豎向地震動對帶縫RC框架抗震性能影響的數值研究*
于婧1，李英民2, 3，劉小軍1
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(1 西安建筑科技大學土木工程學院，西安 710055； 2 重慶大學土木工程學院，重慶 400045；3 山地城鎮(zhèn)建設與新技術教育部重點實驗室（重慶大學）， 重慶 400045)
［摘要］為研究豎向地震動對帶施工縫RC框架結構抗震性能的影響，對7～9度區(qū)分別設計了4層規(guī)則框架結構，并對各框架結構建立考慮施工縫影響的數值模型，進行只輸入水平地震波與同時輸入水平和豎向地震波的非線性動力時程分析。對結構的頂點最大位移、層間位移角平均值以及塑性鉸分布規(guī)律進行了對比，結果表明，豎向地震動對各烈度區(qū)帶縫RC框架頂點最大水平位移的影響規(guī)律并不一致，可能使其增大或減小，主要取決于柱軸壓比的變化規(guī)律?？紤]豎向地震動影響會使各烈度區(qū)帶縫框架的層間位移角增大，其中7度區(qū)框架的最大層間位移角超出了規(guī)范限值，9度區(qū)框架的層間位移角分布發(fā)生變化。豎向地震動會使構件端部提前出現(xiàn)塑性鉸，并且柱端更容易出現(xiàn)塑性鉸，梁端出鉸較少。［關鍵詞］施工縫; 豎向地震動; 框架結構; 抗震性能; 數值研究中圖分類號：TU375 文獻標識碼：A 文章編號：1002-848X(2016)03-0032-07
Numerical study on the influence of vertical ground motion on seismic behavior of RC frame with construction jointYu Jing1, Li Yingmin2, 3, Liu Xiaojun1(1 College of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China; 2 Department of Civil Engineering, Chongqing University, Chongqing 400045, China; 3 Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing 400045, China)Abstract:In order to study the influence of vertical ground motion on seismic behavior of reinforced concrete (RC) frame with construction joint, a serious of 4-story regular frames on 7～9 intensity seismic areas were designed. And the nonlinear dynamic time-history analysis under horizontal ground motion or both horizontal and vertical ground motions were performed to frames with construction joint. The maximum vertex displacement, the average interlayer displacement angle and the law of plastic hinge distribution of structure were compared. The results show that the influence law of vertical ground motion for the vertex maximum horizontal displacement of RC frame with construction joint is not consistent, which may increase or decrease the vertex maximum horizontal displacement of structure due to the law of columns axial compression ratio. Vertical ground motion increases the maximum interlayer displacement angle of structure. The values exceed the standard limits on 7 intensity seismic area and the distribution law changed on 9 intensity seismic area. Plastic hinges of rod ends appeared in advance and incline to appear in the end columns, beam ends appears less.Keywords:construction joint; vertical ground motion; frame structure; seismic behavior; numerical study
*國家自然科學基金項目（51208407），西安建筑科技大學人才科技基金(RC1233)。作者簡介：于婧，博士，講師，Email: yujing1506@163.com。
