摘要
采用有限元的计算方法分析、计算了网格宽度为5m和3m两种情况下建筑物在遭受直击雷和邻近雷击时,格栅型钢筋结构对脉冲磁场的屏蔽效果。计算结果表明,对于直接雷击,随着网格数的增多,支路电流值减小,支路附近的磁场值减少,磁场分布逐渐趋于均匀,安全区域明显增大。网格宽度为3m的危险区域离立柱的水平距离减少为0.5m,与5m网格相比减少了50%。
The shielding effect of impulse magnetic fields on the grid metal frame under direct lightning strike or nearby lightning strike were computed and analyzed by using finite element method (FEM) when the grid width were 5 meter and 3 meter respectively.As for the direct lightning strike,the results showed that with the increase of grid number,the value of branch current and magnetic field around decreased,the distribution of magnetic field became more and more uniform,and the safe area increased significantly...
出处
《现代建筑电气》
2010年第5期40-44,共5页
Modern Architecture Electric
关键词
脉冲磁场
屏蔽
有限元法
直击雷
邻近雷击
impulse magnetic fields
shield
finite element method（FEM）
direct lightning strike
nearby lightning stroke
