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建筑科学与工程学报
JOURNAL OF ARCHITECTURE AND CIVIL ENGINEERING
2006 Vol.23 No.2 P.46-51

数字化期刊

混凝土框架结构抗震设计的弯矩增大系数

易伟建  张颖 

摘 要:基于结构的不同功能失效时对应的损失值不同这一基本事实,利用分枝限界法找出了框架结构在地震作用和竖向荷载共同作用下的主要失效模式和代表机构,通过引入基于失效概率的结构优化模型和结构失效损失期望值,并结合一个框架算例,对现行抗震设计规范的"强柱弱梁"弯矩增大系数的取值进行校核,优化分析得到了柱端弯矩增大系数的合理取值.计算结果表明,梁式失效机构的可靠指标为1.8,柱式失效机构的可靠指标为2.6,说明按照现行抗震设计规范设计的混凝土框架结构,可以满足"强柱弱梁"的要求.
关键词:框架结构;失效模式;失效概率;结构优化;弯矩增大系数
分类号:TU375.4 文献标识码:A

文章编号:1673-2049(2006)02-0046-06

Moment Magnification Factor in Anti-seismic Design of Concrete Frame Structure

YI Wei-jian  ZHANG Ying 

基金项目:国家自然科学基金项目(50378034);教育部高等学校博士学科点专项科研基金项目(20030532020)
作者简介:易伟建(1954-),男,湖南长沙人,教授,博士生导师,工学博士,E-mail:hunuyi@public.cs.hn.cn.
作者单位:易伟建(湖南大学,土木工程学院,湖南,长沙,410082) 
     张颖(湖南大学,土木工程学院,湖南,长沙,410082) 

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收稿日期:2006年2月11日

出版日期:2006年6月30日

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