框架结构的基于位移概率统计的可靠性分析
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摘要
基于结构位移概率与统计的分析方法,对框架结构在遭遇可能的地震动作用下的可靠性进行了分析研究。选取层间位移角作为钢筋混凝土框架结构抗震性能评估的整体指标。通过统计分析钢筋混凝土框架结构在不同地震动作用下的层间最大弹塑性位移角,得出结构层间最大弹塑性位移角的分布类型,建立结构可靠度的近似分析方法;计算出结构的可靠度。在选取多个地震动对一RC框架结构进行弹塑性时程分析后,计算得到结构的整体可靠度,显示该结构是基本安全的。计算结果表明,结构层间最大弹塑性位移角呈正态分布类型,继而得出了结构整体可靠度的近似评估方法,且能大致确定结构薄弱层所处的位置。
Based on the analysis method of probability and statistics of displacement,the reliability of frame structures under potential ground motions is discussed.Inter-story drift ratio is selected as the integral quantization indexe of evaluating seismic performance of reinforced concrete frame structures.Maximum inelastic inter-story drift ratios of reinforced concrete frame structures under many ground motions are counted and analyzed to calculate the probability distribution type of maximum inelastic inter-story drift ratios,then the approximate analysis method of evaluating the reliability can be established,and the reliability of structures can be worked out.Inelastic time-history analysis of a reinforced concrete frame structure under several ground motions is carried out,and it shows that the structure is safe on the whole after calculating the overall reliability.Furthermore,the conclusions indicate that the probability distribution type of inter-story drift ratios is normal distribution,then the approximate analysis method of evaluating the reliability is established,and the approximate location of weak layers of the structures can be roughly determined.
Based on the analysis method of probability and statistics of displacement,the reliability of frame structures under potential ground motions is discussed.Inter-story drift ratio is selected as the integral quantization indexe of evaluating seismic performance of reinforced concrete frame structures.Maximum inelastic inter-story drift ratios of reinforced concrete frame structures under many ground motions are counted and analyzed to calculate the probability distribution type of maximum inelastic inter-story drift ratios,then the approximate analysis method of evaluating the reliability can be established,and the reliability of structures can be worked out.Inelastic time-history analysis of a reinforced concrete frame structure under several ground motions is carried out,and it shows that the structure is safe on the whole after calculating the overall reliability.Furthermore,the conclusions indicate that the probability distribution type of inter-story drift ratios is normal distribution,then the approximate analysis method of evaluating the reliability is established,and the approximate location of weak layers of the structures can be roughly determined.
引文
1季静,陈学伟,何慧贤.基于概率与位移的框支剪力墙结构抗震性能评估方法.地震工程与工程振动,2009;29(6):108—114
2 Structural engineers associations of California.SEAOC Version 2000.Performance based seismic engineering of buildings.Vols.ⅠandⅡ:Conceptual Franework.Sacramento(CA),1995
3史庆轩,门进杰,杨坤.钢筋混凝土框架结构基于性能的抗震设计指标.四川建筑科学研究,2007;33:78—81
4高晓旺,沈聚敏.“大震”作用下钢筋混凝土框架房屋变形能力的抗震可靠度分析.土木工程学报,1993;26(3):3—12
5黄越,刘洪兵,刘江.框架结构抗震性能评估的可靠性分析.工程抗震与加固改造,2010;32(3):55—58
6 GB 50011—2010,建筑抗震设计规范.北京:中国建筑工业出版社,2010
2 Structural engineers associations of California.SEAOC Version 2000.Performance based seismic engineering of buildings.Vols.ⅠandⅡ:Conceptual Franework.Sacramento(CA),1995
3史庆轩,门进杰,杨坤.钢筋混凝土框架结构基于性能的抗震设计指标.四川建筑科学研究,2007;33:78—81
4高晓旺,沈聚敏.“大震”作用下钢筋混凝土框架房屋变形能力的抗震可靠度分析.土木工程学报,1993;26(3):3—12
5黄越,刘洪兵,刘江.框架结构抗震性能评估的可靠性分析.工程抗震与加固改造,2010;32(3):55—58
6 GB 50011—2010,建筑抗震设计规范.北京:中国建筑工业出版社,2010
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