带加劲肋顶底角钢梁柱连接节点试验研究

发布时间：2018-12-31 17:08

【摘要】：为了研究带加劲肋顶底角钢梁柱连接节点受弯性能与抗震性能,分别进行了5个不同构造的角钢连接试件的单调加载试验和4种带加劲肋角钢连接试件的循环加载试验。单调加载试验结果表明:节点在负弯矩作用下,仅增设顶角钢加劲肋能够较大幅提高节点初始转动刚度与荷载,破坏模式为加劲肋处焊缝脱开;仅增设底角钢加劲肋对节点初始转动刚度影响较小,但能够增加节点的荷载。采用循环加载试验分别考察了4种不同构造的加劲肋角钢连接节点的破坏机制、滞回曲线、延性、耗能、以及刚度。结果表明:加劲肋顶底角钢连接节点是一种典型的半刚性、部分强度连接,具备良好的转动能力和耗能能力,节点破坏模式为角钢与加劲肋处呈弧状塑性铰断裂,极限弯矩对应的层间位移角均在0.04 rad以上,可满足美国规范FEMA 350不小于0.03 rad的延性设计要求。在加劲肋试件达到层间位移角0.08 rad时,节点还能够承受0.5Mmax以上的弯矩。
[Abstract]:In order to study the flexural and seismic behavior of Liang Zhu connections with stiffened ribbed roof and bottom, the monotone loading tests of five different structures and the cyclic loading tests of four kinds of stiffened ribbed angle steel connection specimens were carried out respectively. The results of monotone loading test show that the initial rotational stiffness and load of the joint can be greatly improved by adding only the top angle steel stiffener under the negative bending moment, and the failure mode is that the weld line at the stiffening rib is detached. Only adding the bottom angle steel stiffener has little effect on the initial rotational stiffness of the joint, but it can increase the load of the joint. The failure mechanism, hysteretic curve, ductility, energy dissipation and stiffness of four different structures of stiffened ribbed joint were investigated by cyclic loading test. The results show that the joint is a typical semi-rigid, partial strength connection, with good rotational and energy dissipation capacity. The failure mode of the joint is the fracture of the angle steel and stiffened rib with curved plastic hinge. The interstory displacement angle corresponding to the ultimate bending moment is above 0.04 rad, which can meet the ductility design requirements of FEMA 350 not less than 0.03 rad. When the stiffened ribbed specimen reaches the interstory displacement angle of 0.08 rad, the joint can also withstand the bending moment above 0.5Mmax.
【作者单位】：华南理工大学土木与交通学院;华南理工大学亚热带建筑科学国家重点实验室;
【基金】：国家自然科学基金项目(51378009,51378219,51638009) 亚热带建筑科学国家重点实验室基金项目(2017ZB28)
【分类号】：TU391

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