ABAQUS中钢框架梁柱节点（梁柱均用壳单元）接触面处理？

背景：用abaqus 建钢框架；钢梁、钢柱均采用壳单元；因不考虑节点焊缝的影响，梁柱节点刚性连接，用tie绑定。 问题：想请教一下，在梁柱壳单元的接触面，用surface-surface；计算时报错；“62 nodes are used more than once as a slave node in *TIE keyword. These constraints are not removed either due to the presence of *CONSTRAINT CONTROLS,NO CHANGES keyword or because removing the constraints might affect the model. The nodes have been identified in node set ErrNodeOverconTieSlave.” 这个问题该从哪个方面去找原因并解决呢？