高强钢外伸式端板节点性能试验与有限元分析

Experimental and Numerical Analysis on High Strength Steel Extended Endplate Connections

为了解高强钢端板连接节点的受力性能和失效机理,对Q690和Q960高强钢端板连接节点进行足尺模型试验研究和有限元模拟分析,并将试验结果与采用欧洲规范EC3的计算结果、有限元分析结果进行对比.研究结果表明:节点的失效模式为端板破坏和螺栓断裂;高强钢端板连接节点具有良好的转动能力;EC3中用于普通钢端板连接节点承载能力计算和失效模式预测的组件法可直接用于高强钢端板连接节点,但转动刚度的计算公式并不适用,且EC3关于保障节点转动能力的相关要求对高强钢端板连接节点偏于保守.本文建立的有限元模型可准确模拟该端板连接节点的弯矩-转角关系和失效模式.

In order to reveal more information and understand the behavior and failure mechanisms of high strength steel endplate connections, a full-scale experimental and numerical study is carried out and presented in this paper. Moreover, their experimental behaviors are compared to the numerical results and relative provisions of Eurocode 3. The test results show that the failure mode of high strength steel end plate connections is bolt failure with flange yielding, and the rotation capacity of high strength steel beam-to-column end plate connections is sufficient. Furthermore, the component-based method of Eurocode 3 based on mild steel connections is used to calculate the plastic resistance and to predict the failure mode of high strength steel end plate connections, but it is not suitable to predict their stiffness. Meanwhile, the suggestions on rotation capacity of connections proposed in Eurocode 3 are too conservative for high strength steel end plate connections. The validation of this numerical modelling against all representative experimental results is further verified on moment-rotation relationship and failure mode, which shows good agreements.