摘要
通过对重庆地区1999—2008年闪电定位系统监测地闪资料进行数理统计,重点对采用IEEE和DL/T620提供的公式获取的雷击建筑物绕击率进行对比分析,并对重庆全市进行雷击建筑物绕击率区划。结果表明:雷击建筑物绕击率随着滚球半径增大而增加;对于相同滚球半径,IEEE方法获取的雷击建筑物绕击率略高于实际,而低于GB/T21714提供的绕击率;在滚球半径小于120m时,IEEE方法得到绕击率明显低于DL/T620方法,反之则高于DL/T620方法;采用IEEE公式获取的雷击建筑物绕击率与实际较为吻合,在此基础上获得了能客观反映重庆地区雷击建筑物绕击率表达式,并对不同防雷类别建筑物雷击绕击率进行了区划,为雷电灾害风险评估和防雷设计提供了可靠理论依据。
A comparative analysis is made of the shielding failure rates obtained with IEEE and DL/T620's formulas,and a regionalization is conducted on the shielding failure rate over Chongqing with the data of LLS(Lightning Location System) from 1999 to 2008.The results show that the shielding failure rate increased with the increasing rolling sphere radius.When the rolling sphere radius was the same,the shielding failure rate provided by IEEE was higher than the reality and lower than that by DL/T620's.When the rolling sphere radius was lower than 120 m,the shielding failure rate provided by IEEE was lower than that by DL/T620;on the contrary,the shielding failure rate provided by IEEE was higher than that by DL/T620's.The shielding failure rate provided by IEEE was close to the reality.Based on that,a satisfactory shielding failure rate expression is given,with which the shielding failure rates of various types of buildings are regionalized.The results can be used as theoretical bases for lightning disaster risk assessment and lightning protection design.
出处
《气象科技》
2013年第2期412-416,共5页
Meteorological Science and Technology
基金
国家公益性行业专项课题(GYHY201006005-05)
国家标准"桥梁工程防雷技术规范"编制项目
重庆市气象科研项目(YWGG201208
YWGG201227)资助
关键词
雷击
建筑物
绕击率
滚球半径
lightning stroke,building,shielding failure rate,rolling sphere radius
