GB 50057-2010 第0.05条
**Note**: The specific lightning protection classification of a hotel building shall be determined based on its importance, occupant density and expected lightning strike frequency (N). The calculation method for the expected lightning strike frequency N is given in Appendix A of the standard, involving parameters such as local thunderstorm days and the equivalent area of the building. Generally, if a hotel is a densely occupied public building, it is classified as Class II when N > times/a; as Class III when 0.01 ≤ N ≤ 0.05 times/a; if treated as an ordinary civil building, it is classified as Class II when N > 0.25 times/a, and as Class III when 0.05 ≤ N ≤ 0.25 times/a.