This study investigates the tensile properties of bolted connections for aluminum alloy plates from room temperature to 400 °C through elevated-temperature tensile tests of 30 single- and 24 multiple-bolted connections. Accordingly, the failure modes and tensile bearing capacity are defined at different temperatures. Then, ABAQUS is used to establish the finite element models of bolted connections for aluminum alloy plates at elevated temperatures, and the tests verified the rationality of finite element models. Considering the parameters such as thickness and width of plates, diameter and end distance of bolt holes, pretension force, and arrangements of bolts, the study performs a parametric analysis of connections and further examines the contribution of these parameters on tensile properties of bolted connection for aluminum alloy plates at elevated temperatures. This study employs a statistical regression method to derive the theoretical formula. Finally, it proposes a set of elevated-temperature reduction factors of ultimate bearing capacity suitable for aluminum alloy joints, which can serve as a guide in the analysis and design of fire resistance for aluminum alloy structures.

本研究通过对30个单螺栓连接和24个多螺栓连接的高温拉伸试验，研究了室温至400°C铝合金板的螺栓连接的拉伸性能。因此，在不同温度下定义了失效模式和拉伸承载能力。然后，利用ABAQUS建立了铝合金板高温螺栓连接的有限元模型，并通过试验验证了有限元模型的合理性。考虑以下参数：板的厚度和宽度，螺栓孔的直径和末端距离，预紧力以及螺栓的布置，这项研究对连接进行了参数分析，并进一步研究了这些参数对铝合金板在高温下螺栓连接的拉伸性能的影响。本研究采用统计回归方法得出理论公式。最后，提出了一套适用于铝合金接头的极限承载力升高的高温降低因子，可作为铝合金结构耐火性分析和设计的指导。