Abstract The fundamental objective of this research is to investigate the performance of a self-centering tension-only brace beyond its ultimate level. This goal is undertaken by proposing an optimized mechanism to minimize the over-strength factor and maximize the displacement capacity of the system and to experimentally verify this. The proposed mechanism is called secondary-fuse. The investigated tension-only bracing system employs Resilient Slip Friction Joint (RSFJ) at the end(s) of diagonal members to provide self-centering, ductility, and damping with a flag-shape response. Analytical relations are also proposed in conjunction with the experimental results to predict the response. Furthermore, this study presents and discusses the relevant design over-strength factors. Firstly, the over-strength mechanism of the devices is verified through joint component testing. In the next step, the same joints are used in a full-scale two-dimensional steel frame to investigate their behavior on the frame level. The frame is capacity designed in a way that the weak link of the system is RSFJ. Then it is tested under quasi-static loading regime. Based on the test results, the displacement elongation and over-strength factor of three joints, as well as the frame, are given. The parameters affecting the joint elongation are also discussed. To conclude, the test results confirmed that the proposed secondary fuse could well provide the displacement ductility beyond the RSFJ ultimate level while keeping the system self-centered, however, the rods should be replaced after a major event during which the secondary-fuse is activated.

中文翻译：

---

超出极限水平的弹性滑动摩擦接头仅受拉支撑

摘要 本研究的基本目标是调查自定心张力支撑超出其极限水平的性能。该目标是通过提出一种优化机制来实现的，以最小化超强度因素并最大化系统的位移能力，并通过实验验证这一点。所提出的机制称为二次熔断器。所研究的仅受拉支撑系统在对角构件的末端采用弹性滑动摩擦接头 (RSFJ)，以提供自定心、延展性和阻尼，并具有旗形响应。还结合实验结果提出了分析关系以预测响应。此外，本研究提出并讨论了相关的设计超强度因素。首先，通过联合部件测试验证了装置的超强度机制。在下一步中，在全尺寸二维钢框架中使用相同的节点来研究它们在框架级别上的行为。框架是容量设计的，系统的薄弱环节是RSFJ。然后在准静态加载状态下进行测试。根据试验结果，给出了三个节点以及框架的位移伸长率和超强系数。还讨论了影响接头伸长率的参数。总而言之，测试结果证实，所提出的二次熔断器可以很好地提供超过 RSFJ 极限水平的位移延展性，同时保持系统自定心，但是，在二次熔断器被激活的重大事件后，应更换杆.