论文部分内容阅读
在正常使用荷载作用下,梁柱节点将承受负弯矩的作用,然而当结构中关键柱受到破坏而失效后,荷载向下的传力路径被切断,由柱承担的荷载转而由与之相连的梁来承担,此时梁柱节点将承受正弯矩和拉力的共同作用。为研究钢管混凝土柱-钢梁刚接节点在拉弯共同作用下的力学性能,共完成了2个钢管混凝土柱-钢梁刚性节点的试验,并建立了相应的有限元模型,进行了节点拉弯性能的参数分析。研究结果表明:外环板节点和外伸内隔板节点的初始刚度相近,均能满足刚接节点对初始刚度的要求;节点弯矩-拉力关系曲线表现为随着拉力的增大,其受弯能力不断降低,但初期降低不显著;不同初始弯矩条件下,拉力对节点受弯承载力均有不同程度的降低,初始弯矩越低,在受荷初期拉力对其受弯承载力的影响越小。
Under normal service load, the joint of beam and column will bear the negative moment. However, when the key column in the structure is destroyed and failed, the downward force path of load is cut off and the load borne by the column is replaced by Connected to the beam to bear, at this time beam and column nodes will bear the common role of positive bending moment and tension. In order to study the mechanical behavior of the concrete filled steel tubular column-steel beam joint under tension and bending, a total of two CFST-steel beam rigid joints were tested, and the corresponding finite element model was established. Parametric Analysis of Bending Properties. The results show that the initial stiffness of the joints of the outer ring plate and the inner ridges of the outriggers are close to each other, which can meet the initial stiffness requirements of the joints. The bending moment tension curves of the joints show that as the tension increases, The bending capacity decreases continuously, but the initial reduction is insignificant. Under different initial bending moment conditions, the tensile strength decreases the flexural capacity of the joints to some extent. The lower the initial bending moment is, the lower the initial bending moment is. The impact is smaller.