地闪密度对建筑物雷电防护的影响分析

Analysis on Influence of Ground Flash Density on Lightning Protection of Buildings

根据GB 50343-2012《建筑物电子信息系统防雷技术规范》局部修订稿提供的全国地闪密度对照表,以处于不同雷区典型省市的重要公共建筑物为例,分别对基底面积相同、高度不同的3类建筑物,按所在区域采用4种地闪密度计算对应的年预计雷击次数和防雷装置的雷电防护效率,分析地闪密度对建筑物防雷类别和电子信息系统雷电防护等级的影响;并对全国31个典型省市的影响规律进行分析,提出确定建筑物电子信息系统防护等级划分的建议。

According to the national ground flash density comparison table provided in the partial revision of the Technical Code for Protection of Building Electronic Information System against Lighting(GB 50343-2012),taking important public buildings in typical provinces and cities in different thunderstorm region as examples,the corresponding expected annual number of lightning flash and lightning protection efficiency of lightning protection devices are calculated by using 4 ground flash densities in the area for 3 types of buildings with the same base area and different heights,and the influence of ground flash density on lightning protection category of buildings and lightning protection level of electronic information system is analyzed.In addition,the influence laws of 31 typical provinces and cities in China are analyzed,and suggestions for determining the protection level of building electronic information systems are put forward.