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（北京市建筑設(shè)計(jì)研究院有限公司， 北京 100045）

［摘要］依托于建筑造型，高層建筑結(jié)構(gòu)底部柱可能分叉形成人字柱。該類人字柱形狀不規(guī)則，節(jié)點(diǎn)處傳力復(fù)雜，需根據(jù)結(jié)構(gòu)性能目標(biāo)進(jìn)行罕遇地震作用的受力性能分析。首先給出超限工程中底部人字柱及其相關(guān)構(gòu)件的抗震性能目標(biāo)；然后在整體模型中分析人字柱穩(wěn)定承載力及與核心筒拉結(jié)可靠性；最后借助非線性有限元軟件ABAQUS，建立精細(xì)化型鋼混凝土人字柱有限元模型，合理模擬與人字柱相關(guān)的系梁布置、節(jié)點(diǎn)形式等構(gòu)造措施，重點(diǎn)分析罕遇地震作用下人字柱的節(jié)點(diǎn)傳力方式、受力性能及損傷程度等，分析人字柱對(duì)不同構(gòu)造措施的敏感性。探討該類人字柱在結(jié)構(gòu)設(shè)計(jì)及彈塑性分析過(guò)程中可采取的合理措施和分析方法。

［關(guān)鍵詞］超高層結(jié)構(gòu)； 底部人字柱； 性能目標(biāo)； 精細(xì)化分析； 敏感性分析

中圖分類號(hào)：TU398+.9文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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

作者簡(jiǎn)介：孫珂，博士，工程師，Email: sunke@biad.com.cn。