圆端形钢管混凝土构件的剪切力学性能研究

Shear behaviours of concrete-filled round-end steel tubular specimens

利用ABAQUS数值分析软件探究圆端形钢管混凝土柱的抗剪力学性能。建立合理的圆端形钢管混凝土柱受剪作用下的有限元模型,进行了该类典型构件的受力机理分析及参数分析。分析显示:圆端形钢管混凝土构件表现出较高的抗剪能力和变形性能;组合构件中核心混凝土承担了约58.5%荷载,对于外钢管而言,钢腹板钢管承担了大部分剪力;钢管约束后,核心混凝土的抗剪力提高了490%。基此,提出了圆端形钢管混凝土构件抗剪承载力的简化计算式。

The shear behavior of concrete-filled round-ended steel tubular(CFRST)was researched by using ABAQUS finite element(FE)software.Based on the reasonable FE model,the mechanism analysis and parameters analysis of the typical member were carried out.The analysis results show that CFRST specimens under the sheer load exhibit high strength and ductility.For the typical RECFST specimen,core concrete undertakes about 58.5%of loads.For the outer steel tube,the most of the shear load was undertaken by the web steel.Compared with the plain concrete,the shear strength of the core concrete is enhanced by 490%owing to the effective confinement from the steel tube.Finally,simplified formulas for predicting the shear strength of CFRST columns were proposed.