(中国建筑科学研究院有限公司， 北京 100013)

［摘要］我国《建筑抗震设计规范》（GB 50011—2010）中规定，对于质量和刚度分布明显不对称的结构，地震效应的计算应计入双向水平地震作用下的扭转影响，即采用扭转耦联振型分解法计算双向水平地震作用下的扭转耦联地震效应。简要介绍了国内外设计规范中采用反应谱计算双向水平地震作用效应的几种方法，并提出了一种基于双向地震作用的新方法；通过构造两个简单算例，将各种方法的计算结果与弹性时程分析的结果进行对比，指出了现行《建筑抗震设计规范》（GB 50011—2010）方法计算双向水平地震作用效应可能偏于不安全，尤其对角部竖向构件的轴力以及不对称结构竖向构件的剪力计算偏差较大；对各种方法差异的原因进行了分析，并建议未来在双向水平地震作用的相关性、双向输入所用反应谱构造等方面进行研究，进一步完善双向水平地震作用效应计算方法。 

［关键词］双向水平地震作用；地震效应组合；扭转耦联振型分解法；抗震设计 

中图分类号：TU318+.1 文献标识码：A文章编号：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

作者简介：王亚勇，全国工程勘察设计大师，研究员，Email: yayongwang@sina.com。