方钢管混凝土轴压短柱的力学性能研究

发布时间：2018-04-06 22:28

本文选题：结构工程　切入点：方钢管混凝土短柱　出处：《深圳大学学报(理工版)》2014年06期

【摘要】：为研究方钢管混凝土轴压短柱力学性能,采用试验和ABAQUS有限元模拟分析相结合的方法,得到方钢管混凝土短柱实用承载力计算公式.对3根方钢管混凝土轴压短柱试件进行试验研究,并应用ABAQUS软件对其进行三维实体有限元分析,模拟结果与试验结果吻合较好.首先,在有限元模型得到验证的基础上,基于有限元法进行大量参数分析,确定方钢管混凝土轴压短柱极限状态时方钢管平均纵向应力与屈服强度的比值;其次,根据有限元模型得出核心混凝土处于极限状态时的应力云图,并将其简化为不受方钢管约束的非加强区核心混凝土和受方钢管均匀约束的加强区核心混凝土,确定两者的面积比;最后,在前两者的基础上根据极限平衡理论,提出一种新的方钢管混凝土轴压短柱承载力实用计算公式,并将该公式和现有公式计算结果以及已有的98组方钢管混凝土轴压短柱有效试验结果进行对比.结果表明,该公式计算结果与试验结果吻合最好.
[Abstract]:In order to study the mechanical properties of concrete-filled square steel tubular columns under axial compression, a practical formula for calculating the bearing capacity of concrete filled square steel tubular short columns is obtained by combining tests with ABAQUS finite element simulation analysis.Three specimens of concrete-filled steel tubular (CFST) short columns under axial compression were tested and analyzed by ABAQUS software. The simulation results are in good agreement with the experimental results.Firstly, on the basis of the verification of the finite element model, a large number of parameter analysis based on the finite element method is carried out to determine the ratio of the average longitudinal stress to the yield strength of the square steel tube under the limit state of the concrete filled square steel tube under axial compression.According to the finite element model, the stress cloud diagram of the core concrete in the limit state is obtained, and it is simplified as the core concrete in the non-strengthened zone without the restriction of the square steel tube and the core concrete in the strengthened zone with the uniform constraint of the square steel tube.Finally, based on the limit equilibrium theory, a new practical formula for calculating the bearing capacity of concrete filled square steel tube columns under axial compression is proposed.The calculated results of this formula are compared with those of the existing formulas and the effective test results of 98 groups of concrete filled square steel tubular columns under axial compression.The results show that the calculated results are in good agreement with the experimental results.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(50908230) 国家科技支撑计划资助项目(2011BAJ09B02)~~
【分类号】：TU398.9

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