Abstract Nut-free high-strength bolt permits easy installation and has been widely used in the connection between the column and the corner fitting in assembled-type light steel modular house. 33 specimens were tested under static tension to study the tensile behavior of the connection between the nut-free high-strength bolt and the endplate. The pivotal parameters considered in this experiment include the diameter of the high-strength bolt, the material property of the high-strength bolt, the length of the high-strength bolt, the material property of the endplate, and the thickness of the endplate. The tensile behavior and failure mode of the connection were evaluated and discussed based on the test results. A three-dimensional nonlinear finite element model (FEM) was established by the general-purpose finite element software ABAQUS and validated against the test results. The tensile capacity and failure mode are in good agreement with the test results and the FEM can be adopted for the analysis of the tensile behavior of the connection. The key parameters that influence the tensile capacity of the connection were the diameter, material property and length of the bolt. Whereas, the thickness and material property of the endplate have less influence. Furthermore, the simplified computation formulas were derived and a theoretical design model was established. The design model was verified by comparing the theoretical results with the test ones. It indicates that the design model can well predict the tensile behavior of the connection, which will provide useful references for the design of the connection.

中文翻译：

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无螺母高强螺栓与端板连接的拉伸性能

摘要 无螺母高强度螺栓安装方便，已广泛应用于拼装式轻钢组合房屋立柱与角件的连接。33个试件在静张力下进行试验，研究无螺母高强度螺栓与端板连接处的拉伸行为。本实验考虑的关键参数包括高强度螺栓直径、高强度螺栓材料特性、高强度螺栓长度、端板材料特性和端板厚度。根据测试结果对连接的拉伸行为和失效模式进行了评估和讨论。采用通用有限元软件ABAQUS建立三维非线性有限元模型(FEM)，并根据试验结果进行验证。抗拉能力和破坏模式与试验结果吻合较好，可采用有限元法对连接件的抗拉性能进行分析。影响连接抗拉能力的关键参数是螺栓的直径、材料特性和长度。而端板的厚度和材料特性影响较小。进一步推导了简化计算公式，建立了理论设计模型。通过将理论结果与试验结果进行比较来验证设计模型。这表明设计模型可以很好地预测连接的拉伸行为，