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为分析有无肋、偏心距e、再生块体混合比η、长细比λ对薄壁方钢管再生块体组合柱偏压承载力的影响,对12根薄壁方钢管再生块体组合柱做偏压承载力试验,采用拟水平法分析各因素的影响程度。研究表明:长细比λ、偏心距e和混合比η综合效应对承载力影响高度显著,加劲肋对承载力影响显著;长细比λ由18.4增加到30.3,偏压承载力降低约450k N;偏心距e由25mm增加到50mm,有肋试件、无肋试件偏压承载力分别降低27.5,105k N;偏心距e为50mm、混合比η为35%时,长细比λ为18.4,30.3的试件加肋后承载力提高程度分别为21.38%,80%。对试验数据做线性回归分析,得出薄壁方钢管混凝土柱偏压承载力计算公式,计算精度较好。
In order to analyze the influence of ribs and eccentricity e, mixing ratio η and slenderness ratio λ on the bearing capacity of thin-walled square steel tube recycled block composite column, 12 thin-walled square steel tube Force test, using the proposed level of analysis of the impact of various factors. The results show that the effect of slenderness ratio λ, eccentricity e and mixture ratio η is highly significant on the bearing capacity, and the stiffener has a significant effect on the bearing capacity; the slenderness ratio λ increases from 18.4 to 30.3 and the bearing capacity of the bias decreases about 450kN ; Eccentricity e increased from 25mm to 50mm, the ribbed specimen, the bearing capacity of the rib-free specimen decreased by 27.5,105k N; the eccentricity e was 50mm, the mixing ratio η was 35%, the slenderness ratio λ was 18.4 , The increase of bearing capacity of 30.3 specimens after ribbing is 21.38% and 80% respectively. By linear regression analysis of the test data, the formula for calculating the bearing capacity of thin-walled square concrete filled steel tubular columns is derived, and the calculation accuracy is better.