摘要
基于开口薄壁杆件理论计算公式,研究了等边角钢、工字形、十字形3种截面类型钢柱的轴压稳定性,分析了各种失稳形式的特征及发生条件,得到了各种失稳形式与截面尺寸的关系。在有限元软件ANSYS环境中,基于第一阶特征屈曲模态引入初始缺陷后各类柱截面稳定承载力位于规范中各类柱子曲线的带状区域内。根据理论和数值模拟的结果给出了各类失稳类型与其对应的截面尺寸。柱支撑条件为一端固定一端自由,既可以放大计算长度又保证了实验安全。该教学实验设计可适合在本科教学平台上开展。
Based on theoretical calculation formulas,the axial compression stability of steel columns with three cross-section types:equilateral angle steel,I-shaped and cruciform section is studied.The characteristics and occurrence conditions of various instability forms are analyzed,and the relationship between various instability forms and cross-sectional dimensions is obtained.In the environment of the finite element software ANSYS,the stable bearing capacity of various column sections is located in the banded area of the specifications after initial imperfections are introduced based on the first-order characteristic buckling mode.According to the results of theory and numerical simulation,various types of instability and their corresponding cross-sectional dimensions are given.The supporting condition of the column is that one end is fixed and the other end is free,which can enlarge the calculation length and ensure the safety of the experiment.The teaching experiment design proposed in the article is very suitable for development on the undergraduate teaching platform and can be used as a reference for relevant technical personnel of experiment teaching.
作者
赵卫平
赵欣杰
陈佳麟
吴丽丽
ZHAO Weiping;ZHAO Xinjie;CHEN Jialin;WU Lili(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《实验室研究与探索》
CAS
北大核心
2021年第12期163-167,共5页
Research and Exploration In Laboratory
基金
国家自然科学基金项目(51474218)
中国矿业大学(北京)课程建设项目(J20ZD21,J20ZD22)。
关键词
钢结构
压杆稳定
有限元法
长细比
宽厚比
steel structures
compression bar stability
finite element method
slenderness ratio
width-to-thickness ratio
