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本文提出了一种新型的节点域箱形加强式工字形柱弱轴连接形式,并基于此节点形式设计边框架节点足尺标准试件和加腋试件进行单调荷载试验研究。采用有限元软件ABAQUS对两种节点在单调荷载作用下的受力性能进行模拟对比验证后,对两种节点进行低周反复荷载作用下的有限元模拟分析。研究结果表明:在荷载作用下2种节点均能在梁上形成塑性铰,节点域和工字形柱基本处于弹性状态,说明新型弱轴连接能较好地符合“强柱弱梁”、“强节点弱构件”的抗震设计理念,并具有“强节点域”的特点;采用梁端加腋方式能够增大节点的转动刚度进而提高节点的承载能力,但是其延性较标准试件略有降低;标准试件和加腋试件的塑性转动能力均能达到0.03 rad;加腋试件梁上塑性铰在加强区外侧形成,其梁端上下翼缘焊缝处的应力明显小于标准试件。
In this paper, a new type of box-shaped I-shaped weak column connection is proposed. Based on this node design, a full-scale standard specimen with side frame joints and an axillary specimen are added to carry out monotonic loading tests. The finite element software ABAQUS was used to simulate and compare the mechanical behaviors of the two kinds of joints under the monotonic load. After finite element simulation analysis of the two joints subjected to the low-cycle repeated loading, The results show that both of the two kinds of joints can form plastic hinge on the beam under load, and the node and I-beam are basically in elastic state, which shows that the new type of weak axis connection can fit well with “strong column and weak beam” “Strong node weak component ”, and has the characteristic of “strong node domain ”. Adopting beam end and axillary method can increase the rotation stiffness of node and thus increase the carrying capacity of node, but its ductility is higher than standard The specimen slightly lower; standard specimen and plus axillary specimen plastic rotation ability can reach 0.03 rad; plus axillary specimen beam plastic hinge in the reinforcement area outside the formation of the beam end of the upper and lower flange weld stress is obvious Less than the standard specimen.