防屈曲支撑在超高层建筑结构伸臂桁架中的应用  

Application of unbonded brace in super high-rise structure with cantilever truss

作　　者：任重翠[1] 徐自国[1] 肖从真[1] 孙建超[1] 金林飞[1] 高杰[1] 

机构地区：[1]中国建筑科学研究院,北京100013

出　　处：《建筑结构》2013年第5期54-59,96,共7页Building Structure

摘　　要：带加强层的超高层建筑结构多采用伸臂桁架结构形式。出于提高结构抗震性能的需要,工程中常采用拉压性能稳定的防屈曲支撑代替易失稳的普通钢支撑作为伸臂桁架的斜腹杆。采用有限元分析软件ABAQUS的动力弹塑性分析方法,比较了某超高层结构分别采用防屈曲支撑和普通钢支撑作为伸臂桁架斜腹杆,在设防烈度和超烈度罕遇地震作用下的结构变形特征、构件内力及剪力墙损伤等非线性动力响应。分析结果表明,与普通钢支撑相比,防屈曲支撑刚度和强度指标易控制,大变形下滞回性能稳定,罕遇地震作用下能率先屈服吸收地震能量,抗震性能良好。Cantilever truss was often adopted for super high-rise structure with the strengthening layer. Because of the stable tension and compression performance, unbonded braces were widely accepted in projects to replace the ordinary steel supports to increase structure seismic performance. Nonlinear time-history analysis method by software ABAQUS was used to analyze the seismic performance of structure with unbonded braces or ordinary steel supports under the rare earthquake, including the deformation, member force and shear wall damage etc. The results show that compared with the ordinary steel supports, the unbonded braces have good seismic performance, and the stiffness and strength can be easily controlled. Hysteretic behaviors are stable under large deformation, and can absorb the seismic energy firstly under the rare earthquake.

关 键 词：超高层建筑结构 防屈曲支撑 动力弹塑性分析 抗震性能 

分 类 号：TU973.2[建筑科学—结构工程]