圆钢管混凝土曲杆抗弯性能研究

RESEARCH ON FLEXURAL BEHAVIOR OF CURVED CONCRETE FILLED STEEL TUBULAR MEMBERS

基于ABAQUS软件建立圆钢管混凝土曲杆纯弯有限元计算模型,分析不同弯曲度下圆钢管混凝土曲杆受力过程中的荷载-挠度曲线,比较圆钢管混凝土曲杆与空钢管曲杆和钢管混凝土直杆抗弯性能的差别,并对圆钢管混凝土曲杆的工作机理进行分析。最后基于弹性理论,推导了圆钢管混凝土曲杆的抗弯刚度解析解。研究结果表明:有限元分析结果与相关试验结果及解析解均吻合良好,由于钢管和混凝土的相互作用,钢管混凝土曲杆具有良好的延性和稳定性,曲线形轴线产生的轴力使得曲杆比直杆具有更高的抗弯承载力,随着弯曲度的增大,圆钢管混凝土曲杆的抗弯承载力和刚度均有所提高。

A finite element analysis（FEA） model for curved concrete-filled steel tubular members under pure bending was developed by the software ABAQUS.The relation of load and mid-span deflection of curved concrete-filled steel tubular members with the change in degree of bending was analyzed.The flexible behavior of curved concrete-filled steel tubular struts was compared with that of empty curved steel tubes and straight concrete-filled steel tube.And the behavior of the curved composite members was analyzed.Based on the elastic theory,the analytical solution of bending stiffness of concrete filled steel tubular bent bars was derived.The results showed that the numerical analysis was in good agreement with the experimental results and the analytical solution.The concrete filled steel tubular columns had good ductility and stability due to the interaction between steel tubes and concrete.The curved concrete-filled steel tubular members had a better flexible capacity because of the axial force generated by the curve axis.With the increase of bending degree,bending stiffness and bending capacity of curved concrete-filled steel tubular were improved.