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为研究传统风格建筑钢结构节点的抗震性能以及各设计参数对节点受力的影响,设计制作了缩尺比例为1∶2.6的1个传统风格建筑钢结构单梁柱中节点SBJ-1和1个传统风格建筑钢结构双梁柱中节点DBJ-1,并对其进行了动力加载试验,根据试件破坏过程以及试验所得的滞回曲线和骨架曲线,分析节点的破坏模式、受力特点,并对SBJ-1试件和DBJ-1试件的抗震性能进行对比。试验结果表明:节点的屈曲变形都集中于梁端,试件最终破坏缘于梁端塑性铰区的母材撕裂,DBJ-1试件的刚度和承载能力要显著高于SBJ-1试件。在动力荷载作用下,试件达到极限点后的承载能力降低速度较快,强度衰减和刚度退化速度较快。在试验的基础上,使用ABAQUS有限元分析软件对节点进行了模拟,验证了有限元模型的有效性,通过改变试件轴压比、箱型梁壁厚以及上、下梁间距对节点进行参数分析,结果显示:轴压比越大,试件的刚度和承载能力越低,但影响有限;增大箱型梁的厚度能够显著提高试件的刚度和承载能力;改变双梁柱节点的上、下梁间距时其受力性能影响极小。
In order to study the seismic performance of traditional structural steel structure nodes and the effect of each design parameter on the joint force, a conventional steel structure single-beam column node SBJ-1 with a scale ratio of 1: Based on the specimen destructive process and the hysteresis curve and the skeleton curve obtained from the test, the failure mode and force characteristics of the node are analyzed, and the model of SBJ- 1 specimens and DBJ-1 specimen for comparison. The experimental results show that the buckling deformations of the joints are concentrated on the beam ends, and the specimen finally ruptures the base material tearing due to the plastic hinge zone at the beam ends. The stiffness and load carrying capacity of DBJ-1 specimen are significantly higher than those of SBJ-1 specimen . Under the action of dynamic load, the ultimate bearing capacity of the specimen decreases rapidly, the strength decays and the stiffness degenerates rapidly. Based on the experiments, the finite element analysis software ABAQUS was used to simulate the nodes to verify the effectiveness of the finite element model. The parameters of the joints were analyzed by changing the axial compression ratio, the wall thickness of the box girder and the spacing between the upper and lower beams. The results show that the higher the axial compression ratio is, the lower the stiffness and load bearing capacity of the specimen are, but the impact is limited. Increasing the thickness of the box beam can significantly increase the stiffness and load carrying capacity of the specimen. Beam spacing when the force of its minimal impact.