钢筋混凝土框架强柱弱梁设计的概率分析
夏 倩
(同济大学建筑工程系,上海200092)
摘要:分析了抗震等级分别为一级、二级和三级,并且设防烈度分别为7、8度时的钢筋混凝土框架
强柱弱梁设计的保证率,结合强柱弱梁设计功能函数中的各个随机变量的统计特征,分别分析了住
宅楼和办公楼在抗震等级为一级、二级和三级时的钢筋混凝土框架强柱弱梁的可靠指标;结合一级
抗震等级、9度设防烈度区的框架结构强柱弱梁的可靠指标取值,得出合理的超筋率取值范围。分
析结果表明:控制超筋率可以使框架结构强柱弱梁设计得到保障;所得结论为进一步分析可靠指标
的最终合理取值范围提供了依据。
关键词:钢筋混凝土框架;强柱弱梁;抗震可靠度;可靠指标;超筋率
中图分类号:TU375.1 文献标志码:A
Probability Analysis of Strong Column—weak Beam
Design of Reinforced Concrete Frames
XIA Qian
(Department of Building Engineering。Tongji University,Shanghai 200092,China)
Abstract: Authors analyzed strong column—weak beam design grarantee rates of reinforced
concrete frames at the seismic rating of 1,2 and 3。fortification intensities were 7,8 degrees
associated with various statisticaI characteristics of random variables in strong column—weak beam
design feature function,eachly analyzed residential and office buildings’reliability index of strong
column—weak beam of reinforced concrete frames in the seismic rating of 1。2 and 3,combined with
a reliability index of strong column—weak beam in the seismic rating of 1,9 degrees fortification
intensity areas,found OUt a reasonable range of super configuration percentage of reinforcement.
Analysis results show that controlling super configuration percentage of reinforcement can ensure
strong column—weak beam design of reinforced concrete frames. The conclusions provide the
bases for further analyzing the reasonable range of the reliability index.
Key words:reinforced concrete frame;strong column—weak beam ;seismic reliability;reliability
index;super configuration percentage of reinforcement
引 口
强柱弱梁设计是保证钢筋混凝土框架结构延性
的重要措施之一,目前大多数设计方法是建立在工
程经验基础上的。部分学者在评价目前设计方法过
程中,发现其在概念上存在明显的不足。本文中笔
者结合概率理论和结构可靠理论,着重从钢筋混凝
土框架强柱弱梁可靠指标的主要影响参数入手进行
分析,为保证钢筋}昆凝土框架结构的延性措施之
一— — 强柱弱梁提供更加可靠的依据,尤其是单独
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