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使用有限元程序模拟螺栓连接冷弯型钢抗弯节点的弯矩-转角滞回性能和失效变形。在模拟螺栓连接的响应系数时遇到的最主要问题即是滑移的存在。对在循环荷载下的6个装配冷弯型钢弯曲梁、一个支撑柱和一个贯穿板的梁柱进行试验。连接件的弯矩-转角性能由弯曲梁或连接件的滑动螺栓所控制。提出的有限元模型包含梁的几何缺陷、由拉伸试验所得出的材料特性和两种性能的滑移螺栓。修正后的有限元模型可以更准确地预测梁的受抗弯性能影响的连接件其弯矩-转角的滞回性能。一个简化的循环滑移模型可在一个已降低的滑动阻力下进行滑移,并能较好地模拟受滑移螺栓支配的连接件的滞回性能。可使用修正后的有限元模型模拟预测出连接件的失效模式,且与试验数据吻合较好。
The finite element method is used to simulate the moment - corner hysteretic behavior and failure deformation of the bolted joints at the cold - formed section. The main problem encountered in simulating the response of bolted connections is the presence of slippage. Six assembled cold-formed steel bending beams, one support column and one through-the-plate beam were tested under cyclic loading. The moment-moment performance of the connection is controlled by the sliding bolts of the bending beam or connection. The proposed finite element model includes the geometric imperfections of the beam, the properties of the material resulting from the tensile test, and the sliding bolts of both properties. The modified finite element model can predict more accurately the moment-rotation hysteretic behavior of the connector due to the flexural behavior of the beam. A simplified cyclic slip model can slip under a reduced sliding resistance and better simulate the hysteretic behavior of the connector at the expense of the slip bolt. The modified finite element model can be used to simulate the failure mode of the connector, which is in good agreement with the experimental data.