边框架弱轴加腋连接抗震性能研究

发布时间：2019-01-04 19:58

【摘要】：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。
[Abstract]:In this paper, a new type of box reinforced I-shaped column weak axis connection in nodal domain is proposed. Based on this joint form, full-scale standard specimens and axillary specimens of side frame joints are designed to carry out monotone load test. The finite element software ABAQUS is used to simulate and verify the mechanical behavior of the two joints under monotone load, and then the finite element simulation analysis of the two joints under low-cycle repeated load is carried out. The results show that the two kinds of joints can form plastic hinge on the beam under load, and the joint domain and I-shaped column are basically in elastic state, which shows that the new type of weak axis connection can fit "strong column and weak beam" well. The seismic design concept of "strong joint and weak component" has the characteristics of "strong joint domain"; The rotational stiffness of the joint can be increased by adding axillary beam, but its ductility is slightly lower than that of the standard specimen, and the plastic rotation ability of both the standard specimen and the axillary specimen can reach 0.03 rad;. The plastic hinge on the beam with axillary specimen is formed on the outer side of the strengthened zone, and the stress at the weld of the upper and lower flange of the beam end is obviously smaller than that of the standard specimen.
【作者单位】：长安大学建筑工程学院;西安市mP灞生态房地产开发有限公司;
【基金】：国家自然科学基金项目(51278061)~~
【分类号】：TU352.11

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