- 摘 要
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(广州大学土木工程学院, 广州 510006)
[摘要]巨型型钢混凝土(SRC)框架-核心筒结构是由巨型型钢混凝土框架、钢筋混凝土核心筒和伸臂桁架组成的一种具有多道抗震防线的超高层结构体系。以某超高层建筑为工程背景,建立有限元分析模型,通过反应谱分析、动力弹塑性时程分析和静力弹塑性分析,研究这种结构体系在地震作用下的变形、基底剪力及屈服破坏机制。分析结果表明:结构下部变形较大, 反映出结构下部破坏比上部严重和核心筒破坏比框架严重这两种破坏趋势;结构呈现“连梁→墙肢→框架”的屈服机制,符合多道抗震防线的概念设计;结构的加强层、裙塔楼交接处以及结构底部容易首先破坏,设计中应当注意这些薄弱环节。
[关键词]巨型框架-核心筒结构; 型钢混凝土; 抗震性能; 屈服机制
中图分类号:TU398.7 文献标识码:A 文章编号:1002-848X(2014)02-0025-07
Seismic performance and damage patterns of super high-rise mega SRC frame-core wall structure
Chen Lin, Yang Hang, Wu Shanhu, Zhou Yun
(Department of Civil Engineering, Guangzhou University, Guangzhou 510006, China)
Abstract: Mega steel reinforced concrete (SRC) frame-core wall structure is a type of structural system for super high-rise buildings, consisting of mega SRC frame, reinforced concrete (RC) core wall and outrigger trusses. Finite element analysis model was constructed according to a super high-rise building. Response spectrum analysis, time history analysis and Pushover analysis were carried out to study the deformation, base shear forces and yield failure mechanism of this type of structural system when subjected to earthquake. The results show that the maximum deformation occurred in lower story which indicate the lower part of the structure was destroyed more seriously and the core wall was destroyed more seriously than frame. The structure presented yield sequence as coupling wall-beam to coupling wall-column to frame, corresponding to the seismic concept design of multi-line. The weak parts of the structure such as strengthened story, bottom story and intersection members between podium building and main building, should be paid much attention to during the design.
Keywords: mega frame-core wall structure; steel reinforced concrete; seismic performance; yield mechanism
*广东省自然科学基金团队项目(8351009101000001),广州市珠江科技新星专项(2011J2200023)。
作者简介:陈麟,博士,副教授,Email: zyfychen@163.com。
参考文献
[1]CHARLES W ROEDER. Composite behavior between steel and concrete systems for lateral loads[C]//Proceedings of the Fourth International Conference on Composite Construction in Steel and Concrete. ASCE, 2000:494-505.
[2]辛建雨,钟岱辉,王雪峰,等. 巨型框架结构体系的动力特性及地震响应分析[J].工业建筑,2008,38(S1):443-446.
[3]邹昀,吕西林,钱江. 上海环球金融中心大厦结构抗震性能研究[J]. 建筑结构学报,2006,27(6):74-80,107.
[4]丁洁民,巢斯,赵昕, 等. 上海中心大厦结构分析中若干关键问题[J]. 建筑结构学报,2010,31(6):122-131.
[5]崔大光,孙飞飞,李国强, 等. 巨型型钢混凝土柱双向偏心受压校核分析方法[J]. 力学季刊,2007,28(2):340-345.
[6]徐培福,薛彦涛,肖从真, 等. 带转换层型钢混凝土框架-核心筒结构模型拟静力试验对抗震设计的启示[J]. 土木工程学报,2005,38(9):1-8.
[7]缪志伟,吴耀辉,马千里, 等. 框架-核心筒高层混合结构的三维空间弹塑性抗震分析[J]. 建筑结构学报,2009,30(4):119-129.
[8]陆新征,叶列平,缪志伟, 等. 建筑抗震弹塑性分析-原理、模型与在ABAQUS,MSC.MARC和SAP2000上的实践[M]. 北京:中国建筑工业出版社,2009.
[9]HONGNESTAD E,HANSON N W, MCHENRY D. Concrete stress distribution in ultimate strength design[C]//ACI Journal Proceedings. 1955,22(6):455-479.
[10]MANDER J B, PRIESTLEY M J N, PARK R. Theoretical stress-strain model of confined concrete[J]. Journal of Structural Engineering, ASCE, 1988, 114(8): 1804-1826.
[11]MANDER J B, PRIESTLEY M J N, PARK R. Observed stress-strain behavior of confined concrete[J]. Journal of Structural Engineering, ASCE, 1988, 114(8): 1827-1849.
[12]侯爽,欧进萍. 结构Pushover分析的侧向力分布及高阶振型影响[J]. 地震工程与工程振动,2004,24(3):89-97.