基于Benchmark模型的拆除构件法分析

Analysis of Benchmark building using alternate path method

为确定结构最不利失效柱位置,以9层Benchmark模型为研究对象,采用拆除构件法进行模型底层各柱分别失效影响的动力分析,并与静力分析结果进行对比。分析结果表明:框架柱失效时间越短,结构失效点的位移响应越大;结构的最不利失效柱位置为结构的边柱;柱的失效使梁的传力模式发生改变,梁由受弯传力变为悬链线式受拉传力;柱的失效同时使与之相连的节点受力状态发生了改变,节点由承受支座负弯矩变为承受拉弯共同作用。

In order to determine the most critical case due to sudden column loss, a dynamic analysis, in comparison with a static study, is performed based on the 9-storey Benchmark model using ＂Alternate Path Method＂ with single underlying structure column removed seriatim. It is shown that due to the column loss, the displacement response of failure structural connection increases with the decrease of the column failure time; the loss of side column results in the most damage to the structure ; the load transfer mechanism of the adjacent beam changes from bending to catenary tension action; simultaneously, the load status of the failure connection changes from negative moment to the combined action of tension and positive moment.