中文摘要：

近年来，由强风、暴雪等极端天气导致的结构破坏倒塌事件屡有发生，如何应对新的气候条件对建筑结构的挑战成为工程界普遍关心的问题．本文以2007年辽宁省发生的56年未遇暴雪灾害为背景，对辽宁省内8个主要城市近50年的雪荷载实测值进行了统计分析，利用极值I型概率分布模型对规范雪荷载取值问题进行了探讨；还结合一个在此次雪灾中破坏的网架结构，进行了破坏原因分析和工程加固设计，对同类工程的设计雪荷载取值和除雪措施提出了建议．

英文摘要：

In recent years, many structures damaged in the extremely bad weather like storm or heavy rain etc. Dealing with the new climate conditions on the structure become universal concern. The article is based on a very big storm in 2007 which never happen in the past 56 years in Liaoning province. Eight main cities of Liaoning province are selected to analyze snow load in nearly 50 years, and standard snow load value is discussed with the use of extreme type I probability distribution model. Taking a space truss structure failed in the snow disaster as example, the damage reason is analyzed and engineering reinforcement is designed. Some suggestions are put forward for snow load value determination of similar engineering and snow removal measures.