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以直接扩翼型、侧板加强型、翼缘板加强型、盖板加强型、狗骨削弱型和普通节点作为研究对象,对比分析6种钢结构典型刚性节点发生脆性断裂的可能性。研究采用ANSYS非线性有限元方法建模,以等效塑性应变指数(PI)和开裂指数(RI)作为断裂性能的判断指标,通过对比各类型节点的应力分布,分析3条指定路径和4个关键点的开裂指标,综合研究6种典型刚性节点的断裂性能,给出各类节点发生脆性断裂的关键位置,并得到翼缘板加强型节点防脆断能优于其他类型节点的结论。
The possibility of brittle fracture of the typical rigid joints of six kinds of steel structures was analyzed with the direct expansion wing, the side reinforcement, the flange reinforcement, the cover reinforcement, the dog bone weakening and the ordinary joints as the research objects. The ANSYS nonlinear finite element method is used to establish the model and the equivalent plastic strain index (PI) and cracking index (RI) are used as the judgment indexes of fracture properties. By comparing the stress distributions of various types of nodes, three specified paths and four The key points of cracking indicators, a comprehensive study of six kinds of typical rigid joints of the fracture properties of all kinds of nodes are given the critical location of brittle fracture, and get the flange-reinforced joints failure is better than other types of node failure conclusion.