第52卷第6期2018年6月浙 江 大 学 学 报(工学版)Journal of Zhe j ian g Universit y (En g ineerin g Science )Vol.52No.6Jun.2018收稿日期:20170223.网址:www.z j u j https://www.doczj.com/doc/f76363503.html, /en g /fileu p /HTML /201806012.htm 基金项目:国家自然科学基金重点资助项目(51438002),国家自然科学基金资助项目(51568041)
,中国博士后科学基金资助项目(2015M571641).作者简介:方钊(1989 ),男,博士生,从事高层钢结构疲劳破坏研究.orcid.or g /0000-0001-7588-139X.E -mail :p hoenix.fan g @https://www.doczj.com/doc/f76363503.html, 通信联系人:李爱群,男,教授.orcid.or g /0000-0002-5049-4315.E -mail :ai q unli@https://www.doczj.com/doc/f76363503.html, DOI :10.3785/j .
issn.1008-973X.2018.06.012钢结构风致疲劳分析的多尺度有限元验证分析
方钊1,李爱群1,
2,李万润1,3,沈圣1(1.东南大学土木工程学院,
江苏南京210096;2.北京建筑大学北京未来城市设计高精尖创新中心,北京100044;3.兰州理工大学防震减灾研究所,甘肃兰州730050)摘 要:为了研究钢结构风致疲劳分析中的多尺度有限元建模技术并验证其合理性,选择某二层框架结构,分别采
用约束方程法和子模型法建立多尺度有限元模型,进行风荷载静力分析二动力时程分析及风致疲劳分析,并将计算
结果与单一尺度模型进行比较,研究各多尺度有限元模型的特点,在此基础上研究局部细观尺度模型区域大小的
选择.结果表明:在静力分析二动力时程分析及疲劳分析中,多尺度模型的计算结果与单一尺度模型吻合较好,精度
可满足工程需要;子模型法相对约束方程法的精度更高,但更易受局部模型区域大小的影响.针对与本工程梁柱尺
寸相似的钢框架结构,建议当采用约束方程法时,边界离研究部位横向轴线的距离选为0.05m ,而当采用子模型法时选为0.10m.关键词:多尺度有限元建模;约束方程法;子模型法;风致疲劳
中图分类号:TU 973 文献标志码:A 文章编号:1008973X (2018)06113109
Verification on multi -scale finite element of wind -induced fati g ue of steel structures
FANG Zhao 1,LI Ai -q un 1,2,LI Wan
-run 1,3,SHEN Shen g 1(1.School o f Civil En g ineerin g ,Southeast Universit y ,Nan j in g 210096,China ;2.Bei j in g Advanced Innovation Center f or Future Urban Desi g n ,Bei j in g Universit y o f Civil En g ineerin g and Architecture ,Bei j in g 100044,China ;3.Institution o f Earth q uake Protection and Disaster Miti g ation ,Lanzhou Universit y o f T echnolo gy ,Lanzhou 730050,China )Abstract :A two -la y er frame structure was selected ,and multi -scale finite element models were established b y the constraint e q uation method and the sub -model method res p ectivel y ,in order to stud y the multi -scale finite element modelin g technolo gy of steel structures under wind and to verif y its rationalit y .Wind load static anal y sis ,d y namic time histor y anal y sis and wind -induced fati g ue anal y sis were p erformed ;the obtained results were com p ared with those of sin g le -scale models ;the characteristics of those multi -scale finite element model were studied.Based on these ,the selection of local micro scale model size was studied.Results show that in static anal y sis ,d y namic time histor y anal y sis and fati g ue anal y sis ,the results of multi -scale models are in g ood a g reement with those of sin g le -scale models and the accurac y can meet the en g ineerin g demand.The sub -model method is more accurate than the constraint e q uation method ,but is more sensitive to the local model size.For those steel frame structures with similar beam and column size to this structure ,the distance between the boundar y and the horizontal axis of the research location is recommended to be 0.05m when the constraint e q uation method is used ,while to be 0.1m