超长混凝土框架弹性侧移地震行波效应研究
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摘要
针对目前超长混凝土框架结构行波效应缺乏系统研究的现状,选取三条典型地震波记录,借助建筑结构通用有限元软件Midas/Gen,采用一致与非一致两种激励方式,对长度为33～264 m的三层钢筋混凝土框架结构进行弹性时程分析。对比一致与非一致激励下的侧移情况,详细讨论其随波速、结构长度以及不同部位的变化规律。结果表明:行波效应对侧移的增大作用主要在结构一层,尤其是端部,对二、三层侧移的减小作用较大;结构越长,侧移的行波效应越明显;地震波波速越大,侧移的行波效应越不明显。
As researches on traveling wave effect on overlong concrete structures are lacking,with three seismic waves,the general-used finite element software Midas/Gen for architectural structure and the methods of uniform excitation and non-uniform excitation are applied to analyze time-history responses of three-storey reinforced concrete structures with 33~264-meter in length.Based on the contrast between the sidesway values in uniform excitation and those in non-uniform excitation,the relationships between sidesway and wave velocity,sidesway and structure length,sidesway and position are discussed in details.The results show that: the traveling wave effect on sidesway is mainly on the first floor,especially at the tips;the longer the structure is,the more prominent the traveling wave effect will be;the greater the wave velocity is,the more prominent the traveling wave effect will be.
As researches on traveling wave effect on overlong concrete structures are lacking,with three seismic waves,the general-used finite element software Midas/Gen for architectural structure and the methods of uniform excitation and non-uniform excitation are applied to analyze time-history responses of three-storey reinforced concrete structures with 33~264-meter in length.Based on the contrast between the sidesway values in uniform excitation and those in non-uniform excitation,the relationships between sidesway and wave velocity,sidesway and structure length,sidesway and position are discussed in details.The results show that: the traveling wave effect on sidesway is mainly on the first floor,especially at the tips;the longer the structure is,the more prominent the traveling wave effect will be;the greater the wave velocity is,the more prominent the traveling wave effect will be.
引文
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[5]何庆祥,沈祖炎.结构地震行波效应分析综述[J].地震工程与工程振动,2009,29(1):50-57.
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