冷弯圆钢管压弯构件滞回特性研究*
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(铁道第三勘察设计院集团有限公司, 天津 300251)
［摘要］基于相关试验数据验证数值分析方法后，利用ABAQUS软件对冷弯圆钢管压弯构件的滞回性能进行参数分析。施加整体和局部初始几何缺陷，考虑冷弯加工方式对构件材料特性的影响，采用S4R单元以局部细化网格尺寸方式建模，依据ECCS加载制度，对直径219mm，厚度分别为6，8，10，12mm，长细比分别为30，60，90，轴压比分别为0.2，0.4，0.6的圆钢管算例进行了常轴力、循环弯矩作用下的有限元分析；对圆钢管的极限承载力、延性系数、能量耗散系数等滞回性能指标进行了分析；探讨了径厚比、长细比和轴压比等参数变化对圆钢管滞回特性的影响。结果表明，随径厚比、长细比和轴压比的增加，圆钢管的极限承载能力和刚度降低，而耗能能力则受不同程度的影响。［关键词］冷弯圆钢管; 压弯; 常轴力; 径厚比; 长细比; 轴压比; 滞回性能中图分类号：TU391 文献标识码：A 文章编号：1002-848X(2015)21-0041-06
Research on the hysteretic behavior of cold-formed steel hollow section membersSong Changjiang, Gao Xiujian(The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251, China)Abstract: Based on the experiments data validated by the numerical simulation method, ABAQUS software was employed to analyze the influence factors for hysteretic behavior of cold-formed steel hollow section (CHS) members under constant compression and cyclic bending forces. General and local initial imperfection as well as special material property of cold-formed steel was considered. The models with local refined mesh size were built with element S4R. According to the ECCS loading law，the finite element analyses of CHS members with diameter of 219mm, thickness of 6,8,10,12mm and slenderness of 30,60,90, axial compression ratio of 0.2, 0.4, 0.6 under the constant axial force and cyclic bending moment were carried out, and the load-carrying capacity，ductility coefficient and energy dissipation coefficient of CHS members were obtained. The influence of parameters such as diameter-to-thickness ratio, slenderness ratio as well as axial compression ratio on the hysteretic behavior of CHS members were also discussed. It shows that with the increase of parameters above the ultimate load-carrying capacity and ductility of CHS members decrease and have different influence on energy dissipation capacity of CHS members.Keywords: cold-formed steel hollow section member; bend; constant axial force; diameter-to-thickness ratio; slenderness ratio; axial compression ratio; hysteretic behavior
*国家自然科学基金面上项目（51278036）。作者简介：宋长江，教授级高级工程师，副总工程师，Eamil:lsqin64@163.com。
