摘要
建立了考虑材料、几何和接触非线性的有限元模型,在对冷弯薄壁型钢四肢拼合截面立柱的轴压性能试验试件进行模拟分析,验证有限元方法正确性的基础上,对考虑长细比、截面翼缘宽厚比等因素的一系列试件进行了数值分析,并得到其轴压承载力。在相关规范"有效宽度法"和"直接强度法"的基础上,提出了冷弯薄壁型钢四肢拼合截面立柱轴压承载力的设计方法:有效计算长度法和修正系数法。研究结果表明:试件最终破坏均呈现局部屈曲和畸变屈曲的破坏模式;在未考虑计算长度系数折减的情况下,当长细比小于50时,各规范公式计算值均略低于试验值和有限元值,吻合较好,当长细比大于50时,公式计算结果过于保守。
The finite element model involving geometric large deformation,materials and contact nonlinearity is established. Specimens of cold-formed steel quadruple-C built up section members are simulated and the finite element models are proved to be valid. Then, numerical analysis on the behavior of specimens with different slenderness ratio and flange flakiness ratio are carried out, and then the axial bearing capacities of specimens are obtained. Based on effective width method and direct strength method （DSM） in related codes, two design methods of cold-formed steel quadruple-C built-up section members under axial compression are proposed, effective length method and correction factor method. It is shown that：the final failure characteristics of all specimens are local buckling and distortional buckling. In the case of not considering the reduction of effective length, the results calculated by each code are slightly lower than those of test and FEM when the slenderness ratio is less than 50,while the results are too conservative when the slenderness ratio is more than 50.
出处
《土木建筑与环境工程》
CSCD
北大核心
2011年第4期20-28,共9页
Journal of Civil,Architectural & Environment Engineering
基金
陕西省自然科学基金项目资助(SJ08E211)
关键词
冷弯薄壁型钢
试验研究
承载力
数值分析
有效宽度法
直接强度法
cold formed steel
experimental analysis
bearing capacity
numerical analysis
effective width method
direct strength method
