基于ABAQUS二次开发下大直径群钉抗剪性能研究

Research on Shear Performance of Large Diameter Group Nails Based on ABAQUS Secondary Development

为研究大直径群钉的抗剪性能,综合考虑大直径群钉推出试验过程中材料、接触及几何非线性,采用ABAQUS软件建立推出模型。对推出模型进行二次开发,研究预留块材料强度、栓钉直径、栓钉高度和钢梁翼缘板厚度对栓钉抗剪性能的影响。主要结论如下:集束式大直径栓钉抗剪时,增大预留块材料强度等级,钢梁翼缘板翘曲程度减小,大直径栓钉应力不均匀程度减弱,显著减小了预留块受压损伤面积。增大栓钉直径可有效提高栓钉的极限抗剪承载力,但栓钉根部后方混凝土受压损伤区域也明显增大,大直径栓钉应力不均匀程度增加,群钉效应较为显著。增大栓钉高度和钢梁翼缘板厚度对平均单钉的极限抗剪承载力影响不大,为减小钢梁翼缘板翘曲程度,可优先选择增加钢梁翼缘板厚度。研究成果可为钢-混组合结构中集束式大直径栓钉抗剪设计提供参考。

To study the shear performance of large-diameter group nails,considering the material,contact and geometric nonlinearity in the push out test of large-diameter group nails,the push out model was established by ABAQUS software.The secondary development of the model was carried out to study the influence of the strength of the reserved block material,the diameter of the stud,the height of the stud and the thickness of the flange plate of the steel beam on the shear performance of the stud.The main conclusions are as follows:when the shear resistance of bundle type large-diameter stud is increased,the warpage of steel beam flange plate is reduced,and the uneven stress of largediameter stud is weakened,which significantly reduces the compression damage area of the reserved block.Increasing the diameter of the stud can effectively improve the ultimate shear capacity of the stud,but the compressive damage area of the concrete behind the stud root also increases significantly,and the uneven stress of the large diameter stud increases,and the group stud effect is more significant.Increasing the stud height and the flange plate thickness of the steel beam have little effect on the ultimate shear capacity of the average single nail.To reduce the warpage of the flange plate of the steel beam,it is preferred to increase the flange plate thickness of the steel beam.The research results can provide a reference for the shear design of bundled large diameter studs in steel-concrete composite structures.