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超高层结构底部人字柱的受力性能分析
孙珂,江洋
摘 要

(北京市建筑设计研究院有限公司, 北京 100045)

[摘要]依托于建筑造型,高层建筑结构底部柱可能分叉形成人字柱。该类人字柱形状不规则,节点处传力复杂,需根据结构性能目标进行罕遇地震作用的受力性能分析。首先给出超限工程中底部人字柱及其相关构件的抗震性能目标;然后在整体模型中分析人字柱稳定承载力及与核心筒拉结可靠性;最后借助非线性有限元软件ABAQUS,建立精细化型钢混凝土人字柱有限元模型,合理模拟与人字柱相关的系梁布置、节点形式等构造措施,重点分析罕遇地震作用下人字柱的节点传力方式、受力性能及损伤程度等,分析人字柱对不同构造措施的敏感性。探讨该类人字柱在结构设计及弹塑性分析过程中可采取的合理措施和分析方法。

[关键词]超高层结构; 底部人字柱; 性能目标; 精细化分析; 敏感性分析

中图分类号:TU398+.9文献标识码:A文章编号:1002-848X(2017)18-0093-06

 

Study on mechanical behavior of bottom herringbone column in super high-rise structure

Sun Ke, Jiang Yang

(Beijing Institute of Architectural Design, Beijing 100045, China)

Abstract:Depended on architectural image, the bottom column of the super high-rise structure may bifurcate into the herringbone column. The herringbone column has the characteristics of large size and irregular shape, which makes the mechanism of loads transfer in the joints more complex. Therefore, it is necessary to analyze the mechanical performance of the herringbone column under the rare earthquake subject to the performances target. Firstly, the seismic performance targets of the bottom herringbone column and related members of the out-of-code project were provided. Secondly, the stability and bearing capacity of the herringbone column and its reliability of connection with the corewall were analyzed in the overall model. Finally, by using the nonlinear finite element software ABAQUS, the refined finite element models of the steel reinforced concrete herringbone columns was established to reasonably simulate construction measures of the pull beams arrangement related to herringbone columns and joint forms. The joint force transfer mode, mechanical behavior and damage degree of the herringbone columns under the rare earthquake were analyzed emphatically, and the sensitivity of herringbone column to different construction measures was further analyzed. The reasonable measures and analysis methods were discussed in the process of structural design and elastic-plastic analysis of this kind of herringbone columns.

Keywords:super high-rise structure; bottom herringbone column; performance target; refined analysis; sensitivity analysis

 

作者简介:孙珂,博士,工程师,Email: sunke@biad.com.cn。

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