螺栓准距是角钢螺栓节点设计的重要内容,合理的螺栓准距有利于提高角钢节点的承载力.为了研究大规格角钢节点的最优准距,针对节点布置3排螺栓的情况,进行了18个不同节点模型的有限元计算.通过对计算结果的对比分析,研究了节点的极限承载力、破坏形态.结果表明:最优准距与螺栓规格有关,现行规范中不区分螺栓规格而确定节点螺栓准距的方法是不妥的.以∠220×20规格的角钢为例,给出了角钢节点布置3排螺栓时的最优准距,以便于工程应用. Bolt quasi-pitch angle bolt is an important part of the design, reasonable bolt quasi-pitch angle is conducive to improve the bearing capacity of angle.In order to study the optimal alignment of large-size angle node, the node arrangement of three rows of bolts, the 18 The results show that the optimal distance is related to the bolt specification, and the current specification does not distinguish between the bolt specification and the node Bolt quasi-distance method is wrong.With the angle of ∠220 × 20 specifications as an example, given the angle of the node arrangement of the three rows of bolts when the optimal distance to facilitate engineering applications.