方钢管-钢骨混凝土偏压柱正截面承载力分析

Cross-section Bearing Capacity Analysis of Eccentrically-loaded Columns of Square Steel Tube Filled with Steel-reinforced Concrete

为了进一步研究方钢管-钢骨混凝土偏心受压柱的力学性能,采用叠加法推导了其在钢管、钢骨受拉、受压区屈服条件下的承载力计算公式;分析了长细比、偏心率、套箍率、配骨率等参数对偏压构件承载力的影响;通过算例对偏压柱正截面承载力的计算过程进行了演示。结果表明:偏心率的增大使承载力迅速降低;随着长细比的增加,构件的承载力呈直线下降;套箍率、配骨率的增加可以显著提高构件的承载力;得出的偏压承载力的计算公式可用于承载力复核,为方钢管-钢骨混凝土偏压柱设计提供参考。

In order to further study the mechanical properties of eccentrically-loaded column of square steel tube filled with steel-reinforced concrete, authors used superposition method to deduce the calculation formula of cross-section bearing capacity under yield conditions of both compressional and tensile regions of steel tube and steel-reinforced. The influences of slenderness ratio, eccentricity ratio, stirrup ratio, steel-reinforced ratio on bearing capacity of eccentrically- loaded columns were also analyzed. Examples about computation process were given[ Results indicate that the increase of eccentricity ratio makes its bearing capacity dropped rapidly; bearing capacity drops linearly with the increase of slenderness ratio and increases rapidly with the increase of the stirrup and reinforced ratio ; the calculation formula proposed above can be used for certifying the bearing capacity, and it can offer reference for design of eccentrically-loaded columns Of square steel tube filled with steel-reinforced concrete.