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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。
In order to study the flexural behavior and seismic performance of the beam-column connections with stiffener top and bottom corners, the monotonic loading tests of five different configurations of angle steel connecting specimens and the cyclic loading tests of four specimens with stiffened angle steel connections . The results of monotonic loading show that the addition of top stiffener can greatly increase the initial rotation stiffness and load of joints under the action of negative moment, and the failure mode is that the weld of stiffener is disengaged. The initial rotation stiffness has less effect, but it can increase the node load. The failure mechanism, hysteresis curve, ductility, energy dissipation, and stiffness of four kinds of joints with different configurations of stiffener angle were investigated by cyclic loading tests. The results show that the connection node between the top and the bottom of the stiffener is a typical semi-rigid and partially-strength connection with good rotation and energy dissipation. The failure mode of the joint is an arc plastic hinge fracture between the angle steel and the stiffener. The ultimate bending moment The corresponding layer displacement angles are all above 0.04 rad, which can meet the ductility design requirements of the American Standard FEMA 350 not less than 0.03 rad. When the stiffener specimen reaches a displacement of 0.08 rad, the node can still bear the bending moment above 0.5Mmax.