剪重比的本质关系推导及其对长周期超高层建筑的影响
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廖耘，容柏生，李盛勇（广州容柏生建筑结构设计事务所， 广州 510170）［摘要］通过对剪重比计算公式的化简，得出其与结构各周期地震影响系数及振型参与质量系数的本质关系。以此为基础，就质量和刚度变化对长周期超高层建筑剪重比的影响进行有关论证，得出主要结论有：振型参与质量系数对计算剪重比的影响，是有可能大于刚度和质量对计算剪重比影响的；结构计算剪重比偏小，并不简单意味着结构刚度偏小或质量偏大。［关键词］剪重比； 长周期； 超高层建筑； 振型参与质量系数中图分类号：TU973 文献标识码：A 文章编号：1002-848X(2013)05-0001-04Derivation of shear-gravity ratio and its effect on long-period super high-rise buildingsLiao Yun, Rong Baisheng, Li Shengyong(RBS Architecture Engineering Design Associates, Guangzhou 510170, China)Abstract: The formula of shear-gravity ratio was simplified, and its natural relationship with seismic influence coefficient and mode participation mass ratio was found out. Base on this, the effect on sheargravity ratio which caused by change of mass and stiffness was analyzed, and some conclusions were given. The effect on shear-gravity ratio which caused by mode participation mass ratio was larger than the effect which caused by change of mass and stiffness. Smaller shear-gravity ratio does not mean smaller stiffness or larger mass directly.Keywords: shear-gravity ratio; long period; super high-rise building; mode participation mass ratio作者简介：廖耘，硕士，高级工程师，一级注册结构工程师，Email：liaoyun @gzrbs.com。参考文献［1］GB 50011—2010建筑抗震设计规范［S］. 北京：中国建筑工业出版社，2010.［2］孙广俊，李爱群. 关于结构振型参与系数和振型贡献的分析［J］. 防震减灾工程学报， 2009，29（5）：485-490.
