斜向梁柱外伸端板连接节点的恢复力模型研究

Restoring force model of sloped extended end-plate moment connections

为简化实际工程结构中斜向梁柱外伸端板连接节点的分析与设计,利用欧洲规范EC3的组件法提出了斜向梁柱外伸端板连接节点的恢复力模型。首先,采用组件法计算了斜向梁柱外伸端板连接节点的初始转动刚度和屈服承载力,提出了外伸端板连接节点考虑钢梁倾角影响的初始转动刚度计算公式。通过对试验试件骨架曲线的无量纲化拟合了此类节点的三折线骨架曲线模型。通过回归分析确定了斜向梁柱外伸端板连接节点的卸载刚度计算公式。在此基础上,建立了斜向梁柱外伸端板连接节点的三线型恢复力模型。通过与试验及参数有限元分析结果的对比,验证了斜向梁柱外伸端板连接节点恢复力模型的准确性,研究成果可为斜向外伸端板连接节点的工程分析提供参考。

In order to simplify the design and analysis of the sloped extended end-plate connections in engineering structures, the restoring force model of the sloped beam-column extended end-plate connections is proposed on the basis of the Eurocode EC3 component method.Firstly, the component method is used to calculate the yield bearing capacity and rotational stiffness of the sloped extended end-plate connections, and the initial rotational stiffness is modified by considering the influence of sloped angle in the extended end-plate connections.The skeleton curves obtained from the tests are normalized, and a unified trifold skeleton curve model is obtained by a curve-fitting approach.Based on the regression analysis, the unloading stiffness degradation equation of the extended end-plate connection joints was determined.On this basis, the trilinear restoring force model of the sloped extended end-plate connections was established.According to the comparison between experimental results and FE analysis results, the accuracy of the restoring force model of this connection is verified, and the result can provide guidance for the engineering analysis of the sloped extended end-plate connections.