网架结构在雪荷载超载时的连续倒塌性能

Progressive Collapse Performance of Steel Grid Structures under Snow Overload

采用ANSYS有限元软件,对某中学艺术楼屋顶网架在雪荷载超载时的连续倒塌性能进行了分析,考虑雪荷载分别超载15%、30%和50%3种情况。分析结果表明:该网架结构在雪荷载超载15%时,不会发生连续倒塌;雪荷载超载30%时,存在发生连续倒塌的可能;雪荷载超载50%时,将发生连续倒塌。该网架结构既有较好的经济型,又有合理的安全性。

Progressive collapse performance of a steel grid structure was analyzed under snow overload. The snow overload of 15% ,30% and 50% are considered. The analysis results showed that the grid structure has a high performance for resisting progressive collapse in case of 15% snow overload. When at 30% snow overload,the grid structure has a high potential for progressive collapse. But at 50% snow overload would result progressive collapse. The grid structure has good economy and reasonable safety.