建筑结构中雷电流和磁场分布特性的频域有限元方法分析

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摘要给出了建筑物复杂钢筋结构体的简化模型,考虑雷电暂态现象产生的电场和磁场的相互耦合,采用基于有限元的频域求解方法,得到了建筑物复杂钢筋结构体中的电流和磁场分布情况,与已有电路方法和试验结果进行比较,验证了提出的频域有限元方法的正确性。给出了四种参数变化情况下,简化模型8根立柱导体中的电流分布百分比及模型上层坐标为（0.05,0.05,1.5）的磁场值的相应变化。结果表明钢筋导体的电导率和直径对电流分布和磁场的影响很小,雷电流的频率对电流分布和磁场影响略大,雷电流的峰值对电流分布无影响而与磁场成正比例变化。这些仿真结果为建筑物的防雷设计提供了依据。

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	刘荣美
	汪友华
	张岩

关键词 ：雷电防护系统（LPS）, 雷电流, 有限元, 频域, 电磁场

Abstract：This paper presents a simplified model of complex steel structure of building, considering the bi-directionally coupled of electric and magnetic field that the lightning transient phenomenon produced. Adopted the frequency domain method based on the finite element, the current distribution and magnetic field was obtained in the complex steel structure. Compared with the existing circuit method and the test results, the validity of the proposed frequency domain finite element method was verified. In the case of four parameters variation, the current distribution and the magnetic field values of the simplified model varies correspondently. The results show that the diameter and conductivity of the conductor minor affect the current distribution and the magnetic field, the frequency of the lightning current affect the current distribution and magnetic field somewhat higher, the lightning current peak value has no effect on the current distribution but it is proportional to the magnetic field. These simulation results give guidelines for designing an LPS.

Key words： Lightning protection system(LPS) lightning current finite element method frequency domain electromagnetic field

收稿日期: 2013-10-11 出版日期: 2014-05-22

PACS:

TM865

引用本文:

刘荣美, 汪友华, 张岩. 建筑结构中雷电流和磁场分布特性的频域有限元方法分析[J]. 电工技术学报, 2013, 28(2增): 140-145. Liu Rongmei, Wang Youhua, Zhang Yan. Frequency Domain Finite Element Analysis of Lightning Current and Magnetic Field Distribution Characteristics in Building Structure. Transactions of China Electrotechnical Society, 2013, 28(2增): 140-145.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2013/V28/I2增/140

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作者简介:刘荣美女, 1980年生, 博士研究生, 研究方向为工程电磁场的数值计算及仿真。汪友华男, 1964年生, 博士, 教授、博士生导师, 研究方向为工程电磁场综合效应、电磁冶金技术及全局优化设计等。