平齐端板连接方中空夹层钢管混凝土柱-钢梁节点承载性能有限元分析

Finite Element Analysis of Bearing Performance of Square Concrete Filled Double Skin Steel Tube Column-Steel Beam Joint With Flush End Plates

为了探讨单调载荷作用下平齐端板连接的方中空夹层钢管混凝土柱-钢梁节点的承载性能,基于ABAQUS软件建立该组合节点在柱端加载方式下的有限元模型,利用已有试验结果对模型进行验证,结果吻合良好。对典型节点核心区的弯矩(M)-转角(θ_(r))曲线进行受力全过程分析,在此基础上对组合节点模型进行参数分析,研究钢梁屈服强度(f_(y,b))、钢柱屈服强度(f_(y,c))、组合柱空心率(χ)、螺栓直径(d_(b))、螺栓预拉力(P)和端板厚度(t_(ep))等参数对节点静力性能的影响。结果表明:单调载荷作用下该类节点核心区的抗弯承载力随着钢梁屈服强度、钢柱屈服强度、螺栓直径、螺栓预拉力和端板厚度的增大而增大;初始刚度随着螺栓直径和端板厚度的增大而增大,随着组合柱空心率的增大而减小。

In order to explore the bearing performance of the square concrete filled double skin steel tube column-steel beam joint with flush end plates under monotonic loads,a finite element model of the combined joints under the column end loading mode was established based on the ABAQUS software,and the existing test results were used to carry out the model verify that the results are in good agreement.The bending moment(M)-rotation angle(θ_(r))curve of the typical node core area was analyzed for the whole process of force.On this basis,the parameter analysis of the composite node model was carried out to study the yield strength of steel beams(f_(y,b))and the yield of steel columns(f_(y,c)),composite column hollow rate(χ),bolt diameter(d_(b)),bolt pretension(P)and end plate thickness(t_(ep))on the static performance of joints.The results show that the flexural bearing capacity of the core area of this type of joint under monotonic load increases with the increases of steel beam yield strength,steel column yield strength,bolt diameter,bolt pretension and end plate thickness;The initial stiffness increases with the increase of bolt diameter and end plate thickness,and decreases with the increase of the hollow rate of the composite column.