内置加劲肋的圆端形钢管混凝土中长柱局部受压性能的模拟分析OA北大核心CSTPCD

In order to study the local compressive performance of circular-end concrete-filled steel tubular medi-um long column with built-in stiffeners,ABAQUS is used to model and analyze,and the existing relevant re-search data are used to verify the finite element model and analyze the extended parameters.The considered pa-rameters are slenderness ratio(λ=20,40,60,80,100,120,140)and aspect ratio(β=2.0、2.5、3.0、3.5、4.0).When λ＜60,the fall trend of local compressive bearing capacity with the increase of λ is small.When λ is from 60 to 140,the bearing capacity under local compression shows an obvious decreasing trend with the increase of λ.When β≤3.5,the local compressive bearing capacity increases with the increase of β.When β＞4.0,the local compressive bearing capacity decrease with the increase of β.The failure mode of the circular end concrete filled tubular medium long column under local compressive load is that the deformation of the end of steel pipe is large,and the concrete at the loading position of cushion block is concave.Based on finite ele-ment simulation results in this paper,the calculation formula of local pressure bearing capacity in this case is derived.The comparison shows that the calculated bearing capacity error is 0.85-1.15,and the calculation re-sults are better.