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雷击建筑物年危险事件次数(ND)主要用于建筑物防雷级别的划分和雷击风险评估。为了更精细化计算ND,通过理论分析,借助Auot CAD采用几何法模拟计算,分别对两栋相临建筑物周边可能存在的三种环境状况进行了计算比对,并针对ND提出了优化计算式。通过分析计算得知:规范中的公式和本文中提出的计算式求得的结果差异显著,采用本文中提出的计算式对ND进行计算,其结果的合理性明显优于规范中的公式,且会对评估的结果产生直接的影响。同时,分析结果显示:在两栋建筑物3 H相互有影响的状况下,当某建筑物周边环境不变时,该建筑物的雷击危险事件的次数随着自身高度的增加而增大;当周边环境改变时,该建筑物的雷击危险事件的次数随着周边建筑的高度的增加而减小。
The number of lightning events per year (ND) is mainly used for the classification of lightning protection levels of buildings and lightning risk assessment. In order to refine the calculation of ND, through the theoretical analysis and the geometric simulation of Auot CAD, three environmental conditions that may exist around the two adjacent buildings were calculated and compared, and the optimal calculation formula . Through the analysis and calculation, it is known that the formula in the specification is significantly different from the calculation formula proposed in this article. Using the calculation formula presented in this paper to calculate ND, the result is more reasonable than the formula Will have a direct impact on the outcome of the assessment. At the same time, the results of the analysis show that the number of lightning danger events of a building increases with the height of a building when the surrounding environment of the building remains unchanged under the influence of 3 H of the two buildings. When the surrounding environment changes, the number of lightning hazard incidents of the building decreases with the height of the surrounding buildings.