离心钢管混凝土扭转构件工作机理及性能研究

Study on the working mechanism and behavior of centrifuge concrete filled-steel tubular(CCFT) members subjected to torsion

在复杂应力状态下钢材与混凝土的应力-应变关系的分析基础上,针对钢管与混凝土界面滑移的特性,建立了扭转构件的非线性三维有限元分析模型,其中钢管与混凝土采用8节点固体单元模拟,并严格考虑了钢管与混凝土界面的黏结滑移.应用所建模型对离心钢管混凝土扭转构件工作性能进行了非线性有限元全过程分析.为了验证理论分析方法与模型的正确性,与完成的20组扭转构件试验进行了比较,分析表明,理论结果与试验结果吻合良好.

Aiming at the slip properties of the interface between the tube and centrifuge concrete, a nonlinear 3D finite element analytical model of torsional members has been proposed based on the analysis of the stress-strain relation of concrete and steel under multiaxial compressive load- ing. The interaction between tube and centrifuge concrete is analyzed by using nonlinear spring elements. The model has been applied for the complete curve ancdysis of centrifuge concrete-filled steel tubular （CCFT） members subjected to torsion, and the working mechanisms with behavior have been systematically studied for this kind of members. 20 CCFT members subjected to tor- sion have been tested to verify the correctness of the theoretical analysis, and it is shown that there exists satisfactory agreement between the experimental and calculated results.