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(中國(guó)建筑科學(xué)研究院有限公司， 北京 100013)

［摘要］我國(guó)《建筑抗震設(shè)計(jì)規(guī)范》（GB 50011—2010）中規(guī)定，對(duì)于質(zhì)量和剛度分布明顯不對(duì)稱(chēng)的結(jié)構(gòu)，地震效應(yīng)的計(jì)算應(yīng)計(jì)入雙向水平地震作用下的扭轉(zhuǎn)影響，即采用扭轉(zhuǎn)耦聯(lián)振型分解法計(jì)算雙向水平地震作用下的扭轉(zhuǎn)耦聯(lián)地震效應(yīng)。簡(jiǎn)要介紹了國(guó)內(nèi)外設(shè)計(jì)規(guī)范中采用反應(yīng)譜計(jì)算雙向水平地震作用效應(yīng)的幾種方法，并提出了一種基于雙向地震作用的新方法；通過(guò)構(gòu)造兩個(gè)簡(jiǎn)單算例，將各種方法的計(jì)算結(jié)果與彈性時(shí)程分析的結(jié)果進(jìn)行對(duì)比，指出了現(xiàn)行《建筑抗震設(shè)計(jì)規(guī)范》（GB 50011—2010）方法計(jì)算雙向水平地震作用效應(yīng)可能偏于不安全，尤其對(duì)角部豎向構(gòu)件的軸力以及不對(duì)稱(chēng)結(jié)構(gòu)豎向構(gòu)件的剪力計(jì)算偏差較大；對(duì)各種方法差異的原因進(jìn)行了分析，并建議未來(lái)在雙向水平地震作用的相關(guān)性、雙向輸入所用反應(yīng)譜構(gòu)造等方面進(jìn)行研究，進(jìn)一步完善雙向水平地震作用效應(yīng)計(jì)算方法。 

［關(guān)鍵詞］雙向水平地震作用；地震效應(yīng)組合；扭轉(zhuǎn)耦聯(lián)振型分解法；抗震設(shè)計(jì) 

中圖分類(lèi)號(hào)：TU318+.1 文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)17-0010-06

Comparative study of calculation methods for effects under bidirectional horizontal seismic action

WANG  Yayong,  CHEN  Caihua,  CUI  Mingzhe,  XIAO  Chuan,  FENG  Xuguang,  CHEN  Fusheng 

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

Abstract: It is required in the Code for seismic design of buildings (GB 50010—2010) that for structures with unsymmetrical arrangement of mass and stiffness, the calculation of seismic effects should consider the effects of torsional displacement under bidirectional horizontal seismic action, that is, the torsion-coupled mode-superposition method should be adopted to calculate the torsion-coupled seismic effects under bidirectional horizontal seismic action. Several methods of using response spectrum method for the calculation of seismic effects under bidirectional seismic action in international and domestic codes were presented, and a new method based on bidirectional response spectrum input was proposed. The caculation results of the presented methods were compared with that of elastic time history analysis through constructing two simple calculation examples. It was found that the method in the current Code for seismic design of buildings (GB 50011—2010) may be unsafe to calculate the effects of bidirectional horizontal seismic action, especially for axial force in vertical members at the corner, and shear forces in vertical members of unsymmetrical structures, the calculation has a large deviation. Then, the reason of the difference between the combination methods was analyzed. It was suggested that the correlation between bidirectional seismic action and the construction of response spectrum for bidirectional input should be studied in the future, to improve the calculation method for effects under bidirectional horizontal seismic action. 

Keywords:bidirectional horizontal seismic action； seismic effect combination； torsion-coupled mode-superposition method； seismic design

作者簡(jiǎn)介：王亞勇，全國(guó)工程勘察設(shè)計(jì)大師，研究員，Email: yayongwang@sina.com。