STUDY OF BUCKLING MODES OF LARGE-GAUGE SINGLE-ANGLE COLUMNS CONSIDERING EFFECT OF SUPPORT CONSTRAINTS
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摘要: 针对大角钢轴压杆失稳形态这一问题,对90根大角钢构件进行轴压试验,并考虑试验中支座的弯曲转动刚度和扭转转动刚度的影响,对大角钢构件绕非对称轴的弯曲长细比和绕对称轴的扭转长细比进行了修正。研究结果表明:大角钢轴压杆的失稳形态以弯曲失稳为主,对于长细比小于40的大角钢轴压杆可不用验算其弯扭屈曲承载力,仅按弱轴弯曲屈曲计算其承载力便可保障设计安全,对工程设计具有指导意义。Abstract: To study the buckling mode of large-gauge single-angle columns,axial compression tests of 90 columns were conducted. Considering the effect of flexural stiffness and torsional stiffness of supports,the column's flexural slenderness ratios of the non-symmetry axis and torsional slenderness of the symmetry axis were corrected. The study showed that the buckling modes of large single-angle columns were in flexural buckling predominantly. And it's unnecessary for columns below 40 in slenderness ratio to calculate the flexural-torsional buckling capacity. It's safe for engineering projects to only consider the flexural buckling capacity of the columns' minor axis.
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