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针对常规钢管混凝土柱-钢梁节点核心区混凝土常发生斜压破坏引起钢管柱损坏的问题,研究了在梁柱结合部位设置槽钢过渡段的节点形式,考虑到该类节点刚度与承载力有限,在钢管柱与钢梁间设置隅撑并进行相关研究。通过对5个钢管柱-钢梁槽钢节点、两个钢管混凝土柱-钢梁槽钢节点与一个设置隅撑的钢管混凝土柱-钢梁槽钢节点的试验与有限元模拟,分析了该类节点的受力性能与破坏形态。结果表明:节点失效时,钢管柱钢梁节点柱壁与槽钢腹板均发生较大变形,钢管混凝土柱钢梁节点破坏则主要发生在槽钢腹板上,槽钢腹板厚度对节点承载力影响明显;槽钢节点具有较好的转动能力与承载力,为半刚性节点;设置隅撑后,破坏主要发生在隅撑上,结构刚度显著提高,降低了节点处的受力,槽钢翼缘所受剪力减小;通过对所设置隅撑进行局部削弱处理,可以实现预选塑性区,控制结构破坏顺序,保护梁柱结合部位并简化节点设计。
In order to solve the problem of steel column damage caused by baroclinic failure in the core of conventional CFST-steel beam joints, the joint form of channel transition section is set up at the joint of beam and column. Considering the limited stiffness and limited bearing capacity of such joints, , Set up between the steel column and steel beam arch support and related research. Through the experiment and finite element simulation of five steel column-steel beam channel joints, two CFST columns-steel beam channel joints and one CFST-steel-reinforced concrete channel node, Nodal stress behavior and failure modes. The results show that when the node fails, the column wall and the channel web of the steel column girder node are greatly deformed. The failure of the steel tube column of the concrete-filled steel column mainly occurs on the channel web, and the thickness of the channel web on the node bearing The influence of force is obvious; the channel node has good rotation capacity and bearing capacity, which is a semi-rigid node; after setting up the support, the damage mainly occurs on the support, the structural rigidity is significantly increased, reducing the stress at the node, The shear force on the flange decreases; and by locally weakening the set support, the pre-selected plastic zone can be realized to control the structural failure sequence, protect the joint of the beam and column and simplify the design of the node.