In order to study the bending bearing capacity and stiffness of frame columns,a three-dimensional solid finite element model was established,which was verified well with the results of quasi-static tests,162 full-scale reinforced concrete columns were further established for parameter analysis.The influence of various parameters on the bearing capacity and stiffness of the column was discussed,and the practical calculation formula of the bearing capacity and stiffness of the column under the influence of parameters was proposed.The results show as follows.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.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.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.
关键词
钢筋混凝土柱/压弯承载力/压弯刚度/实用计算公式/有限元分析
Key words
reinforced concrete column/compression-bending capacity/bending stiffness/practical calculation formula/finite element analysis
维普
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