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在钢板中部位置设置具有约束钢板外凸变形作用的水平拉杆,是改善异形钢管混凝土柱力学性能的有效方法。该文介绍了8个带约束拉杆L形钢管混凝土偏压短柱试件的试验,结果表明约束拉杆的设置延迟钢管局部屈曲的发生,有助于L形钢管混凝土偏压短柱承载力的提高;偏心受压下该柱的截面应变符合平截面假定。采用带约束拉杆L形钢管的管内核心混凝土本构关系,利用纤维模型法对试件偏压极限承载力进行数值计算,计算结果与试验结果吻合良好。利用该数值方法对带约束拉杆L形钢管混凝土偏压短柱进行参数研究,分析了钢材屈服强度、截面含钢率、混凝土强度、拉杆约束系数及荷载角对N/Nu-M/Mu曲线的影响规律,在此基础上提出带约束拉杆L形钢管混凝土偏压短柱双向压弯承载力的简化计算公式。
It is an effective way to improve the mechanical properties of CFST columns in the middle of the steel plate by setting the horizontal tie rod with the constraint of the convex deformation of the steel plate. In this paper, eight specimens of L-shaped concrete-filled short columns with constrained tie bars are introduced. The results show that the restrained tie bars delay the local buckling of the steel tubes and contribute to the improvement of the bearing capacity of L-shaped concrete filled steel tubular short columns The cross-sectional strain of the column under eccentric compression complies with the assumption of flat section. The constitutive relation of the core concrete in the pipe with restrained rod L-shaped steel pipe is adopted. The fiber model is used to calculate the ultimate bearing capacity of the specimen. The calculated results are in good agreement with the experimental results. The numerical method was used to study the parameters of the L-shaped concrete-filled short columns with restraining rod, and the influence of the yield strength, the steel content in the section, the concrete strength, the restraint coefficient of the tie rod and the load angle on the N / Nu-M / Mu curve On this basis, a simplified calculation formula of bearing capacity of L-shaped CFST short columns with restrained tension bar is proposed.