螺栓节点板抗剪连接的有限元模拟方法研究

FINITE ELEMENT SIMULATION METHODS APPLIED TO BOLTED GUSSET PLATES USED AS SHEAR CONNECTORS

为了分析螺栓节点板抗剪连接的受力性能,采用常见的三种有限元方法进行模拟计算,比较不同方法的计算结果、建模难度和计算效率等,并将某简单实例的有限元分析结果与试验结果进行比较,最后给出有限元模拟方法的应用建议。研究表明:接触加预紧力是相对最为合理的一种方法,但该方法建模复杂、计算费时;其次是耦合螺孔节点方法,但该方法会在耦合节点处产生应力和位移的畸变;直接粘接方法的模拟效果最差,主要因为该方法将各块连接板粘接成一个整体参与受力,从而导致连接板处的计算结果偏小。

Three commonly-used Finite Element simulation methods were employed to study the mechanical behavior of bolted gusset plates used as shear connectors. The calculating results, modeling complexity and simulation costs of these three methods were compared. Then the results of a simple example obtained from finite element methods were compared with those obtained from the experiments. Finally, suggestions to use the finite element method to simulate the bolted gusset plates are given. The study show that the most suggested method is the method considering contacts on the plates and applying pretension loads on the bolts. However, this method is the most complicated in modeling and requires the maximum calculating cost among the three methods. The second suggested method is to couple the nodes at the screw holes on different gusset plates. One of disadvantages of this method is that the distortion in stress and displacement on the coupling nodes is significant. The method by gluing the different gusset plates together is the worst because it will result in an excessive safe result on the connecting gusset plates.