刘 洁1,王正中2
偏心压力下带肋矩形钢管混凝土短柱局部屈曲分析
刘 洁1,王正中2
摘 要:基于对偏心压力下带肋矩形钢管混凝土短柱管壁的屈曲性能分析,采用能量法推导了矩形长边及短边钢管管壁局部屈曲临界应力,并讨论了应力梯度系数及矩形截面长宽比等参数对屈曲应力的影响。结果表明:当柱截面及材料给定的情况下,应力梯度系数φ越小(即偏心距越大),长边管壁屈曲系数越大,局部稳定性能越好;当钢管厚度及加劲肋一定的情况下,长边管壁与短边管壁临界应力之比与截面长宽比及应力梯度系数有关,设计时应尽可能使长短边管壁临界应力接近,且应不小于钢材屈服强度fy。
Abstract: Based on theoretically investigate of buckling behaviour of short concrete-filled rectangular stiffened steel tubular columns under eccentric loading, the critical stress of the local buckling of the stiffened steel tubes in width and length is derived by energy approach, and the influence of the stress gradient coefficient φ, length-to-width ratios of rectangular steel tubes on the critical stress is analyzed. The results show that local buckling coefficient of the stiffened steel plates of rectangular rises insignificantly with the decrease of the stress gradient coefficient if the area of the across-section and material of columns are a constant. In addition,the eccentricity force is advantageous to the local buckling of the columns. The local critical buckling stress ratios in length to width of the stiffened rectangular steel tubes due to the stress gradient coefficient φ and length-to-width ratios of rectangular steel tube, local critical buckling will happen firstly in length of steel tube or width of ones. It’s suggested that local critical buckling stress in length and width would keep similarly and not exceed yield load fy when designing the columns.
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