圆锥形中空夹层钢管混凝土构件压弯剪受力性能研究

Research of Tapered Concrete-Filled Double Skin Steel Tubular Members Subjected to Shear and Axial Compression

为研究圆锥形中空夹层钢管混凝土构件压弯剪受力性能,利用ABAQUS有限元软件建立了数值分析模型,计算了横向剪力-位移关系曲线,分析了构件破坏模态,提取了各组件相互作用力及荷载分配曲线;最后对影响圆锥形中空夹心层钢管混凝土构件压弯剪受力性能的主要参数进行了数值计算。结果表明:空心率、锥度、混凝土强度等级对圆锥形中空夹层钢管混凝土压弯剪构件的横向剪力峰值影响甚微,剪跨比、轴压比、钢材强度等级以及内、外钢管径厚比对其影响较为显著,且当内部钢管径厚比大于60时,极限承载力的增幅较小。

In order to study the mechanical behavior of tapered concrete-filled double skin steel tubular members subjected to shear and axial compression, a finite element model is built using ABAQUS software, the transverse shear force-displacement curve is calculated, the member failure mode is analyzed, and the contact pressure of members with each other and load distribution curve are computed.Finally, the main parameters of the shear force are numerically calculated and the influence law is obtained.The results show that the hollow ratio, taper, and concrete strength grade have little effect on the peak transverse shear force, shear span ratio, axial compression ratio, steel strength grade, but the diameter-to-thickness ratio of internal and external steel pipes have significant effects on it.When the internal-to-internal steel pipe diameter-to-thickness ratio is larger than 60,the increase in the ultimate bearing capacity is small.