雷击风险评估中位置因子的精细化分析  

Refinement Analysis of Location Factor in Lightning Risk Assessment

作　　者：史雅静[1,2] 肖稳安[1] 柴健[2] 杨靖[2] 

机构地区：[1]南京信息工程大学,南京210044 [2]湖北省防雷中心,武汉430074

出　　处：《电瓷避雷器》2015年第2期114-118,共5页Insulators and Surge Arresters

基　　金：湖北省气象局科技发展基金项目(编号:FL-Z-201403)

摘　　要：在雷击风险评估中,考虑到周围建筑物对评估对象截收面积的影响而引入了位置因子,但是由于周围建筑物的高低、远近等的不同,对评估对象截收面积的影响差别很大,根据现行雷击风险评估标准中给出的位置因子的取值,为典型经验值,导致了计算结果缺乏针对性,误差较大。针对以上问题,本文通过公式推导得出了位置因子的精细化计算模型,并通过对常见建筑物进行参数取样分析,探索式的引出了位置因子和评估对象高度的关系。发现当评估对象周边环境一定时,位置因子跟评估对象自身的尺寸参数息息相关,其中与评估对象的高度呈指数函数关系。Considering the influence of surrounding buildings on the calculated building＇s equivalent area, the location factor Cd is introduced in lightning risk assessment. However, because of the difference height and distance of surrounding buildings, the impact on the equivalent area difference is obvious. According to the location factor value given in present standard of lightning risk assessment is a typical experience value, which leads to the calculation results lack of pertinence, and with big error. To solve above problems, a refinement calculate model was given in this article by formula deduction ,and by sample analysis on the common building parameters, the relation of the location factor and the calculated height of building is concluded exploringly. It is also found that location factor is closely related with its own size parameters when the surrounding environment is certain, the function relation of the location factor and height of the evaluation object is exponential function.

关 键 词：风险评估 位置因子 精细化 

分 类 号：P427.32[天文地球—大气科学及气象学] TU895[建筑科学]