楔形H型钢短柱循环荷载试验研究

Experiment on steel short column with tapered H-section under cycling loading

对7个楔形薄腹H型钢短柱进行了在恒定轴力下的拟静力试验,对比分析了其在反复水平荷载作用下的破坏现象、滞回曲线、耗能情况。试验结果分析表明:腹板宽厚比较高的试件延性较差,且板件宽厚比对于构件的影响和初始缺陷密切相关;构件的竖向力对其滞回性能影响较大,应严格控制楔形压弯构件的轴压比。

In steel or composite gable frame construction, steel element with tapered H-seition is often used. The web with high height-thickness ratio is usually applied for tapered H-section members, where local buckling may occur. Seven steel columns with tapered H-section under cyclic loading are examined, in which the local buckling of web plate, hysteretic curves, energy dissipation and failure mode are focused on. Various factors affecting load-carrying capacity and energy dissipation are evaluated. From experimental studies, it is found that the steel members with tapered H-section and high width-thickness ratio web may be less ductile; the hysteretic behavior may be affected by the initial imperfection of the web and the axial force. Some valuable suggestions on using this kind of column for structures in seismic zone were presented.