雷击风险评估中位置因子的取值变化分析  

Lightning Risk Assessment in Location Factor

作　　者：李鑫[1] 黄克俭[1] 叶博[1] 刘毅[1] 喻潜 汪金宏 申森[1] Li Xin Huang Ke-jian Ye Bo Liu Yi Yu Qian Wang Jin-hong Shen Sen

机构地区：[1]湖北省防雷中心,武汉430074

出　　处：《建筑技术开发》2016年第8期52-53,共2页Building Technology Development

摘　　要：在对建筑物进行雷击风险评估的过程中,位置因子C_d的引入是为了考虑周围建筑物对评估对象的影响,但由于不同建筑物的高度和位置不同,位置因子的取值不同对评估对象的影响差别很大,现有雷击风险评估规范中给出的位置因子的取值,为固定值,导致了计算结果缺乏差异性,存在较大误差。鉴于上述问题,通过电气-几何模型得出了位置因子的计算公式,并结合武汉地区雷电流累积模型分析了位置因子与评估对象高度及距离的变化关系。发现当评估对象周边有比它高的建筑物时,位置因子与评估对象自身的高度以及间距息息相关,其自身高度越接近与等高建筑物时或间距越大时其被雷击的风险值越高,其C_d应相应取较高值。Building lightning risk assessment in the process of location factors of Cd were introduced in order to consider the effect of surrounding buildings object to the assessment,but due to different buildings of different height and position,the Cd value difference is very big,the impact of different object to the assessment of existing lightning risk assessment value of the location of the factor given in the specification,for a fixed value,leads to the calculation results the lack of diversity,there is a big error.In view of the above problems,this paper obtained by electric,electrically- geometric model formula for calculating the position of factors,combined lightning current accumulated in Wuhan model analyzes the changing relationship between the position and height of the object factors and assess the distance.It found that when the object is surrounded by high assessment than its buildings,the position factor and evaluation of height and distance of the object itself is closely related to its height or spacing greater the closer the contour with the building when it was struck by lightning risk higher values which should be appropriate to take a higher value Cd.

关 键 词：风险评估 位置因子 电气-几何模型 

分 类 号：P429[天文地球—大气科学及气象学]