摘要
本文介绍高层建筑钢筋结构体雷电暂态的计算模型,钢筋结构体的等值电路参数分别以电容和阻抗矩阵来表示。对于电容参数,采用平均电位法来确定;对于阻抗参数,采用Neumann公式来计算,大地集肤效应对阻抗参数的影响是通过引入复数深度加以考虑的。在求取钢筋结构体等值电路参数之后,对结构体中的分支导体进行分段,将每个相应的子导体系统等值地表示为耦合π型电路,通过求解由这些耦合π型电路所组成的等值网络,可以获得高层建筑钢筋结构体的雷电暂态响应。由本文给出的雷电暂态计算结果能够与试验结果较好地符合。
in this paper an efficient algorithm is presented for calculation of lightning transients in the steel mesh reinforcement of high buildings. The elctrical parameters of the finite length multiconductors are represented by capacitance and impedance matrices. The capacitance is evaluated by average potential method, while the impedance is determined by Neumann's integral formula. By application of a complex depth to the impedance calculation,the skin effect of the earth is taken into account. After having been obtained the electrical parameters,each branch of the steel structure under study is subdivided into a suitable number of elements to consider propagation phenomena and each subbranch system is replaced by a mutually coupled π circuit. Relevantly, the steel structure is simulated as an equivalent electrical network formed by capacitances and impedances reflecting the couplings between various constituent branches. Then, the lightning transient calculation can be performed to the equivalent network. A good agreement is shown between calculated and experimental results, which confirms the validity of the algorithm proposed in this paper.
出处
《中国电机工程学报》
EI
CSCD
北大核心
1996年第5期306-311,共6页
Proceedings of the CSEE
基金
北京自然科学基金
关键词
高层建筑
钢筋结构体
计算
lightning transient
steel mesh reinforcement tall buildings