摘要
针对新型干式煤气柜柜体(大型薄壁纵环离散加筋圆柱壳)轴压后屈曲的缩尺模型设计和相似预报问题,基于离散加筋理论与结构体系的总能量推导出结构轴压后屈曲的广义相似条件和缩尺原理公式.对含不同初始缺陷类型和模型材料的纵环加筋圆柱壳,开展轴压后屈曲不完全相似模拟研究.研究表明:纵环加筋圆柱壳缩尺模型的轴压后屈曲特性,结合结构轴压后屈曲不完全相似的相应缩尺原理公式,能较好地预测其原型结构轴压后屈曲的结果.当模型与原型的材料泊松比相同时,模型能准确预测其原型的轴压后屈曲特性.随着模型与原型的材料泊松比偏差增大,预测原型的后屈曲特性与其原型结果的偏差逐渐增大.提出的缩尺模型设计方法和缩尺原理公式,适用于不同初始缺陷类型和模型材料的纵环加筋圆柱壳轴压后屈曲相似预报,为实际工程中类似结构轴压后屈曲缩尺模型设计和试验提供参考.
Aiming at the scale model design and similarity prediction of the buckling of the new typical gas holder’s body(large thin-walled ring and stringer stiffened-cylindrical shell)under axial compression,general similitude requirements and scaling laws of stiffened shells under axial compression are presented based on the dis⁃crete stiffened method and the total energy of the structural system.For the ring and stringer stiffened-cylindrical shells with different initial imperfections and modeling material properties,the partial similitude of the post-buckling behaviors under axial compression is mainly investigated.The results show that:using partial similitude scaling laws for the post-buckling of stiffened cylindrical shells under axial compression,scaled models can accurately predict the post-buckling behaviors of prototypes of discretely ring and stringer stiffened-cylindrical shells under axial com⁃pression.When the material Poisson′s ratio of the model and the prototype is the same,the model can accurately pre⁃dict the post-buckling behaviors of the prototype under axial compression.As the material Poisson’s ratio deviation between the model and the prototype increases,the deviation of the post-buckling behaviors between the predicted prototype and its corresponding prototype gradually increases.In conclusion,the design method of scale models and scale laws are suitable for the similarity prediction of the post-buckling behaviors of discretely ring and stringer stiffened-cylindrical shells with different initial imperfections and material properties,which provides a reference for the scale model design and test of similar structures in practical engineering.
作者
李正良
王静超
于伟
朱万旭
LI Zhengliang;WANG Jingchao;YU Wei;ZHU Wanxu(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area(Chongqing University)of the Ministry of Education,Chongqing 400045,China;College of Civil and Architecture Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology,Guilin 541004,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第3期123-132,共10页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51868013)
广西自然科学基金资助项目(2018GXNSFBA138056)
广西科技重大专项资助项目(桂科AA18118008)
桂林理工大学博士科研启动基金(GUTQDJJ2017034)。
关键词
薄壁结构
气柜
离散加筋理论
后屈曲
缩尺模型
thin-walled structures
gas holder
the discrete stiffened method
post-buckling
scaled model
作者简介
李正良(1963-),男,江苏江阴人,重庆大学教授,博士生导师;通信联系人:于伟,E-mail:yuwei3601@163.com。
