基于离散加筋理论的加筋圆柱壳轴压后屈曲缩尺模型研究

来源:用户上传      作者:李正良 王静超 于伟 朱万旭

　　摘 要：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.
　　关键词：薄壁结构;气柜;离散加筋理论;后屈曲;缩尺模型
　　中图分类号：TU33 文献标志码：A
　　Study on Post-buckling Scalemodel of Stringer Stiffened-cylindrical Shells under Axial Compression Based on Discrete Stiffenedmethod
　　LI Zhengliang1，2，WANG Jingchao1，YU Wei3，4?，ZHU Wanxu3，4（1.School of Civil Engineering，Chongqing University，Chongqing400045，China;
　　2.Key Laboratory of New Technology for Construction of Cities inmountain Area（Chongqing University）of theministry of Education，Chongqing400045，China;
　　3.College of Civil and Architecture Engineering，Guilin University of Technology，Guilin 541004，China;
　　4.Guangxi Key Laboratory of New Energy and Building Energy Saving，Guilin University of Technology，Guilin 541004，China）
　　Abstract：Aiming at the scalemodel 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 si-militude requirements and scaling laws of stiffened shells under axial compression are presented based on the dis-crete stiffenedmethod and the total energy of the structural system.For the ring and stringer stiffened-cylindrical shells with different initial imperfections andmodelingmaterial properties， the partial similitude of the post-buckling behaviors under axial compression ismainly investigated.The results show that： using partial similitude scaling laws for the post-buckling of stiffened cylindrical shells under axial compression， scaledmodels can accurately predict the post-buckling behaviors of prototypes of discretely ring and stringer stiffened-cylindrical shells under axial com-pression.When thematerial Poisson's ratio of themodel and the prototype is the same， themodel can accurately pre-dict the post-buckling behaviors of the prototype under axial compression.As thematerial Poisson’s ratio deviation between themodel and the prototype increases， the deviation of the post-buckling behaviors between the predicted prototype and its corresponding prototype gradually increases.In conclusion， the designmethod of scalemodels 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 andmaterial properties， which provides a reference for the scalemodel design and test of similar structures in practical engineering.

nlc202208241115

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