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（中國(guó)建筑科學(xué)研究院， 北京 100013）

［摘要］某超限高層建筑總高3467m，高度超限，外立面沿高度逐漸收進(jìn)后又逐漸外挑，建筑概念獨(dú)特，采用巨型鋼支撐框筒+腰桁架形式。依次對(duì)其進(jìn)行設(shè)防烈度為7度、超烈度75度以及8度罕遇地震輸入，研究整體結(jié)構(gòu)的變形、加速度放大系數(shù)、樓層剪重比和抗側(cè)力構(gòu)件的塑性狀態(tài)等抗震性能。結(jié)果表明，在7度罕遇地震作用下,結(jié)構(gòu)基本處于彈性工作狀態(tài)，能滿足整體結(jié)構(gòu)大震不倒的抗震性能要求；超烈度75度罕遇地震下，局部構(gòu)件出現(xiàn)塑性，表現(xiàn)出一定的延性耗能特征；8度罕遇地震作用下，樓層加速度放大系數(shù)減小、樓層剪重比減小、局部支撐構(gòu)件進(jìn)入塑性屈服階段，結(jié)構(gòu)進(jìn)入良好的屈服耗能狀態(tài)。

［關(guān)鍵詞］巨型鋼支撐框筒； 超高層建筑結(jié)構(gòu)； 超烈度； 動(dòng)力彈塑性分析； 抗震性能

中圖分類號(hào)：TU973.2       文獻(xiàn)標(biāo)識(shí)碼：A      文章編號(hào)：1002-848X(2015)07-0038-05

Seismic performance analysis of mega steel frame bracedtube structure

Ren Chongcui, Xu Ziguo, Xiao Congzhen

 (China Academy of Building Research,  Beijing 100013， China)

Abstract:The building height of an outofcode highrise structure is 3467m, which is beyond the limits of the code. The facades first gradually shrink and then gradually overhang along height, and the  architectural concept is unique. The mega steel frame bracedtube and belt truss structure are adopted. Seismic performance of the structure such as the overall deformation, acceleration amplification factor, story shear weight ratio and plastic state of lateral members were studied under different intensity rare earthquakes of 7 degree, ultraintensity 75 degree and 8 degree. The results show that the structure is under elastic working condition under the 7 degree rare earthquake, which fulfills the seismic performance requirements of not collapsing under the rare earthquake. Several members are in plastic state and show ductility characteristics under the ultraintensity 75 degree rare earthquake. Structure is in good energydissipated state under the 8 degree rare earthquake, such as the decrease of acceleration amplification factor and story shear weight ratio, and that several braces reaching plastic yield stage.

ords:mega steel frame bracedtube; super highrise structure; ultraintensity; dynamic elastoplastic analysis; seismic performance

*十二五國(guó)家科技支撐計(jì)劃課題（2012BAJ07B01），中國(guó)建筑科學(xué)研究院課題（20061902420730043）。

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