Mechanical properties and restoring force model of Squeezing Rub-type Particle Damper

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2024-10-25 DOI:10.1016/j.istruc.2024.107421

Dan Ye , Jianting Zhou , Lueqin Xu , Ruijie Zhang , Shuangshuang Jin , Yangqing Liu , Jun Yang

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引用次数: 0

Abstract

The sliding effect of isolation bearings has been proven to effectively mitigate the seismic effects on large-span bridges. However, it also results in excessive relative displacement between the main girder and piers during earthquakes. In this study, a pioneering Squeezing Rub-type Particle Damper (SRPD) is developed to address this issue. In order to verify the damping characteristics of SRPDs and investigate the working principle of squeezing friction energy dissipation, five quasi-static tests were conducted on SRPDs using two particle damping materials with different compactness levels. In order to compare the energy dissipation performance, comparative tests were conducted on Non-Squeezing-type Particle Dampers (NSPDs) and SRPDs. Utilizing regression analysis, two skeletal curve models for SRPDs were proposed, alongside a detailed restoring force model that incorporates considerations for both the pinching effect and stiffness degradation phenomena observed during the loading and unloading phases. The experimental results demonstrate that the maximum damping force of SRPDs can reach 16 times that of NSPDs, and the energy dissipation of each loading cycle can reach 21.06 times that of NSPDs. SRPDs exhibits improved energy dissipation performance when using high-density blended quartz sand. After sand replenishment repairs,damping force and energy dissipation per cycle of SRPDs were significantly enhanced. The proposed restoring force models of SRPDs aligns well with the experimental curves, underscoring its efficacy in accurately characterizing the hysteresis performance of SRPDs.

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挤压摩擦型颗粒阻尼器的机械特性和恢复力模型

事实证明，隔震支座的滑动效应可有效减轻大跨度桥梁的地震影响。然而，它也会导致地震时主梁和桥墩之间产生过大的相对位移。在本研究中，针对这一问题开发了一种开创性的挤压摩擦型颗粒阻尼器（SRPD）。为了验证 SRPD 的阻尼特性并研究挤压摩擦消能的工作原理，使用两种不同密实度的颗粒阻尼材料对 SRPD 进行了五次准静力试验。为了比较能量耗散性能，对非挤压型颗粒阻尼器（NSPD）和 SRPD 进行了对比试验。通过回归分析，提出了 SRPD 的两个骨架曲线模型，以及一个详细的恢复力模型，该模型考虑了加载和卸载阶段观察到的挤压效应和刚度衰减现象。实验结果表明，SRPD 的最大阻尼力可达 NSPD 的 16 倍，每个加载周期的能量耗散可达 NSPD 的 21.06 倍。当使用高密度混合石英砂时，SRPDs 的消能性能得到改善。经过补砂修复后，SRPD 的阻尼力和每个循环的能量耗散都得到了显著提高。所提出的 SRPD 恢复力模型与实验曲线非常吻合，表明其在准确表征 SRPD 的滞后性能方面非常有效。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.