地铁荷载激励下变电站结构的振动响应与隔离研究

IF 0.7 Q4 ENGINEERING, MECHANICAL
Yong Liu, Tiantian Li, Lin Li, Zhengquan Cheng, Kunjie Rong, Li Tian
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引用次数: 0

摘要

本研究以毗邻高架桥地铁线的室内变电站为工程背景,通过现场测振研究地铁线运行诱发的变电站结构振动响应规律,提出一种新型非线性气弹簧准零刚度隔振器(NGS-QZSI),以减小结构垂直振动,进一步缩短安全距离。利用 ABAQUS 软件建立了考虑土-结构相互作用的结构-设备耦合数值分析模型,并根据实测结果验证了其有效性和准确性。对不同振源距离下的结构振动响应进行了分析,并提出了一种非线性气弹簧准零刚度隔振器用于变电站结构隔振。研究结果表明,地铁荷载激励下的变电站结构以竖向振动为主,其振动响应随楼层的增加而逐渐增大。当变电站结构距离地铁线小于 45 米时,结构响应超过了 VC-C 标准的安全限值(12.5 μm/s)。安装隔振器后,结构振动响应明显降低,峰值和均方根响应控制在 70% 以上。此外,频域结果分析表明,所提出的非线性隔振器可有效控制结构的低频振动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study on vibration response and isolation of substation structure under subway load excitation
This study takes the indoor substation adjacent to the elevated bridge subway line as the engineering background, investigates the structural vibration response law of the substation induced by the operation of the subway line through on-site vibration measurement, and proposes a novel nonlinear gas-spring quasi-zero stiffness isolator (NGS-QZSI) is proposed to reduce the structural vertical vibration and further reduce the safety distance. The software ABAQUS is used to establish a structure-equipment coupling numerical analysis model considering soil-structure interaction, and its effectiveness and accuracy are validated based on the measured results. The structural vibration response analysis is carried out under different vibration source distances, and a nonlinear gas-spring quasi-zero stiffness isolator is proposed to be employed for substation structural vibration isolation. The research results show that the substation structure under subway load excitation is dominated by vertical vibration, and its vibration response increases gradually with the increase of floor level. When the substation structure is less than 45 m from the subway line, the structural response exceeds the safety limit (12.5 μm/s) of the VC-C standard. With the vibration isolator attached, the structural vibration response is significantly reduced, with the peak and root mean square response controlled by more than 70 %. Particularly, the safe distance of the substation from the subway line is reduced from 45 m to 20 m. Moreover, the frequency domain result analysis indicates that the proposed nonlinear vibration isolator can effectively control the low-frequency vibration of the structure.
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来源期刊
Journal of Vibroengineering
Journal of Vibroengineering 工程技术-工程:机械
CiteScore
1.70
自引率
0.00%
发文量
97
审稿时长
4.5 months
期刊介绍: Journal of VIBROENGINEERING (JVE) ISSN 1392-8716 is a prestigious peer reviewed International Journal specializing in theoretical and practical aspects of Vibration Engineering. It is indexed in ESCI and other major databases. Published every 1.5 months (8 times yearly), the journal attracts attention from the International Engineering Community.
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