基于ABAQUS的全钢装配式牛腿安装间隙研究

Research on the mounting clearance of fabricated steel corbels based on ABAQUS

全钢装配式牛腿在安装时不可避免会出现安装间隙,通过改变侧板与柱壁安装间隙,建立有限元模型,分析研究了常温下节点荷载-变形关系、弯矩-转角关系和高温下的抗火性能。结果表明:钢牛腿节点呈现出半刚性节点特征。常温下,随着安装间隙的加大,牛腿节点会早于间隙小的节点进入塑性阶段,且节点的极限承载力略微降低。节点的初始刚度随肋板的加厚而增加,侧板与柱壁安装间隙会显著降低节点刚度,安装间隙越大,节点的初始转动刚度越低。在火灾高温下,安装间隙的加大会略微降低节点的耐火极限。因此,在实际安装过程应当尽可能提高制作精度,把安装间隙控制在0.5mm之内。

It is inevitable that there will be mounting clearance during the installation of fabricated Steel Corbels.By changing the mounting clearance between the side plate and the column wall,the finite element model was established to analyze and study the load-deformation relationship,moment-angle relationship and fire resistance at high temperature.The results show that the fabricated steel corbels have the characteristics of semi-rigid joints.Under normal temperature,along with the increase of installation clearance,the joint will enter the shaping stage earlier than the joint with small clearance,and the ultimate bearing capacity of the joint will be slightly reduced.The initial stiffness of the joint increases with the thickness of the rib plate,and the installation gap between the side plate and the column wall will significantly reduce the joint stiffness.The larger the installation gap,the lower the initial rotational stiffness of the joint.In the high temperature of fire,the increase of installation gap will slightly reduce the fire resistance of joints.Therefore,in the actual installation process,the manufacturing accuracy should be improved as much as possible,and the installation clearance should be controlled within 0.5mm.