Effect of Bidirectional Ground Motion on the Response of Double Concave Friction Pendulum Systems

IF 4.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Jiaxi Li, Ping Tan, Kui Yang, Haowen Zheng, Shinsuke Yamazaki, Shoichi Kishiki
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Abstract

Recent destructions of structures due to insufficient isolator deformation capacity have led to demands for greater seismic redundancy in seismic isolation design. For a friction pendulum system (FPS), the effect of bidirectional behavior of earthquakes on the maximum response and its effect on friction heating, temperature, and in turn on the maximum response can be significant. However, the extent of these effects under different FPS design parameters and different types of ground motions (GMs) is still not clear. In this study, an analytical model of double concave FPS considering the coupling effect of friction heating and bidirectional behavior was proposed and validated by bidirectional earthquake response orbits, which reflect the characteristics of both GMs and FPSs. Then, the effects of bidirectional GM and corresponding bidirectional temperature change on the response were investigated under different types of strong GMs. Finally, a performance-based design method with a bidirectional-effect-compensation mechanism was proposed. For double concave friction pendulum bearings with PTFE-related layers, it was found that the bidirectional behavior of earthquakes will amplify the maximum isolator displacement by an average of 110–210% (60 MPa) and the maximum superstructure acceleration by an average of 100–140% (60 MPa) under strong GMs (PGV-C1 > 0.2 m/s) and optimum design parameters. The amplification ratio is not only influenced by GM characteristics but also highly related to the design parameters and friction-heating effect of DCFPS.

Abstract Image

双向地面运动对双凹摩擦摆系统响应的影响
最近由于隔震装置变形能力不足而造成的结构破坏,促使人们要求在隔震设计中增加抗震冗余。对于摩擦摆系统(FPS)来说,地震的双向行为对最大响应的影响及其对摩擦加热、温度的影响,进而对最大响应的影响可能是显著的。然而,在不同的 FPS 设计参数和不同类型的地面运动(GMs)下,这些影响的程度仍不明确。本研究提出了考虑摩擦加热和双向行为耦合效应的双凹面 FPS 分析模型,并通过双向地震响应轨道进行了验证。然后,研究了不同类型强 GM 下双向 GM 和相应双向温度变化对响应的影响。最后,提出了一种具有双向效应补偿机制的基于性能的设计方法。对于带有聚四氟乙烯相关层的双凹摩擦摆式支座,研究发现,在强 GM(PGV-C1 > 0.2 m/s)和最佳设计参数下,地震的双向行为将使最大隔震器位移平均放大 110-210% (60 MPa),最大上部结构加速度平均放大 100-140% (60 MPa)。放大率不仅受 GM 特性的影响,还与 DCFPS 的设计参数和摩擦热效应密切相关。
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来源期刊
Structural Control & Health Monitoring
Structural Control & Health Monitoring 工程技术-工程:土木
CiteScore
9.50
自引率
13.00%
发文量
234
审稿时长
8 months
期刊介绍: The Journal Structural Control and Health Monitoring encompasses all theoretical and technological aspects of structural control, structural health monitoring theory and smart materials and structures. The journal focuses on aerospace, civil, infrastructure and mechanical engineering applications. Original contributions based on analytical, computational and experimental methods are solicited in three main areas: monitoring, control, and smart materials and structures, covering subjects such as system identification, health monitoring, health diagnostics, multi-functional materials, signal processing, sensor technology, passive, active and semi active control schemes and implementations, shape memory alloys, piezoelectrics and mechatronics. Also of interest are actuator design, dynamic systems, dynamic stability, artificial intelligence tools, data acquisition, wireless communications, measurements, MEMS/NEMS sensors for local damage detection, optical fibre sensors for health monitoring, remote control of monitoring systems, sensor-logger combinations for mobile applications, corrosion sensors, scour indicators and experimental techniques.
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