Analysis and validation of theoretical equations for a seismic isolation system with a multi-level friction damper

IF 3.6 2区 工程技术 Q1 ENGINEERING, CIVIL
Chia-Shang Chang Chien, Lyan-Ywan Lu, Shan-Ru Chen, Mei-Ting Guo
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Abstract

Traditional seismic isolation structures perform poorly due to the impact of velocity pulses from near-field seismic waves. A conical friction pendulum isolator (CFPI) is a variable-curvature seismic isolation system, which can mitigate the resonance effect produced in seismic isolation structures by the velocity pulses of long-period near-field seismic waves. A multi-level friction damper (MFD) has a multistage energy dissipation mechanism and has been proven to have excellent shock absorption effects in structures for earthquakes of different intensities. Therefore, the present study integrated an MFD into a CFPI to develop a seismic isolation system (CFPI + MFD system) with improved safety under near-field seismic waves. Theoretical equations were established for this system to enable numerical simulation analysis. According to the results of numerical simulation analysis, the designed CFPI + MFD system has an excellent seismic isolation effect, whether under near-field seismic waves or large earthquakes. To verify the accuracy of the numerical simulation results, this study performed a shaking table test for a single-degree-of-freedom (SDOF) structure with the designed seismic isolation system. Experimental data derived from the shaking table test and the results of numerical simulation analysis were used to conduct fitting of the superstructure acceleration, base sliding displacement, and hysteresis loop data. The fitting results indicated that the numerical and experimental superstructure acceleration, base sliding displacement, and hysteresis loops exhibited a good fit, which validated the accuracy of the theoretical equations formulated in this study.

Abstract Image

多级摩擦阻尼器隔震系统理论方程的分析与验证
由于受到近场地震波速度脉冲的影响,传统的隔震结构性能较差。锥形摩擦摆隔震器 (CFPI) 是一种变曲率隔震系统,可减轻长周期近场地震波速度脉冲对隔震结构产生的共振效应。多级摩擦阻尼器(MFD)具有多级消能机制,在不同烈度的地震中被证明对结构具有良好的减震效果。因此,本研究将多级摩擦阻尼器集成到 CFPI 中,开发出一种在近场地震波下安全性更高的隔震系统(CFPI + MFD 系统)。为该系统建立了理论方程,以便进行数值模拟分析。根据数值模拟分析的结果,所设计的 CFPI + MFD 系统无论是在近场地震波还是大地震下都具有极佳的隔震效果。为了验证数值模拟结果的准确性,本研究对采用所设计隔震系统的单自由度(SDOF)结构进行了振动台试验。利用振动台试验得出的实验数据和数值模拟分析结果,对上部结构加速度、基座滑动位移和滞后环数据进行了拟合。拟合结果表明,上部结构加速度、底座滑动位移和滞后环的数值拟合与实验拟合效果良好,验证了本研究制定的理论方程的准确性。
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来源期刊
Journal of Civil Structural Health Monitoring
Journal of Civil Structural Health Monitoring Engineering-Safety, Risk, Reliability and Quality
CiteScore
8.10
自引率
11.40%
发文量
105
期刊介绍: The Journal of Civil Structural Health Monitoring (JCSHM) publishes articles to advance the understanding and the application of health monitoring methods for the condition assessment and management of civil infrastructure systems. JCSHM serves as a focal point for sharing knowledge and experience in technologies impacting the discipline of Civionics and Civil Structural Health Monitoring, especially in terms of load capacity ratings and service life estimation.
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