基于K-S检验法的雪荷载统计分析

Statistical analysis of snow load based on K-S inspection method

近年来由于强风暴雪等极端天气频繁发生,致使许多结构尤其是轻钢结构在这种极端气候下发生破坏,究其破坏原因是多方面的,比如设计因素、施工质量等,荷载取值的不足也是其中之一.由于气候的变化,现行荷载规范的雪荷载取值是否可能被低估是当前工程界普遍关心的问题.为验证这种假设的真实性,以中国辽宁省2007年发生的一场56年罕见的暴雪为背景,对辽宁省内8个主要城市近50年雪荷载实测值进行统计分析,利用K-S检验法对辽宁地区雪荷载的概率分布函数进行假设检验,根据极值Ⅰ型分布分析这8个城市的代表值.将计算结果与GB 50009—2001《建筑结构荷载规范》比较,结果表明荷载规范取值在一些城市偏低.

In recent years,due to the extreme weather like snowstorm and high wind,which resulted in many structures damage and collapse,especially for light-weight steel structures.The reasons of structural failures were in many ways such as design factors and construction quality,inadequate load value assignment was one of the reasons,too.Whether the load value was under estimated in the existing codes instead of the real loading conditions due to the climate change in recent years is a problem generally conserned in the engineering field at present.In order to justify this conjecture,a statistical analysis was carried out based on the observation data of recent 50 years in Liaoning province of China.The annual maximum snow load data of 8 major cities in Liaoning province were collected and the K-S inspection method was adopted to examine the probability distribution function of snow load.Then,the nominal values of snow load in these eight cities were analyzed according to the Extreme I type distribution.Compared with the stipulation in Chinese Load Code（GB 50009—2001）,it was showed that the stipulated load code value was smaller in some cities.