超长混凝土框架结构地震反应行波效应研究
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摘要
针对目前结构行波效应研究现状,文中借助建筑结构通用有限元软件M idas/Gen,采用一致与非一致2种激励方式对长度为33~264m的3层钢筋混凝土框架结构进行弹性时程分析。通过对比一致与非一致激励下的柱弯矩,剪力以及轴力,详细讨论其随波速、长度以及不同部位的变化规律。结果表明:柱内力都遵循波速越慢,结构长度越长,行波效应越明显。框架柱弯矩第1层与2、3层差异比较大,增大的柱主要集中在结构第1层两端,1层中部和2,3层的柱均表现为减小;剪力与弯矩有相似的变化规律,只存在量上的差别,正负剪力与弯矩分别最大差异只有4.4%,-4.5%;波速、长度的改变对柱轴力的影响有限,变化幅度不超过2.7%。
The general finite element software Midas/Gen for architectural structure is applied to analyze time-history responses of three-story and 33～264 meter RC framed structures under the actions of uniform and non-uniform excitation.By comparing the data of the bending moments,shear forces and axial forces of frame columns under the actions of uniform and non-uniform excitation,the changes law of the responses with the change of wave velocity structure length and column place are discussed in detail.The results are shown that the slower the seismic wave velocity is,the longer the structure is and the more obvious the travelling wave effect is.There are relatively large differences of column moments between the first story and the second or third story.The increased moments mainly ocurred at both ends of the columns in first story,the moments at the middle of the columns is infirst story and in all second and third stories′ columns showed the decrease.The rule of shear force is similar with bending moment when considering traveling wave effect,the maximum differences between positive and negative shear force and bending moment are only 4.4% and-4.5% respectively.The axial force is weakly influenced by the change of the wave velocity and the length of the frame structure,and the range of change is less than 2.7%.
The general finite element software Midas/Gen for architectural structure is applied to analyze time-history responses of three-story and 33～264 meter RC framed structures under the actions of uniform and non-uniform excitation.By comparing the data of the bending moments,shear forces and axial forces of frame columns under the actions of uniform and non-uniform excitation,the changes law of the responses with the change of wave velocity structure length and column place are discussed in detail.The results are shown that the slower the seismic wave velocity is,the longer the structure is and the more obvious the travelling wave effect is.There are relatively large differences of column moments between the first story and the second or third story.The increased moments mainly ocurred at both ends of the columns in first story,the moments at the middle of the columns is infirst story and in all second and third stories′ columns showed the decrease.The rule of shear force is similar with bending moment when considering traveling wave effect,the maximum differences between positive and negative shear force and bending moment are only 4.4% and-4.5% respectively.The axial force is weakly influenced by the change of the wave velocity and the length of the frame structure,and the range of change is less than 2.7%.
引文
[1]葛军.钢筋混凝土超长结构地震行为行波效应研究[D].成都:四川大学,2004.GE Jun.Research on seismic responses of RC superlong structure considering traveling wave effect[D].Chengdu:Sichuan University,2004.
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[5]楼梦麟,黄明开.上海浦东机场(二期)候机楼水平地震行波效应时程分析[J].建筑结构,2009,29(2):8-11LOUMenglin,HUANG Mingkai.Timehistory analysis of effect of horizontal seismic travelingwave of Shanghai Pudong airport terminalⅡ[J].Building Structure,2009,29(2):8-11.
[6]杨庆山,刘文华,田玉基.国家体育场在多点激励作用下的地震反应分析[J].土木工程学报,2008,41(2):35-41.YANG Qingshan,LIUWenhua,TIAN Yuji.Response analysis of nationai stadium under specially variable eathquake ground motions[J].ChinaCivil Engineering Journal,2008,41(2):35-41.
[7]GB50011-2001建筑抗震设计规范[S].GB50011-2001 Code for Seismic Design of Buildings[S].
[2]陈兴冲,吴海燕,张永亮.行波效应对铁路大跨长联连续刚构桥地震反应的影响[J].世界地震工程,2010,26(1):191-196.CHEN Xingchong,WUHaiyan,ZHANG Yongliang.The effect of traveling waves on seismic response of railwaylong-span and long-conjunctioncontinuous rigidframe bridges under multi-support excitations[J].World Earthquake Engineering,2010,26(1):191-196.
[3]周国良,鲍叶欣,李小军,等.结构动力分析中多点激励问题的研究综述[J].世界地震工程,2009,25(4):25-32.ZHOUGuoling,BAO Yexin,LI Xiaojun,et al.Review on dynamic analyses of structures under multi-support excitation[J].World EarthquakeEngineering,2009,25(4):25-32.
[4]刘枫,肖从真.首都机场3号航站楼多维多点输入时程地震反应分析[J].建筑结构学报,2006,27(5):56-63.LIU Feng,XIAO Congzhen.Timehistory analysis of terminal 3 of the Capital Airport under multisupport and multidimension seismic excitation[J].Journal of Building Structures,2006,27(5):56-63.
[5]楼梦麟,黄明开.上海浦东机场(二期)候机楼水平地震行波效应时程分析[J].建筑结构,2009,29(2):8-11LOUMenglin,HUANG Mingkai.Timehistory analysis of effect of horizontal seismic travelingwave of Shanghai Pudong airport terminalⅡ[J].Building Structure,2009,29(2):8-11.
[6]杨庆山,刘文华,田玉基.国家体育场在多点激励作用下的地震反应分析[J].土木工程学报,2008,41(2):35-41.YANG Qingshan,LIUWenhua,TIAN Yuji.Response analysis of nationai stadium under specially variable eathquake ground motions[J].ChinaCivil Engineering Journal,2008,41(2):35-41.
[7]GB50011-2001建筑抗震设计规范[S].GB50011-2001 Code for Seismic Design of Buildings[S].
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