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通过对4个传统风格建筑钢结构檐柱在低周往复加载下的试验研究,分析了各檐柱连接区域应变变化情况及其破坏形态,进而研究了各试件在加载全过程的刚度变化规律。分析结果表明:各试件的破坏均为方钢管柱根部屈曲、焊缝开裂及母材拉裂;各试件刚度退化曲线基本对称;轴压比相同时,长细比大的试件其刚度退化速率大;长细比相同时,各试件刚度退化曲线基本平行,其衰减速率基本相等;各试件刚度衰减均表现出由快到慢的规律;得到了层间位移角与刚度退化之间的关系曲线;试件达到极限荷载时,其层间位移角远大于GB 50011—2010《建筑抗震设计规范》规定的限值,表现了良好的变形能力。
Through the experimental research on the four traditional erected steel eave columns under the low-frequency reciprocating loading, the strain changes and the failure modes of the eave columns in the connecting area are analyzed, and the variation of the stiffness of each specimen during the loading process is also studied . The results show that the failure of each specimen is the root buckling of square steel pipe, cracking of welding seam and base metal cracking. The stiffness degradation curves of each specimen are basically symmetrical. When the axial compressive ratio is the same, the stiffness When the slenderness ratio is the same, the stiffness degeneracy curve of each specimen is basically parallel and its attenuation rate is basically equal. The stiffness attenuation of each specimen shows a fast to slow law, and the displacement angle and stiffness of the layer degenerate Between the curve; specimen reaches the ultimate load, the displacement between the layers is far greater than the GB 50011-2010 “Code for seismic design of buildings,” the provisions of the limit, showing a good deformation capacity.