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(中國(guó)建筑西北設(shè)計(jì)研究院有限公司, 西安 710018)

摘要: 陜建絲路創(chuàng)發(fā)中心 1#樓結(jié)構(gòu)高度 200m,采用框架-核心筒混合結(jié)構(gòu)體系,底部 5 層外框架存在部分樓板不連續(xù),形成多層通高,進(jìn)而產(chǎn)生薄弱層、軟弱層、大長(zhǎng)細(xì)比穿層柱等超限項(xiàng)。 重點(diǎn)分析了底部通高層采用不同組裝模式時(shí)結(jié)構(gòu)側(cè)向剛度比的分布變化情況,探討了底部通高層對(duì)外框架分擔(dān)剪力比、傾覆力矩比的影響。 通過等效彈性反應(yīng)譜分析、彈塑性時(shí)程分析,對(duì)結(jié)構(gòu)在中、大震下的抗震性能進(jìn)行了分析與評(píng)估。 對(duì)底部加強(qiáng)部位剪力墻、框架柱采取了加強(qiáng)措施,對(duì) 30m 通高穿層柱進(jìn)行了大震穩(wěn)定性分析,保證結(jié)構(gòu)底部薄弱部位不發(fā)生集中破壞。 結(jié)果表明,對(duì)核心筒剪力墻和框架柱采取加強(qiáng)措施后,可較好地解決底部存在多層通高穿層柱的框架-核心筒結(jié)構(gòu)薄弱層或軟弱層問題;鋼板剪力墻能明顯提高剪力墻的剛度和承載力,控制大震作用下剪力墻底部加強(qiáng)部位在中度損傷范圍內(nèi)。 結(jié)構(gòu)可以實(shí)現(xiàn)預(yù)期的性能目標(biāo)。

關(guān)鍵詞: 框架-核心筒混合結(jié)構(gòu); 多層通高穿層柱; 側(cè)向剛度比; 大震穩(wěn)定性中圖分類號(hào):TU972+. 9 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)11-0072-07

DOI:10. 19701 / j. jzjg. XBY2228

Design and analysis of super high-rise structure with the cross-multi-story columns at the bottom

XIN Li, HAN Gangqi, REN Tongrui, SHI Shengzhi, CHENG Qianqian

(China Northwest Architectural Design and Research Institute Co. , Ltd. , Xi’ an 710018, China)

Abstract: Shaanxi Construction Silk Road Chuangfa Center 1 # building with a structural height of 200m adopted theframe-core tube hybrid structure system. The external frame of the bottom five floors characterized by a large number of floor discontinuities, forming multi-story through height. Thus resulting in some ultra-limit items such as weak layers and large slenderness ratio cross-multi-story columns. The lateral stiffness ratio distribution of the structures with different assembly modes for through height layers at the bottom were mainly analyzed, and the effects of multi-story through height at the bottom on shear ratio and overturning moment ratio of external frame was investigated. The structural seismic performance during the design and rare earthquakes was analyzed and evaluated using the equivalent elastic response spectrum analysis and inelastic time history analysis. The shear walls and frame columns at the bottom strengthening zones were strengthened. Moreover, the stability analysis subjected the rare earthquakes of a 30m cross-multi-story column was carried out, to ensure that the concentrated failure will not occur in spite of the weak part at the bottom of the structure. The results show that the problem of weak layers of the frame-core tube structure with the cross-multi-story columns at the bottom can be addressed adopting strengthening the core tube shear wall and frame column. The steel plate shear wall can significantly improve the stiffness and bearing capacity of the shear wall, and control the bottom reinforced part of the shear walls within the moderate damage under rare earthquakes. The expected performance objectives of the structures can be achieved.

Keywords: frame-core tube hybrid structure; cross-multi-story column; lateral stiffness ratio; stability during rare earthquake