超高层结构考虑加强层构件失效后的结构性能

发布时间：2018-06-11 23:12

本文选题：超高层 + 加强层　；参考：《建筑结构》2017年S2期

【摘要】：在超高层结构设计中,加强层的布置往往相对集中,容易引起刚度突变。根据已有的强震记录及工程试验,选定伸臂桁架上方框架柱为薄弱部位,假定在强震作用下,结构因刚度突变引起加强层局部构件失效,通过构件删除法分析了剩余结构的竖向承载能力和抗震能力,指出了局部构件失效进而导致加强层以上外圈结构在余震作用下可能倒塌的连锁反应过程。提出在加强层设计中,应同时重视加强层设置引起的加强层与其上、下层之间的刚度突变。建议在加强层上方设置数层环带桁架,既可以有效减弱刚度突变,也可托举强震下可能失效的框架柱的上方结构,避免结构连续倒塌。
[Abstract]:In the design of super high rise structure, the arrangement of the reinforced layer is often relatively concentrated and easily causes the stiffness mutation. According to the existing strong earthquake record and engineering test, the frame column above the arm truss is selected as the weak part. It is assumed that under the strong earthquake, the structure caused by the stiffness mutation causes the failure of the local component of the reinforced layer, and the residual method is analyzed by the element deletion method. The vertical bearing capacity and aseismic capacity of the structure indicate that the failure of the local component leads to the chain reaction process that may collapse under the aftershock of the outer ring structure above the strengthening layer. It is suggested that in the design of the reinforced layer, the stiffness mutation between the strengthening layer and the upper layer and the lower layer should be paid attention to at the same time. It is suggested that the reinforcement layer be above the strengthening layer. The installation of several layers of girdle trusses can not only effectively reduce the abrupt change of stiffness, but also lift up the upper structure of frame columns which may fail under strong earthquakes, so as to avoid progressive collapse of structures.
【作者单位】：中国建筑西南设计研究院有限公司;
【分类号】：TU973

【相似文献】