基于地震预警信息的斜辊式隔震器阻尼力早期调节

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL
T. Hsu, Chih-Hua Huang, Shiang‐Jung Wang
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引用次数: 2

摘要

通过安装倾斜滚动式隔震器,可以有效而显著地降低在外界干扰下传递给被保护物体的水平加速度。为了防止SRI的最大水平位移响应达到阈值,可能需要为SRI设计较大且保守的阻尼力,这也会增大传递加速度响应。总之,当采用隔震时,最小化加速度或位移响应始终是一种权衡。因此,本文提出利用地震预警系统提供的可能信息,可以提前确定SRI所施加的阻尼力,从而更好地控制加速度和位移响应,并以半主动控制的方式进行相应的调整。利用大量峰值加速度不小于80 gal的地震动记录,数值计算结果表明,SRI的最大水平位移响应与输入激励的一些重要参数,特别是速度脉冲能量率和峰值速度高度相关并成正比。本文考虑采用双曲正切函数的基本形式和两个目标函数的控制律,从概念上发展合适的控制算法。与简单地设计一个恒定的大阻尼因子来防止SRI撞击的数值结果相比,采用推荐的控制算法在激励下的加速度响应平均降低60%以上。更重要的是,它在大约98%的激励下有效地减少了加速度响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Early adjusting damping force for sloped rolling-type seismic isolatorsbased on earthquake early warning information
By means of installing sloped rolling-type seismic isolators (SRI), the horizontal acceleration transmitted to the to-be-protected object above can be effectively and significantly reduced under external disturbance. To prevent the maximum horizontal displacement response of SRI from reaching a threshold, designing large and conservative damping force for SRI might be required, which will also enlarge the transmitted acceleration response. In a word, when adopting seismic isolation, minimizing acceleration or displacement responses is always a trade-off. Therefore, this paper proposes that by exploiting the possible information provided by an earthquake early warning system, the damping force applied to SRI which can better control both acceleration and displacement responses might be determined in advance and accordingly adjusted in a semi-active control manner. By using a large number of ground motion records with peak ground acceleration not less than 80 gal, the numerical results present that the maximum horizontal displacement response of SRI is highly correlated with and proportional to some important parameters of input excitations, the velocity pulse energy rate and peak velocity in particular. A control law employing the basic form of hyperbolic tangent function and two objective functions are considered in this study for conceptually developing suitable control algorithms. Compared with the numerical results of simply designing a constant, large damping factor to prevent SRI from pounding, adopting the recommended control algorithms can have more than 60% reduction of acceleration responses in average under the excitations. More importantly, it is effective in reducing acceleration responses under approximately 98% of the excitations.
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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