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收集了近年来的两批矩形钢管混凝土柱的试验资料,其中,柱两端所作用压力的偏心距有多种不同的组合,挠曲变形有单曲率及双曲率。根据其数据,进行了挠曲二阶效应的分析研究。矩形钢管混凝土柱在偏心压力作用下会出现塑性变形并开裂,在二阶效应分析中须考虑其对柱截面弯曲刚度的影响。将柱视为等效弹性体,对于承载力极限状态设计阶段,利用理论公式并采用调整后的柱截面弯曲刚度,提出了计算方法,计算结果与试验数据吻合良好。将此方法应用于矩形钢管混凝土柱的设计,考虑二阶效应影响,求得弯矩增大系数。
The experimental data of two batches of CFST columns in recent years were collected. Among them, there are many different combinations of the eccentric pressures of the pressure acting on both ends of the column, and the flexural deformation has single curvature and double curvature. Based on the data, the analysis of flexural second-order effects was carried out. Rectangular CFST columns will deform plastically and deform under eccentric pressure. In the second-order effect analysis, the influence on the bending stiffness of column section must be considered. Considering the column as the equivalent elastic body, the calculation method is proposed by using the theoretical formula and the adjusted bending stiffness of the column section. The calculated results are in good agreement with the experimental data. Applying this method to the design of rectangular CFST columns, considering the second-order effect, the coefficient of increase of moment is obtained.