性时程分析并捕获破坏的动态模式,这在使用实验测试时并不总是可行的。研究最后确定了哪些建模参数会显着影响支柱绝缘子的模拟结构行为,并比较静态和动态载荷下失效时的非弹性响应。校准后的模型进一步用于在地震激发下进行非线性时程分析并捕获破坏的动态模式,这在使用实验测试时并不总是可行的。研究最后确定了哪些建模参数会显着影响支柱绝缘子的模拟结构行为,并比较静态和动态载荷下失效时的非弹性响应。校准后的模型进一步用于在地震激发下进行非线性时程分析并捕获破坏的动态模式,这在使用实验测试时并不总是可行的。研究最后确定了哪些建模参数会显着影响支柱绝缘子的模拟结构行为,并比较静态和动态载荷下失效时的非弹性响应。

更新日期:2021-07-22
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