超大承载力端板连接节点有限元分析和设计方法

发布时间：2018-04-15 18:17

本文选题：钢结构 + 超大承载力　；参考：《土木工程学报》2017年03期

【摘要】：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。
[Abstract]:Ultra-large bearing capacity end-plate connections can provide greater flexural capacity than common end-plate connections and large load-carrying end-plate connections, and can be used in large-span or heavy-load steel structures.Due to the uneven distribution of bolt tension and the complicated state of end-plate bearing end-plate connections, the existing design methods of end-plate connections can not be directly applied.In this paper, the finite element model of the end-plate connection with super-large bearing capacity is established, and the reliability of the model is verified by the existing tests, and the mechanical behavior of the end-plate connection under monotonic load is analyzed by using the finite element model.The yield line model of end plate in tension zone and the distribution model of tension force of bolt in tension zone under bending moment are presented.On the basis of the proposed model, a design method for the flexural bearing capacity of end-plate connections with super large bearing capacity is proposed based on the code of our country.Compared the design values of the proposed design method and the yield bearing capacity obtained by finite element method, the design results obtained by the method under the limit condition of tensile limit of high strength bolts stipulated in the code of our country are relatively safe.
【作者单位】：清华大学土木工程系;清华大学土木工程安全与耐久教育部重点实验室;上海中远川崎重工钢结构有限公司;
【基金】：国家自然科学基金(51478244),国家自然科学基金优秀青年基金(51522806)
【分类号】：TU391

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