马鞍山长江大桥防雷类别的探讨

Discussion on lightning protection category of Changjiang River Bridge in Ma'anshan

防雷类别的划分是进行雷电防护的重要基础工作。马鞍山长江大桥是一座高大的构筑物,遭受雷击的概率比普通建筑物更大。在防雷类别划分实践中,为克服闪电定位时间短、稳定性不强及气象台站雷暴日观测资料的局限性,采用加权平均法求出较合理的雷闪密度。文章结合对大桥沿线雷电电磁环境、雷灾、地质的调查勘测和对土壤电阻率分布特点的分析,确定校正系数k值,根据大桥结构特点,对大桥分段计算年预计雷击次数,最终确定防雷类别。

The classification of lightning protection is an important basic work for lightning protection.Changjiang River Bridge,Ma’anshan,is a tall building.So the probability of lightning strike is greater than that of the ordinary buildings.In the classification practice of lightning protection,in order to overcome the short time of lightning location data,not strong stability and the limitation of the thunderstorm day observation data of the meteorological station,a more reasonable lightning density is obtained by the weighted average method.Combined with the investigation and survey of lightning electromagnetic environment,lightning disaster and geology along the bridge,and the analysis of the distribution characteristics of soil resistivity,the correction coefficient k value is determined.According to the structural characteristics of the bridge,the number of lightning strokes is calculated and the lightning protection category is finally determined.