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Seismic performance assessment of steel strip dampers equipped in high-rise steel frame
Journal of Constructional Steel Research ( IF 4.1 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.jcsr.2020.106437
Zhipeng Zhai , Wei Guo , Zhiwu Yu , Yao Hu , Chenzhi Ma

Abstract This paper aims to utilize a novel steel strip damper to enhance seismic resilience of high-rise steel frame in high seismic intensity regions. The developed damper is composed of external casing, internal casing and steel strip fuses dissipating seismic energy via bending-dominated deformation throughout the entire section, which is convenient for post-earthquake replacement. A series of cyclic loading tests have shown the damper's good energy dissipation capacity with features of stable and full hysteretic loops. A numerical model for the damper is proposed and validated by the experimental results. Then a 20-story steel frame is adopted as the representative building and retrofitted using a design procedure based on the stiffness and displacement demands. Nonlinear dynamic analysis considering damper failure is performed to evaluate seismic responses of the steel frames. And incremental dynamic analysis is employed to discuss the seismic fragility. Finally, seismic losses of the steel frames are assessed through the story-based loss estimation method in which the demolition-related economic losses are included. The analyses indicate that the presented damper can obviously mitigate the roof displacement, inter-story drift, plastic damage and soft story deformation mechanism; the damper-fused frame has much lower probability to collapse; the expected total losses, expected annual losses and expected life-cycle losses are significantly decreased by retrofitting with the novel dampers.

中文翻译:

高层钢架钢带阻尼器抗震性能评价

摘要 本文旨在利用一种新型钢带阻尼器提高高地震烈度地区高层钢框架的抗震能力。研制的阻尼器由外套管、内套管和钢带保险丝组成,整个断面以弯曲为主的变形消散地震能量,便于震后更换。一系列循环加载试验表明,该阻尼器具有良好的耗能能力,具有稳定和全滞回回路的特点。提出了阻尼器的数值模型,并通过实验结果进行了验证。然后采用20层钢框架作为代表性建筑,并根据刚度和位移要求采用设计程序进行改造。进行考虑阻尼器失效的非线性动力分析以评估钢框架的地震响应。并采用增量动力分析法讨论地震易损性。最后,钢框架的地震损失通过基于楼层的损失估算方法进行评估,其中包括与拆除相关的经济损失。分析表明,所提出的阻尼器能明显减轻屋顶位移、层间漂移、塑性损伤和软层变形机制;阻尼融合框架倒塌的可能性要低得多;通过采用新型阻尼器进行改造,预期总损失、预期年损失和预期生命周期损失显着降低。最后,钢框架的地震损失通过基于楼层的损失估算方法进行评估,其中包括与拆除相关的经济损失。分析表明,所提出的阻尼器可以明显减轻屋顶位移、层间漂移、塑性损伤和软层变形机制;阻尼融合框架倒塌的可能性要低得多;通过采用新型阻尼器进行改造,预期总损失、预期年损失和预期生命周期损失显着降低。最后,钢框架的地震损失通过基于楼层的损失估算方法进行评估,其中包括与拆除相关的经济损失。分析表明,所提出的阻尼器能明显减轻屋顶位移、层间漂移、塑性损伤和软层变形机制;阻尼融合框架倒塌的可能性要低得多;通过使用新型阻尼器进行改造,预期总损失、预期年损失和预期生命周期损失显着降低。塑性破坏和软层变形机制;阻尼融合框架倒塌的可能性要低得多;通过使用新型阻尼器进行改造,预期总损失、预期年损失和预期生命周期损失显着降低。塑性破坏和软层变形机制;阻尼融合框架倒塌的可能性要低得多;通过采用新型阻尼器进行改造,预期总损失、预期年损失和预期生命周期损失显着降低。
更新日期:2021-02-01
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