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（1 中國(guó)建筑科學(xué)研究院， 北京 100013；  2 清華大學(xué)土木工程系， 北京 100084）

［摘要］針對(duì)地震作用下某多塔結(jié)構(gòu)工程實(shí)例中出現(xiàn)的層剪力“內(nèi)縮”現(xiàn)象，利用SATWE軟件構(gòu)造一個(gè)簡(jiǎn)化的多塔大底盤結(jié)構(gòu)模型，并在模型中重現(xiàn)了該現(xiàn)象。對(duì)多塔模型進(jìn)行了時(shí)程分析和反應(yīng)譜分析，時(shí)域上各塔振動(dòng)的不同步、頻域上各塔底部剪力在某些振型下存在相位差是導(dǎo)致層剪力內(nèi)縮的主要原因。研究了水平地震作用下帶裙房樓層的剪力分布，結(jié)果表明裙房頂層豎向構(gòu)件分擔(dān)的剪力與其抗側(cè)剛度不成比例，兩塔之間的柱剪力顯著偏大。分析了裙房對(duì)塔樓的嵌固作用對(duì)塔樓層剪力產(chǎn)生的影響，并解釋了塔樓發(fā)生剪力突變的原因，提出設(shè)計(jì)建議。

［關(guān)鍵詞］大底盤多塔結(jié)構(gòu)； 地震作用； 層剪力內(nèi)縮； 嵌固作用

中圖分類號(hào)：TU311-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)11-0007-06

Seismic analysis on the distribution of story shear of two-tower structures with large base

Xiao Congzhen1, Deng Fei1,2, Chen Caihua1

(1 China Academy of Building Research, Beijing 100013, China; 

2 Department of Civil Engineering, Tsinghua University, Beijing 100084, China)

Abstract:A simplified two-tower structure was established in SATWE where story shear reduction was intentionally created under seismic action, exemplifying an actual project in which the same phenomenon was detected. Time history analysis and response spectrum analysis were carried out, indicating that non-synchronization in time-domain and phase difference in frequency-domain were the main reasons to this phenomenon. Shear force distribution within the skirt building under horizontal seismic action was studied, revealing that shear forces of the columns were not in proportion to their lateral stiffness\|columns between the two towers bear much larger shear force. Fix-end effect of the skirt building to the tower was studied to account for the radical change of shear force of the towers.

Keywords:multi-tower structure with large base; seismic action; story shear reduction; fix-end effect

作者簡(jiǎn)介：肖從真，博士，研究員，Email:xiaocongzhen@cabrtech.com。