约束钢柱抗火性能试验研究

Experimental study on restrained steel column subjected to fire

介绍了一组约束钢柱抗火试验,包括试验设计、钢柱温度和位移测量结果、钢柱试验后残余变形,以及试验的数值模拟等。试验变化参数为钢柱所受约束的刚度。约束刚度大小对钢柱抗火性能的影响包括:约束刚度比大的钢柱,其屈曲温度和破坏温度均较低;钢柱屈曲后,约束刚度比大的钢柱在变形较小时即可达到新的平衡位置;约束钢柱的破坏温度一般高于其屈曲温度,且随轴向约束刚度比的增大,破坏温度与屈曲温度之差增大。试验结果与有限元分析结果进行了对比,两者吻合较好,有限元方法研究约束钢柱抗火性能具有较高的精度。

An experimental study was carried out to investigate the axial restraint effect on behaviors of steel columns subjected to fire. Varying the cross-section size of the restraint beam, the required restraint stiffness was obtained in the test. Some observations were： the greater the axial restraint stiffness, the lower the buckling temperature and the failure temperature; the greater the axial restraint stiffness, the smaller displacement after the column＇s buckling; the failure temperature of a restrained column is usually higher than the buckling temperature. A comparison between numerical analysis and testing results show good agreement, so numerical analyses have sufficient accuracy to predict the fire resistance of restrained steel columns.