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  

Frequency Domain Finite Element Analysis of Lightning Current and Magnetic Field Distribution Characteristics in Building Structure

作　　者：刘荣美[1] 汪友华[1] 张岩[1] 

机构地区：[1]河北工业大学河北省电磁场与电器可靠性省部共建重点实验室培育基地,天津300130

出　　处：《电工技术学报》2013年第S2期140-145,共6页Transactions of China Electrotechnical Society

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。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.

关 键 词：雷电防护系统(LPS) 雷电流 有限元 频域 电磁场 

分 类 号：TU895[建筑科学]