中文摘要：

采用有限元分析软件ANSYS对钢管与核心自应力混凝土界面粘结性能进行分析，对混凝土施加温度作用模拟自应力混凝土的特性，建立了钢管自应力混凝土推出试验的分析模型．将模型分析所得的界面粘结强度和粘结强度一滑移曲线与20组试验数据进行对比研究，结果表明数值分析结果与试验结果吻合良好．在此基础上，探讨了不同自应力、核心混凝土强度及含钢率对钢管自应力混凝土界面粘结强度的影响，结果表明，钢管自应力混凝土的界面粘结强度受核心自应力混凝土强度的影响不明显，随含钢率的增大而略有增大，随自应力值的增大而显著增大．

英文摘要：

A nonlinear finite element model in the ANSYS program is achieved for carrying out test of self- stressing concrete filled steel tubes. The effect of self-stressing is considered by imposing thermal load on the core concrete. The calculated results of bond strength and bond strength-slip curve are in good agree- ment with the 20 groups of experimental results. Based on this model, further numerical simulation is made to find the influence of different factors on bond behavior. The factors influencing bond behavior, sush as self-stressing, strength of core concrete and the ratio of steel content are discussed. The results show that the strength of core concrete has no obvious effect on the bond strength of self-stressing concrete filled steel tube, that the bond strength is improved significantly with the enhancing of magnitude of self- stress and improved slightly with increase of width-to-thickness ratio.