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本文报导了27根两端弯矩不相等的无侧移钢管砼框架柱的试验结果。试验的主要参数为长细比、偏心率和较小端弯矩与较大端弯矩的比值β(=M_1/M_2)。试验结果表明,除了长细比和偏心率对试件承载能力有显著的影响外,端弯矩比对承载能力也有显著的影响。对于端弯矩不相等的非标准单元柱,其承载能力折减系数随长细比和偏心率而变化的规律与端弯矩相等的标准单元柱相似。文中根据这一规律,采用了一个等效长度系数k=0.5+0.3β+0.2β~2,将非标准单元柱转化为标准单元柱,应用“双系数乘积”公式计算其承载能力。经用本文和文献上的试验结果对建议的方法进行校核,实测值与计算值符合良好。
This paper reports the test results of 27 steel pipe frame frames without sideways bending at two ends. The main parameters of the test are slenderness ratio, eccentricity ratio and ratio of the smaller end bending moment to the larger end bending moment β (=M_1/M_2). The test results show that, in addition to the significant influence of the slenderness ratio and eccentricity on the bearing capacity of the test piece, the end bending moment ratio also has a significant effect on the bearing capacity. For non-standard cell columns with unequal bending moments, the law of variation in the bearing capacity reduction factor with the slenderness ratio and eccentricity is similar to the standard cell column with the same end bending moment. According to this law, an equivalent length coefficient k=0.5+0.3β+0.2β~2 is used to convert the non-standard cell column into a standard cell column, and the bearing capacity is calculated using the “double coefficient product” formula. The proposed method was calibrated using the test results in this paper and literature, and the measured and calculated values were in good agreement.