Strength Estimation of Slender SRC Beam-Columns

在日本建筑学会（AIJ）的钢-混凝土组合柱设计公式中，考虑了附加弯矩（P δ弯矩）的影响，采用了柱截面强度叠加的修正方法。我们已经提出了一个公式，用于评估细长混凝土柱的强度，并使用此，我们表明，钢管混凝土（CFT）柱和RC柱的强度是很好的预测。在本研究中，对于型钢混凝土柱的强度，端部弯矩-轴力相互作用关系的计算假定梁-柱的弯曲形状为正弦曲线。除此之外，还进行了柱两端偏心受压试验。选取屈曲长深比、偏心距大小作为试验参数.在试验和理论分析的基础上，对型钢混凝土细长柱最大承载力计算的叠加法进行了研究，并提出了相应的计算方法。

In AIJ (Architectural Institute of Japan) design formula for slender steel- concrete composite columns, the modified method of the superposed strength of a column section is adopted with the consideration on the effect of additional bending moment (Pdelta moment). We have already proposed an equation for evaluating the strength of slender concrete columns, and using this, we showed that the strengths of concrete filled steel tubular (CFT) columns and RC columns are well predicted. In this research, with respect to the strength of SRC columns, the end moment -axial force interaction relations are calculated assuming a sine curve deflected shape of the beam-column. In addition to the analytical work, experiment of eccentric compressive load at both end of a column was performed. As the experimental parameters, buckling length- section depth ratio, magnitude of eccentricity are selected. On the basis of the experimental and analytical results, the superposed method for evaluating the maximum strength of slender SRC columns is examined, and proposed.