Based on the energy method, this article presents a theoretical study on the elastic local buckling of steel plates in rectangular concrete-filled steel tubular columns with binding bars subjected to eccentric compression. The formulas for elastic local buckling strength of the steel plates in eccentrically loaded rectangular concrete-filled steel tubular columns with binding bars are derived, assuming that the loaded edges are clamped and the unloaded edges of the steel plate are elastically restrained against rotation. Then, the experimental results are compared with these formulas, which exhibits good agreement. Subsequently, the formulas are used to study the elastic local buckling behavior of steel plates in rectangular concrete-filled steel tubular columns with binding bars under eccentric compression. It is found that the local buckling stress of steel plates in eccentrically loaded rectangular concrete-filled steel tubular columns with binding bars is significantly influenced by the stress gradient coefficient, width-to-thickness ratio, and the longitudinal spacing of binding bars. With the decrease of width–thickness ratios or the longitudinal spacing of binding bars or with the increase of the stress gradient coefficient, the local buckling stress increases. Furthermore, the influence of the longitudinal spacing of binding bar is more significant than the stress gradient coefficients. Finally, appropriate limitation for depth-to-thickness ratios (D/t), width-to-thickness ratios (B/t), and binding bar longitudinal spacing at various stress gradient coefficients (α0) corresponding to different cross-sectional aspect ratios (D/B) are suggested for the design of rectangular concrete-filled steel tubular columns with binding bars under eccentric compression.

中文翻译：

---

带约束钢筋矩形钢管混凝土柱偏心受压局部屈曲

基于能量法，本文对带约束钢筋的矩形钢管混凝土柱在偏心受压下的钢板弹性局部屈曲进行了理论研究。推导出带约束钢筋的偏心矩形钢管混凝土柱中钢板的弹性局部屈曲强度计算公式，假设钢板的加载边被夹紧，钢板的卸载边被弹性约束以防止旋转。然后，将实验结果与这些公式进行比较，显示出良好的一致性。随后，该公式用于研究偏心受压下带约束钢筋的矩形钢管混凝土柱中钢板的弹性局部屈曲行为。研究发现，带约束杆偏心受荷矩形钢管混凝土柱中钢板的局部屈曲应力受应力梯度系数、宽厚比和约束杆纵向间距的影响显着。随着宽厚比或约束杆纵向间距的减小或随着应力梯度系数的增大，局部屈曲应力增大。此外，约束杆纵向间距的影响比应力梯度系数更显着。最后，适当限制深厚比 (D/t)、宽厚比 (B/t)，