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Experimental investigation on amplified multilayer viscoelastic damper and vibration mitigation evaluation subjected to wind loads
Journal of Building Engineering ( IF 6.4 ) Pub Date : 2023-06-02 , DOI: 10.1016/j.jobe.2023.106996
Feng Shang , Wenguang Liu , Hao Xu , Qiang Zhang

Methods to improve the damping efficiency of dampers have been extensively studied. This study proposes a multilayer viscoelastic damper with an amplified deformation device (MAVE), which combines a traditional viscoelastic damper (VE) with a lever amplification device. The proposed device utilizes multiple viscoelastic damping layers and a lever system to amplify the inter-story displacement, thereby increasing the damping force and enhancing energy dissipation capability. A mechanical model of MAVE was established, and model tests were performed to compare MAVE and VE. The test results demonstrate that MAVE can effectively amplify the deformation of the damper. The damping force of MAVE increased by 5.23 times, while the stiffness increased by 5.59 times, resulting in a 3.11 times increase in energy dissipation capacity. Furthermore, the deviations in the amplification factor and the comparisons between experimental and theoretical results were discussed. The experimental and theoretical deviations were within 10%. Finally, a numerical simulation was performed on a super-tall structure to demonstrate the vibration control capabilities of the MAVE system. By comparing the response of the structure and the energy consumption of the dampers, the vibration reduction efficiency of MAVE under wind loads was confirmed. The peak acceleration at the top floor was reduced by 51%, and the standard deviation (STD) acceleration was reduced by 37%. The peak displacement at the top floor was reduced by 80%, and the STD displacement of the same floor was reduced by 76%. MAVE effectively enhanced the comfort level of super-tall structures.



中文翻译:

风载放大多层粘弹性阻尼器实验研究及减振评价

已经广泛研究了提高阻尼器阻尼效率的方法。本研究提出了一种带有放大变形装置 (MAVE) 的多层粘弹性阻尼器,它将传统的粘弹性阻尼器 (VE) 与杠杆放大装置相结合。所提出的装置利用多个粘弹性阻尼层和杠杆系统来放大层间位移,从而增加阻尼力并增强能量耗散能力。建立了MAVE的力学模型,并进行了模型试验,对MAVE和VE进行了比较。试验结果表明MAVE可以有效地放大阻尼器的变形。MAVE的阻尼力提高了5.23倍,刚度提高了5.59倍,耗能能力提高了3.11倍。此外,讨论了放大系数的偏差以及实验和理论结果之间的比较。实验和理论偏差在 10% 以内。最后,对超高层结构进行了数值模拟,以展示MAVE系统的振动控制能力. 通过比较结构的响应和阻尼器的能量消耗,确定了MAVE在风荷载下的减振效率。顶层的峰值加速度降低了 51%,标准偏差 (STD) 加速度降低了 37%顶层峰值位移减少80%,同层STD位移减少76%。MAVE有效提升了超高层建筑的舒适度。

更新日期:2023-06-06
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