Research on Static Properties of Steel Frames with Self-Centering Column Base Joints
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摘要: 为解决传统装配式钢框架结构残余变形较大,无法有效实现结构复位的问题,提出了一种带有自复位柱脚节点的新型钢框架结构,通过有限元软件ABAQUS对8个框架模型进行了静力分析,系统研究了狗骨削弱盖板厚度、初始索力、轴压比等参数对该新型框架承载性能的影响规律。结果表明:新型自复位框架与传统刚接柱脚钢框架相比,承载力相差在5%以内,残余变形减少50%以上。新型钢框架的承载能力主要受狗骨削弱盖板厚度、初始索力和柱顶轴力三部分影响,通过合理设置各参数,可以实现不同参数组合下,框架达到相同承载能力与复位效果。Abstract: In order to solve the problem that traditional prefabricated steel frame structures have large residual deformation and cannot be effectively self-centering, a new steel frame structure with self-centering column base joints was proposed. The static analysis of 8 frame models was carried out by the finite element software ABAQUS. The influence of the thickness of the cover plate weakened by dog bone, the initial cable force and the axial compression ratio on the bearing performance of the new frame were systematically studied. The results showed that the bearing capacity of the new self-centering frame was less than 5% and the residual deformation was reduced by more than 50% compared with the traditional steel frame with rigid column base joints. The bearing capacity of the new steel frame was mainly affected by the thickness of the cover plate weakened by dog bone, the initial cable force, and the axial force at the top of the column. The frame could achieve the same bearing capacity and self-centering effect under different parameter combinations.
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