Metallic yielding damper is widely utilized to improve the seismic resilience of steel moment-resisting frames. It is a kind of displacement-depended damper and may fail when the ultimate displacement is reached under strong earthquakes. Nevertheless, little research has considered the damper failure behavior in seismic loss assessment of damper-retrofitted steel frames. In this paper, three representative buildings, including a 3-story, 9-story and 20-story steel frame, are retrofitted by a high efficient bending-yield metallic damper. The damper is designed based on the stiffness and displacement demands, and able to keep normal working under maximum considered earthquakes. Numerical models of the retrofitted steel frames with and without considering damper failure are then built, and cyclic behavior of the damper element is validated through the experimental results. Subsequently, nonlinear dynamic analysis is performed to evaluate effectiveness of the design procedure, and incremental dynamic analysis (IDA) is conducted to discuss the effect of damper failure on structural seismic fragility. Combing with the obtained seismic fragility curves, the effect of damper failure on the seismic losses of steel moment-resisting frames are quantitatively assessed using a story-based loss estimation methodology. The results show that the employed damper can effectively mitigate dynamic responses of low-, mid- and high-rise frames; the effect of damper failure on IDA curves is significant at relatively large seismic intensity, especially for the high-rise frame; ignoring the damper failure would lead to significant underestimation of collapse and demolition probability; the models without considering damper failure present higher expected total losses, and the damper failure has few effects on the expected annual losses.

金属屈服阻尼器被广泛用于提高钢制抗弯框架的抗震能力。它是一种依赖位移的阻尼器，在强地震下达到极限位移时可能会失效。然而，很少有研究在减振器改造钢框架的地震损失评估中考虑减振器失效行为。在本文中，3 层、9 层和20 层钢框架等3 座代表性建筑采用高效弯曲屈服金属阻尼器进行改造。阻尼器是根据刚度和位移要求设计的，能够在最大考虑的地震下保持正常工作。然后建立考虑和不考虑阻尼器失效的改造钢框架的数值模型，通过实验结果验证了阻尼元件的循环行为。随后，进行非线性动力分析以评估设计程序的有效性，并进行增量动力分析（IDA）以讨论阻尼器失效对结构地震脆性的影响。结合获得的地震易损性曲线，使用基于楼层的损失估计方法定量评估阻尼器失效对钢抗弯框架地震损失的影响。结果表明，所采用的阻尼器能有效缓解低、中、高层框架的动力响应；阻尼器失效对IDA曲线的影响在地震烈度较大时尤为显着，尤其是高层框架；忽视阻尼器失效会导致严重低估倒塌和拆除概率；不考虑阻尼器失效的模型表现出较高的预期总损失，阻尼器失效对预期年损失的影响很小。