钢筋混凝土柱压弯承载力与刚度实用计算方法

框架柱作为竖向承重以及横向抗侧移构件，对其压弯性能研究尤为重要。利用ABAQUS软件建立三维实体模型，在与拟静力试验结果验证的基础上，进一步建立162根足尺钢筋混凝土柱有限元模型算例进行参数分析，探讨了各参数对柱的承载力、刚度的影响，提出了参数影响下的柱承载力、刚度实用计算公式。结果表明:(1)当轴压比小于或等于0.4时，随轴压比的增大，柱的压弯峰值承载力增大，当轴压比大于0.4时，随轴压比的增大，柱的压弯峰值承载力减小，提高纵筋配筋率与混凝土强度等级均能有效的增大柱的压弯峰值承载力，且提高纵筋配筋率的效果更好； (2)当轴压比小于或等于0.2时，随轴压比的增大，柱的弹性刚度增大，当轴压比大于0.2时，随轴压比的增大，柱的弹性刚度减小，提高纵筋配筋率与混凝土强度等级均能增大柱的弹性刚度；(3)提出的实用计算公式可较准确的反映有限元结果，可为实际工程中框架柱的设计作一定的参考。

Practical Calculation Method for Compression-bending Capacity and Stiffness of Reinforced Concrete Columns

As a vertical load-bearing and lateral anti-sliding member, it is particularly important to study the compression and bending performance of frame columns. The three-dimensional solid model is established by ABAQUS software. On the basis of verification with the pseudo-static test results, 162 full-scale reinforced concrete columns are further established for parameter analysis. The influence of various parameters on the bearing capacity and stiffness of the column is discussed, and the practical calculation formula of the bearing capacity and stiffness of the column under the influence of parameters is proposed. The results show that: (1) when the axial compression ratio is less than or equal to 0.4, the peak bearing capacity of the column will increase with the increase of the axial compression ratio; when the axial compression ratio is greater than 0.4, the peak bearing capacity of the column will decrease with the increase of the axial compression ratio; improving the longitudinal reinforcement ratio and the concrete strength grade can effectively increase the peak bearing capacity of the column, and the effect of improving the longitudinal reinforcement ratio is better; (2) When the axial compression ratio is less than or equal to 0.2, the elastic stiffness of the column will increase with the increase of the axial compression ratio. When the axial compression ratio is greater than 0.2, the elastic stiffness of the column will decrease with the increase of the axial compression ratio. Increasing the longitudinal reinforcement ratio and the concrete strength grade will increase the elastic stiffness of the column; (3) The practical calculation formula can accurately reflect the finite element results, and can be used as a reference for the design of frame columns in practical projects.