摘要
目前钢筋混凝土(reinforced concrete,RC)框架隔震体系在设计分析过程中均将填充墙作为非结构构件,未充分考虑填充墙不同布置方式对隔震体系和隔震设计的影响规律。以8层RC框架填充墙隔震体系为研究对象,考虑填充墙平、立面不同分布的10种模型,建立RC框架隔震结构非线性分析有限元模型,探讨填充墙对RC框架隔震体系性能及相应隔震设计方法的影响。结果表明:填充墙的不同布置方式对结构前3阶影响较小,对高阶振型影响显著;现有不考虑填充墙影响的纯框架隔震设计方法得到的减震系数偏小,夸大了减震效果,进行上部结构设计会导致其偏于不安全;填充墙竖向不均匀的隔震结构,在未布置填充墙的楼层会发生刚度突变,尤其是靠近隔震层的下部楼层地震反应突变尤为明显,在强震作用下容易发生破坏;填充墙水平不均匀的隔震结构,X或Y向未布置填充墙时变形突变较明显。因此,建议在隔震设计时要充分考虑填充墙的布置,隔震层以上1~3层尽量布置填充墙,避免出现底部薄弱层而对整个隔震体系安全性产生影响。
At present,infilled walls of the isolated reinforced concrete(RC)frame system is treated as a non-structural component in the design and analysis,and the influence of different arrangement of infilled walls have not been fully taken into account on anti-seismic design and response of isolated system.An 8-story isolated RC frame system with infilled walls was taken as the research object.Ten models of different infilling arrangement in horizontal or vertical direction were considered,for which the corresponding nonlinear analysis finite element models were built,the influence of the infilled walls on the anti-seismic behavior of isolated RC frame structure was assessed,and corresponding design method was searched in detail.The results show that,different arrangement of infilled walls had a significant influence on the higher modes,but less on the first three modes;the seismic isolation coefficient calculated by available method without considering the influence of infilled walls was relatively small,indicating that the isolation effect may be overstated and may cause a risk in the safety of the upper structure;along vertical direction of isolated RC-framed buildings with non-uniform infilled wall,there would be stiffness mutation in the lower stories with no infilled walls.Especially,near the isolation layer,the seismic response mutation was obvious,and damage would occur easily under a strong earthquake;and along the horizontal direction of isolated RC-framed buildings with non-uniform infilled wall,torsional modes would occur in higher modes.Therefore,it is necessary to take full account into the influence of infilled walls in the process of the isolation design,floors 1~3 above the seismic isolation layer should be made with infilled walls as much as possible to avoid the appearance of weak floor in the bottom to ensure the safety of the whole isolation system.
作者
赵桂峰
马玉宏
崔秀丽
吴小平
ZHAO Gui-feng;MA Yu-hong;CUI Xiu-li;WU Xiao-ping(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China;Earthquake Engineering Research&Test Center,Key Laboratory of Seismic Control and Structural Safety,Guangzhou University,Guangzhou 510405,China)
出处
《科学技术与工程》
北大核心
2020年第1期279-290,共12页
Science Technology and Engineering
基金
国家自然科学基金(51578170,51678173)
长江学者和创新团队发展计划(IRT13057)
