Development of a semi-active MR inerter for seismic protection of civil structures

IF 2.4 3区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shida Jin, Zexin Chen, Shuaishuai Sun, Lei Deng, Jian Yang, Haiping Du, Weihua Li
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引用次数: 0

Abstract

Civil engineering structures are susceptible to collapsing when exposed to severe vibrations. Therefore, it is essential to protect them from undesirable vibrations triggered by natural calamities like earthquakes or strong winds. This paper proposes an innovative semi-active Magnetorheological (MR) inerter system with a compact structure for seismic protection. The inerter system consists of four rubber bearings and the semi-active MR inerter. The inertance of the semi-active MR inerter can be switched according to different working scenarios. This unique operating principle enhances the adaptability of the system. To assess the performance of the proposed inerter system, a scaled three-storey building was constructed following scaling laws. Four scaled earthquake signals with different dominant frequencies were used as ground motion excitations. An inertance switch controller based on short-time Fourier transformation (STFT) methodology was built to determine the desired inertance of the inerter. Both the simulation and experimental results indicated that the proposed semi-active MR inerter system provides superior vibration mitigation capacity over the passive inerter systems. Specifically, the employment of the semi-active MR inerter effectively reduces the acceleration responses of the structures under different seismic excitations.
开发用于民用建筑抗震保护的半主动磁共振感应器
土木工程结构在受到剧烈振动时很容易倒塌。因此,必须保护它们免受地震或强风等自然灾害引发的不良振动的影响。本文提出了一种结构紧凑的创新型半主动磁流变(MR)抗震系统。惯性体系统由四个橡胶支座和半主动磁流变惯性体组成。半主动磁流变感应器的惰性可根据不同的工作情况进行切换。这种独特的工作原理增强了系统的适应性。为了评估所提议的电抗器系统的性能,我们按照比例定律建造了一座按比例缩放的三层建筑。四种具有不同主频的按比例地震信号被用作地面运动激励。基于短时傅立叶变换(STFT)方法建立了惰性开关控制器,以确定惰性器所需的惰性。仿真和实验结果均表明,与被动惰性系统相比,拟议的半主动磁共振惰性系统具有更出色的减震能力。具体来说,采用半主动磁共振消能器可有效降低结构在不同地震激励下的加速度响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Intelligent Material Systems and Structures
Journal of Intelligent Material Systems and Structures 工程技术-材料科学:综合
CiteScore
5.40
自引率
11.10%
发文量
126
审稿时长
4.7 months
期刊介绍: The Journal of Intelligent Materials Systems and Structures is an international peer-reviewed journal that publishes the highest quality original research reporting the results of experimental or theoretical work on any aspect of intelligent materials systems and/or structures research also called smart structure, smart materials, active materials, adaptive structures and adaptive materials.
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