防屈曲支撑在超高层建筑结构伸臂桁架中的应用
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任重翠，徐自国，肖从真，孙建超，金林飞，高杰（中国建筑科学研究院， 北京 100013）［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。［关键词］超高层建筑结构； 防屈曲支撑； 动力弹塑性分析； 抗震性能中图分类号：TU973.2 文献标识码：A 文章编号：1002-848X(2013)05-0054-06Application of unbonded brace in super high-rise structure with cantilever trussRen Chongcui, Xu Ziguo, Xiao Congzhen, Sun Jianchao, Jin Linfei, Gao Jie(China Academy of Building Research, Beijing 100013, China)Abstract: 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.Keywords: super high-rise structure; unbonded brace; nonlinear time-history analysis; seismic performance作者简介：任重翠,硕士,工程师，Email:renchongcui@yahoo.cn。参考文献［1］徐培福，傅学怡，王翠坤，等. 复杂高层建筑结构设计［M］. 北京：中国建筑工业出版社，2005.［2］傅学怡. 实用高层建筑结构设计［M］. 北京：中国建筑工业出版社，2010.［3］汪家铭，中岛正爱. 屈曲约束支撑体系的应用与研究进展(I) ［J］. 建筑钢结构进展, 2005,7(1):1-12.［4］武莲霞，余志伟，孙飞飞. 屈曲约束支撑在带伸臂高层建筑中的应用［J］. 建筑结构, 2011, 41(S1):120-124.［5］赵俊贤，吴斌，欧进萍. 新型全钢防屈曲支撑的拟静力滞回性能试验［J］. 土木工程学报, 2011, 44(4):60-70.［6］徐自国，张莉若，黄小坤，等.郑州国家干线物流港综合楼工程的动力弹塑性分析［C］//第二十届全国高层建筑结构学术会议. 2008:573-584.［7］任重翠，杜义欣，徐自国，等.南京德基广场二期塔楼结构动力弹塑性分析及抗震性能评价［C］//第二十一届全国高层建筑结构学术会议. 2010:754-760.
