超大承载力端板连接节点有限元分析和设计方法

超大承载力端板连接节点能够提供比普通构造的端板连接节点和大承载力端板连接节点更大的抗弯承载力，可以应用于大跨或重载钢结构中。由于超大承载力端板连接节点的螺栓拉力分布不均匀、端板受力状态复杂，现有的端板连接节点设计方法不能直接应用。此文建立超大承载力端板连接节点的有限元模型，通过已有试验验证模型的可靠性|利用有限元模型分析单调荷载下超大承载力端板连接节点的受力性能，提出弯矩作用下受拉区端板的屈服线模型和受拉区螺栓承担拉力的分布模型。在所提模型的基础上基于我国规范提出超大承载力端板连接节点的抗弯承载力设计方法。比较所提设计方法得到的节点抗弯承载力设计值与有限元得到的屈服承载力，在我国规范规定的高强度螺栓受拉极限状态条件下所提方法得到的设计结果偏于安全。

Finite element analysis and design method for ultra-large capacity end-plate connections

The ultra-large capacity end-plate connections, which can be applied in steel structures with large spans or heavy loads, can provide larger moment resistance than the ordinary end-plate connections and the large capacity end-plate connections. However, the design method for the ordinary end-plate connections cannot be applied to the new-form connections directly because of the inhomogeneous distribution of the tension load carried by the bolts as well as the complicated stress state in the end plate. Finite element models are established and validated to be reliable with the existing test results. The performance of the ultra-large capacity end-plate connections is analyzed with the proposed model. The yield line model of the end plate in the tension side, as well as the distribution model of the tension load carried by the bolts in the tension side, is proposed according to the results. Based on the Chinese code and the proposed models, a design method for the ultra-large capacity end-plate connections is presented. The design moment resistance of the ultra-large capacity end-plate connections obtained by the proposed method is compared to that of the finite element models. Under the ultimate limit state of high-strength bolts specified in the Chinese code, the proposed method can offer a safer result.