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进行了9组共18个冷弯薄壁方钢管受压长柱试件的试验研究,考虑了长细比、偏心距两个变化参数,得到了试件的破坏形态、荷载-位移曲线以及承载力等重要数据,并采用有限元方法进行了数值模拟计算。结果表明:1)对于轴心受压柱,在长细比λ≤36.4时,柱发生强度破坏,承载力较高;对于受压偏心距较大的柱,发生屈曲破坏,且发生局部屈曲后在持荷下迅速丧失承载能力。2)偏心距对受压构件极限承载力影响很大,在长细比λ≥29.1时,极限承载力随偏心距增加而迅速降低;建议在长细比λ≥58.2时,受压柱需加支撑以减小计算长度,提高极限承载力。3)有限元计算结果与试验结果较为接近,差值在12%以内,具有一定准确度。
A total of 18 specimens of 9 specimens with cold-formed square steel tube subjected to cold-formed thin-walled square tubes were tested. Considering the slenderness ratio and eccentricity, two parameters were obtained, such as failure mode, load-displacement curve and bearing capacity Important data, and using the finite element method for numerical simulation. The results show that: 1) When the slenderness ratio is less than or equal to 36.4, the strength of the column is destroyed and the bearing capacity is higher; for columns with larger eccentricity, the buckling damage occurs, and after partial buckling Carrying capacity under the load quickly lost. 2) The eccentricity has a great influence on the ultimate bearing capacity of the compression member. When the slenderness ratio λ≥29.1, the ultimate bearing capacity decreases rapidly with the increase of eccentricity. It is suggested that when the slenderness ratio λ≥58.2, Support to reduce the calculation length, increase the ultimate bearing capacity. 3) Finite element calculation results are close to the test results, the difference is within 12%, with a certain degree of accuracy.