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(1 中國(guó)建筑科學(xué)研究院有限公司， 北京 100013； 2 國(guó)家建筑工程技術(shù)研究中心， 北京 100013)

［摘要］框架-核心筒結(jié)構(gòu)是典型雙重抗側(cè)體系，框架和核心筒按剛度協(xié)同工作共同承擔(dān)地震剪力。地震作用下核心筒連梁發(fā)生損傷，其剛度下降導(dǎo)致剪力在核心筒和框架之間重分布，框架應(yīng)具備一定的強(qiáng)度以承接從核心筒轉(zhuǎn)移的地震力，從而發(fā)揮抗震二道防線的作用，因此中美設(shè)計(jì)規(guī)范都規(guī)定應(yīng)對(duì)框架的設(shè)計(jì)地震剪力進(jìn)行調(diào)整?；谡w剛度相近的原則設(shè)計(jì)了4個(gè)不同框剪比的框架-核心筒模型，對(duì)比了現(xiàn)行中美規(guī)范的框架剪力調(diào)整方法差異，結(jié)果表明在結(jié)構(gòu)中下部，中國(guó)規(guī)范的框架剪力放大系數(shù)低于美國(guó)規(guī)范；在結(jié)構(gòu)中上部，中國(guó)規(guī)范的框架剪力放大系數(shù)高于美國(guó)規(guī)范。通過(guò)彈塑性時(shí)程分析得到4個(gè)模型在大震下框架實(shí)際分擔(dān)的剪力，對(duì)于外框剛度較小的模型，按中美規(guī)范調(diào)整后的框架設(shè)計(jì)剪力大于大震下實(shí)際分擔(dān)剪力；而對(duì)于外框剛度較大的模型，按中美規(guī)范調(diào)整后的部分樓層的框架設(shè)計(jì)剪力低于大震下實(shí)際分擔(dān)剪力。根據(jù)框架-核心筒結(jié)構(gòu)大震下塑性發(fā)展導(dǎo)致的內(nèi)力重分布規(guī)律，分別基于彈塑性時(shí)程分析和等效線性化分析提出了兩種實(shí)用的框架剪力調(diào)整方法，可供設(shè)計(jì)參考。 

［關(guān)鍵詞］框架-核心筒結(jié)構(gòu)； 框架剪力調(diào)整； 二道防線； 框剪比； 框架剪力放大系數(shù) 

中圖分類(lèi)號(hào)：TU973-3l，TU318-1，P315-9 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)11-0008-07

Research on frame shear adjustment method of the frame-core tube structure 

CHEN  Caihua1,2,  WANG  Cuikun1,2,  PAN  Yuhua1,2,  XIONG  Yuhao1,2,  PAN  Congjian1,2 

(1 China Academy of Building Research， Beijing 100013， China； 2 National Engineering Research Center of Building Technology， Beijing 100013， China) 

Abstract:The frame-core tube structure is a typical dual lateral anti-side system, and the frame and core tube share the seismic shear force according to the relative stiffness. The coupling beam is damaged and the stiffness of core tube decreases under the action of earthquake， which leads to the redistribution of shear force between the core tube and the frame. As a secondary aseismic system, the frame should have a certain strength to undertake the seismic force transferred from the core tube. Therefore, both Chinese and American design codes stipulate that the design seismic shear force of the frame should be adjusted. Based on the principle of equal stiffness, four frame-core tube models with different frame-shear ratio were designed, and the differences of frame shear adjustment methods in current Chinese and American codes were compared. The results show that the frame shear amplification coefficient of Chinese code is lower in bottom and higher in top than that of American code. According to the elastic-plastic time history analysis, the actual frame shear of the four models under the strong earthquake is obtained, which shows that the frame shear adjusted by the Chinese and American codes was greater than the actual frame shear for the model with small frame stiffness and lower than the actual frame shear for the model with large frame stiffness. According to the redistribution law of internal force caused by plastic development of frame-core tube structure under strong earthquake, two practical shear force adjustment methods based on elastic-plastic time history analysis and equivalent linearization analysis are proposed, which can be used as reference for design. 

Keywords:frame-core tube structure； frame shear adjustment； secondary aseismic system； frame-shear ratio; frame shear amplification coefficient

作者簡(jiǎn)介：陳才華，博士，研究員，Email:chencaihua@cabrtech.com。