摘要
针对轴力和弯矩共同作用下的约束钢柱受火性能进行了分析.结果包括各参数对约束钢柱轴力—温度关系曲线,跨中弯矩—温度关系曲线,约束钢柱破坏温度,无约束钢柱与约束钢柱破坏温度之差,以及约束钢柱破坏温度与屈曲温度之差等的影响.主要结论为:约束钢柱屈曲前,轴力基本线性增加,截面弯矩变化较小,约束钢柱屈曲后,截面弯矩突然增大;轴向约束减小钢柱的破坏温度,并随约束刚度的增加,钢柱的破坏温度逐渐减小,但是存在临界轴向约束刚度比,当大于该临界约束刚度比时,轴向约束刚度比的大小对钢柱的屈曲温度影响很小;随着轴向荷载比和弯矩荷载比的增加,约束钢柱的破坏温度减小;端部弯矩比对约束钢柱的破坏温度影响较小.
This paper investigates behaviors of the restrained column under combined axial force and bending moment in fire using a calibrated finite element method model. Presented results include the column axial force-temperature evolution curve, the column bending moment-temperature evolution curve, the failure temperature of restrained column, the difference between failure temperature of unrestrained- and restrained-column, and the difference between failure- and buckling-temperature of restrained column. Results of parametric study show that., before the column buckles, the axial force in column increases linearly and bending moment changes a little;after the column buckles, the column is loaded under combined axial force and bending moment; the axial restraint reduces failure temperature of restrained column; and the reduction in failure temperature increases with increasing in axial restraint stiffness. However, there is a critical axial restraint stiffness ratio, above which no further reduction in column failure temperature occurs;with the increasing of axial load ratio and bending moment load ratio, the failure temperature of restrained column decreases; the end moment ratio has very limited effects on failure temperature of the restrained column.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第2期151-157,共7页
Journal of Tongji University:Natural Science
基金
国家自然科学基金重点资助项目(50738005)
国家自然科学基金委创新研究群体资助项目(50621062)
土木工程防灾国家重点试验室开放课题基金资助项目(SLDRCE-08-TS-02)
关键词
约束钢柱
屈曲温度
破坏温度
参数分析
数值模拟
restrained column
buckling temperature
failuretemperature
parametric analysis
numerical simulation
