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为研究带加强环的方钢管再生混凝土柱-钢梁节点的抗震性能,以有无加强环以及加强环的外伸长度、厚度为试验参数,设计制作了4个方钢管再生混凝土柱-钢梁节点,对其进行低周反复加载试验,并采用有限元软件ABAQUS对粗骨料取代率的影响进行了拓展分析。结果表明:加强环的存在能够有效限制节点核心区域钢管的鼓曲变形,可以提高节点的抗震承载能力、变形性能、耗能能力、刚度及滞回曲线的饱满程度,并能延缓节点的刚度退化速率;在一定范围内,随着加强环外伸长度的增加,试件抗震承载能力随之增加,而其延性系数则会有所降低,但降低幅度相对较小;焊缝质量对方钢管再生混凝土柱-钢梁节点的破坏过程及形态有重要的影响;粗骨料取代率和加强环的厚度对节点抗震性能的影响则相对较小。
In order to study the seismic performance of the concrete filled steel tube column with reinforced concrete-reinforced concrete column-to-steel beam joints, four square steel tube recycled concrete columns, steel beams, were designed and manufactured based on the presence or absence of reinforcement rings and the overhang length and thickness of reinforcement rings. Node, the low-cycle repeated loading test, and the use of finite element software ABAQUS coarse aggregate replacement rate of the expansion analysis. The results show that strengthening the ring can effectively limit the deformation of the steel tube in the core region of the node, improve the bearing capacity, deformability, energy dissipation capacity, stiffness and the fullness of the hysteresis curve, and delay the stiffness degradation of the node Velocity; Within a certain range, with the increase of the extension of strengthening ring, the specimen carrying capacity increased, while the ductility coefficient will be reduced, but the reduction is relatively small; weld quality of the other side of steel pipe recycled concrete The failure process and morphology of the column-steel beam joints have an important influence. The influence of the coarse aggregate replacement rate and the strength of the strengthened ring on the seismic behavior of the joints is relatively small.