基于动力方法的RC框架结构整体超强能力分析
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
结构超强系数是结构在强震作用下不发生倒塌的重要因素,但是目前中国现行抗震规范没有纳入结构超强能力的影响,对于结构安全性的计算都是考虑结构构件,没有更多地考虑整体结构的承载能力.考虑不同设防烈度,不同层数严格按现行抗震规范设计了17个典型RC框架结构,采用OpenSees进行有限元建模与分析,并采用结构拟静力试验数据对有限元模型进行验证.采用非线性动力方法对所设计典型结构的地震反应进行了分析,得到了按现行抗震规范所设计结构的整体动力超强系数能力值的取值及其变化规律.结果表明:通过结构整体动力超强系数能力值,可以预测临界倒塌状态时结构的最大承载能力.分别按Ⅵ度,Ⅶ度和Ⅷ度抗震设防设计的结构,结构整体动力超强系数能力值分别至少要达到6,4和3,其最低值和NEHRP2000推荐条文中给出的结构整体超强系数限值3一致.
Structural over-strength is an important factor for structural collapse prevention when the structures suffer major earthquakes,however,it isn't included in our current Chinese seismic design code,and the seismic design specifications for structural safety calculations are based on structural members,with no more consideration on global carrying capacity of the whole structure.17 RC frame buildings with different fortification intensities and storeys were designed according to the current Chinese Codes.These structures were modeled and analyzed in the platform OpenSees.By comparison of the quasi-static test data for RC frame structures with the analytical data correspondingly,the OpenSees models were verified and validated.For these 17 RC frames,structural seismic response was analyzed by nonlinear dynamic procedures(NDP),and the values of the"capacity"of structural overstrength factors and their variation rules with structural storeys and design fortification intensities were analyzed and derived.It is shown that structural ultimate load carrying capacity in collapse prevention performance level can be estimated by structural overstrength factor"capacity".For RC frames designed in seismic fortification intensityⅥ,Ⅶ,Ⅷ,structural global overstrength factors"capacity"are 6,4,3above respectively,and the minimum value agrees with the value 3given in NEHRP recommended provisions.
引文
[1]Federal Emergency Management Agency.Quantificaiton of building seismic performance factors(FEMA-P695)[R].Redwood CA:ATC-63Applied Technology Council,2009.
    [2]Building Seismic Safety Coucil.NEHRP recommended provisions for seismic regulations for new buildings and other structures[S].Washington,D C:FEMA-P750,Building Seismic Safety Council,2009.
    [3]Cormte Europeen de Normalisation.Design provisions for earthquake resistance of structures[S].Bruxelles:European Prestandard ENV,2002.
    [4]Standards New Zealand.General structural design and design loadings for buildings(NZS 4203)[S].Wellington:Standards New Zealand,2002.
    [5]JAIN S K,NAVIN R.Seismic overstrength in reinforced concrete frames[J].Journal of Structural Engineering,ASCE,1995,121(3):580-585.
    [6]MWAFY A M,ELNASHAI A S.Overstrength and force reduction factors of multistorey reinforced-concrete buildings[J].The Structural Design of Tall Buildings,2002,11:329-351.
    [7]CECS 160-2004建筑工程抗震性态设计通则(试用)[S]北京:中国计划出版社,2004:28-29.CECS 160-2004 General principles of performance-based seismic design of buildings(Trial)[S].Beijing:China Planning Press,2004:28-29.(In Chinese)
    [8]周靖,蔡健,方小丹.钢筋混凝土框架结构抗震超强系数分析[J].世界地震工程,2007,23(4):227-233.ZHOU Jing,CAI Jian,FANG Xiao-dan.Seismic overstrength factors for reinforced concrete frames[J].World Earthquake Engineering,2007,23(4):227-233.(In Chinese)
    [9]黄远,易伟建,聂建国.考虑钢梁翼缘断裂的组合框架抗震性能分析[J].湖南大学学报:自然科学版,2012,39(7):1-6.HUANG Yuan,YI Wei-jian,NIE Jian-guo.Seismic performance of steel-concrete composite frames considering the fracture of beam bottom flanges[J].Journal of Hunan University:Natural Sciences,2012,39(7):1-6.(In Chinese)
    [10]GB 50011-2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010:47.GB 50011-2010 Code for Seismic Design of Buidings[S].Beijing:China Architecture&Building Press,2010:47.(In Chinese)
    [11]崔双双.RC框架结构整体抗震性能系数与综合反应修正系数研究[D].哈尔滨:哈尔滨工业大学土木工程学院,2013:46-50.CUI Shuang-shuang.Research on global seismic performance factors and comprehensive response modification factors of RC frame structures[D].Harbin,School of Civil Enginering,Harbin Institute of Technology,2013:46-50.(In Chinese)
    [12]PEER Strong Motion Database[M/OL].http://peer.berkeley.edu/smcat.
    [13]于晓辉,吕大刚.考虑结构不确定性的地震倒塌易损性分析[J].建筑结构学报,2012,33(10):8-14.YU Xiao-hui,LV Da-gang.Seismic collapse fragility analysis considering structural uncertainties[J].Journal of Building Structures,2012,33(10):8-14.(In Chinese)
    [14]李雁军,吕大刚,王震宇,等.钢筋混凝土框架结构拟静力倒塌实验数值模拟[J].工程力学,2012,29(增刊2):205-209.LI Yan-jun,LV Da-gang,WANG Zhen-yu,et al.Numerical simulation for quasi-static collapse test of RC frame[J].Engineering Mechanics,2012,29(S2):205-209.(In Chinese)

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心