(中国建筑科学研究院， 北京100013)

［摘要］推导了理想的弯曲型和剪切型悬臂结构在地震作用下的剪重比理论公式，以此为基础对《建筑抗震设计规范》（GB 50011—2010）第5.2.5条中的剪重比控制方法进行了探讨，指出“规范的剪重比限值与场地特征周期和结构阻尼比无关，从而导致其对某些特征周期较长的结构完全不控制，而对某些特征周期较短的结构则控制过严”的问题。最后提出了通过直接调整长周期段加速度反应谱以完成剪重比控制的改进建议。

［关键词］弯曲型悬臂结构; 剪切型悬臂结构; 剪重比

中图分类号：TU318,TU973.1   文献标识码：A   文章编号：1002-848X(2014)03-0007-06

Study on control method and rules of seismic shear-weight ratio for building structure

Huang Jifeng, Li Dang, Xiao Li

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

Abstract: The theoretical solutions of seismic shear-weight ratio were derived for the flexural and the shearing cantilever structure, based on which the rationality of the provision 5.2.5 in Code for seismic design of buildings(GB 50011-2010) in China was investigated. It was pointed out that the limit value of seismic shear-weight ratio in the code is independent of the characteristic period of ground motion and structural damping ratio, so that the seismic shear-weight ratio for some structures with long site characteristic period is out of control and that for some other structures with short site characteristic period is given excessive strict limitation. At last, by regulating the design spectrum curve in the long period zone, an improved seismic shear-weight ratio control method was presented.

Keywords: flexural cantilever structure; shearing cantilever structure; seismic shear-weight ratio

作者简介：黄吉锋，博士，研究员，Email: huangjifeng@cabrtech.com。

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