异形钢管混凝土柱偏压承载力统一算法研究

为方便T形、L形和十字形钢管混凝土柱的工程设计，结合国内外相关规程计算方法，采用自编程序对异形钢管混凝土柱压弯相关方程曲线进行了计算分析，提出异形钢管混凝土柱偏压承载力统一算法，最后对不同截面形式及构造的异形钢管混凝土柱偏压承载力进行了算法验证.结果表明：统一算法力学意义明确，操作简单易行，具备一定的安全储备；承载力试验值与计算值比值的均值为1.1~1.4，其计算精度与荷载作用截面的工程轴有关.统一算法的提出补充完善了异形钢管混凝土柱计算理论，利于异形钢管混凝土结构的推广应用.
For the convenience of engineering design on T-shaped, L-shaped, and cross-shaped concrete filled steel tubular (CFST) columns, a unified algorithm for eccentric-loaded capacity of special-shaped CFST columns was developed through an analysis of calculation methods in the typical specifications. The N-M relationship curves of columns were calculated and analyzed by using a self-complied numerical analysis method. The validity of the algorithm was then verified by experimental results in other literatures for various cross-section forms of special-shaped CFST columns. The results show that the uniform algorithm has clear mechanical meaning and it is easy to operate. The mean ratio of the test result to prediction of load bearing capacity is 1.1~1.4, with a certain safety reservation, but the prediction accuracy depends on the engineering axis direction of loading cross-section. The proposed unified algorithm improves the computational theories for special-shaped CFST columns, which can promote its developments and applications in the practical engineering.