（中国建筑设计研究院，北京 100044）

[摘要]  伸臂桁架在框架-核心筒结构的抗震设计中主要用于增加结构的抗侧刚度，但由于其竖向刚度的不规则容易成为结构的薄弱环节。屈曲约束支撑结构布置灵活，是一种优良的耗能减震构件。本文结合该类结构在水平荷载下的变形特点将屈曲约束支撑设置于外柱和伸臂桁架之间，利用其滞回耗能及结构体系的变形特点实现耗能减震控制，同时结合工程实例利用平面模型对该减震方案和原方案进行IDA分析和PUSHOVER分析，研究结果表明，该减震方案改善了整体结构抗震性能，利于损伤可控和多道设防目的的实现。

[关键字]  屈曲约束支撑;伸臂桁架;刚度突变;减震设计;IDA分析;PUSHOVER分析

中图分类号：TU973.3+1      文献标识码：A      文章编号：1002-848X（2013）S1-1176-07

作者简介：邓仲良，硕士，工程师，Email: dengzl@cadg.cn。

Research on the seismic reduction design of frame-core structure with the outrigger

Deng Zhongliang, Fan Zhong, Hu Chunyang

(China Architectural Design & Research Group, Beijing, 100044, China)

Abstract: Outriggers were applied widely to increase the lateral stiffness for a seismic design of frame-core structures, however, incidental irregular vertical stiffness may induce vulnerable damage. Buckling-restrained braces(BRB) have flexible structural arrangement, while they’re also excellent energy dissipation structural components. The BRB is set as a link member between the exterior column and the outrigger in this paper, which incorporates the structural deformation pattern under the lateral load with hysteretic energy dissipation for seismic reduction control. Furthermore, combined with a practical project, IDA analysis and PUSHOVER analysis are applied to analyze the seismic reduction effect, study results show that the proposal improves overall structural aseismic properties, which is also beneficial for damage control and multi-defense realization of earthquake-resistant.

Keywords: buckling-restrained braces; outriggers; stiffness break; seismic reduction design; IDA; Pushover