（1 保利（北京）房地产开发有限公司, 北京 100088；  2 北京市建筑设计研究院有限公司， 北京 100045；  3 中国建筑科学研究院， 北京 100013）

［摘要］北京保利国际广场斜交网格外筒由约45°角交叉编织的钢管混凝土斜柱和水平环梁组成,外网格节点汇集了斜柱、水平环梁、水平径向梁等构件，且需灌注混凝土，构造复杂。为了实现节点承载力大于构件承载力的强节点设计原则,采用一种新的节点构造形式，对节点进行概念设计，提出交叉网格外筒节点区域内混凝土竖向抗压强度参与系数的计算方法。为验证节点构造的合理性,了解节点实际工作状态、破坏机理、承载能力和混凝土发挥的作用,进行6个比例为1∶5-5的节点模型试验，并进行有限元分析。结果表明，交叉网格外筒节点的试验值与有限元计算值吻合良好，节点的设计方法可行，节点构造合理，相关经验可用于其他工程相似节点的设计分析。

［关键词］北京保利国际广场； 交叉网格外筒； 钢管混凝土柱； 网格节点； 有限元分析

中图分类号：TU318文献标识码：A文章编号：1002-848X(2016)16-0052-05

Node design of diagrid outer tube of Beijing Poly International Plaza

Qiu Honggang1, Zhen Wei2, Sheng Ping2, Tian Chunyu3, Chen Tao3

(1 Poly Beijing Real Estate Development Co., Ltd.， Beijing 100088, China; 2 Beijing Institute of Architectural Design, Beijing 100045, China; 3 China Academy of Building Research, Beijing 100013, China)

Abstract:The diagrid outer tube of Beijing Poly International Plaza is composed of concrete filled tubular (CFT) inclined column and horizontal ring beam that are crossly woven in about 45 degrees angle. Outer grid nodes include components of inclined columns, horizontal ring beams and horizontal radial beams. The components are complicated structures and need concrete pouring. In order to achieve the strong node design principle of node bearing capacity greater than that of components, a new node form was adopted and concept design was conducted on the node. The calculation method of the participation coefficient of the vertical compressive strength of concrete in the node region of diagrid outer tube was put forward. In order to verify the rationality of node structure and understand node’s actual working state, failure mechanism, bearing capacity and the role played by concrete, node model test on six models with ratio of 1∶5-5 were carried out as well as finite element analysis. The results show that the test and finite element calculation results of diagrid outer tube node are in good agreement, and the node design method is feasible with reasonable structure. The relevant experience can be used in design and analysis of similar nodes in other engineering.

Keywords:Beijing Poly International Plaza; diagrid outer tube; CFT column; diagrid node; finite element analysis

作者简介：邱宏刚，硕士，工程师，Email:qiuhonggang@263.net。