This paper presents the development and validation of moment-rotation backbone curve parameters for self-centering steel endplate connections with superelastic SMA bolts. In terms of influential design factors, surrogate models of response parameters are proposed using detailed finite element models of self-centering beam-column connections and statistical analysis of response parameters. The predictive surrogate models are useful for characterizing the connection backbone and self-centering response, which is essential for the performance-based design and assessment of extended endplate connections equipped with SMA bolts. Through a verification study, the accuracy of predictions using the proposed models is confirmed. The proposed surrogate models are used to assess the fragility of SMA-based beam-column connections. The results demonstrate that endplate beam-column connections with SMA bolts can provide an acceptable level of deformation capacity. Furthermore, it is found that larger diameter SMA bolts and smaller depth beam sections can reduce the probability of experiencing SMA bolt fracture by 31% and 77%, respectively.

本文介绍了用于使用超弹性 SMA 螺栓的自定心钢端板连接的力矩-旋转主干曲线参数的开发和验证。在影响设计因素方面，利用自定心梁柱连接的详细有限元模型和响应参数的统计分析，提出了响应参数的替代模型。预测替代模型可用于表征连接主干和自定心响应，这对于配备 SMA 螺栓的扩展端板连接的基于性能的设计和评估至关重要。通过验证研究，确认了使用所提出模型的预测的准确性。提议的替代模型用于评估基于 SMA 的梁柱连接的脆弱性。结果表明，采用 SMA 螺栓的端板梁柱连接可以提供可接受水平的变形能力。此外，发现较大直径的 SMA 螺栓和较小深度的梁截面可以分别将 SMA 螺栓断裂的概率降低 31% 和 77%。