Experimental Study on the Damping Ratio Evaluation of a Cable-Stayed Bridge Based on Damping Dissipation Function

IF 4.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Structural Control & Health Monitoring Pub Date : 2025-03-15 DOI:10.1155/stc/5810450
Fengzong Gong, Cheng Pan, Ye Xia
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Abstract

Damping ratio is a fundamental dynamic parameter of the structure. Recent monitoring of cable-stayed bridges has shown that the damping ratio changes under different operating conditions. In general, the damping ratio of a structure can only be evaluated after the structure is built, and it is still challenging to theoretically calculate the damping ratio of a structure beforehand. To further understand the mechanism of the bridge damping ratio, this paper proposes an evaluation method based on the damping dissipation function. The effects of the initial and modal strain energy of the structure on the damping dissipation are considered. The damping dissipation function of substructures of a laboratory cable-stayed bridge model was tested, and the structural system damping ratio was evaluated. Furthermore, the theoretical discussion and experimental verification of the effect of support friction on the damping ratio were conducted. The results indicate that the damping ratio of the substructure varies with both the vibration amplitude and the initial stress level. Consideration of the initial strain energy during testing the substructure damping dissipation function can lead to more accurate results in the evaluation of the damping ratio of the structural system. In addition, support friction also significantly influences the damping ratio of the longitudinal drift and vertical bending modes of the structure.

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阻尼比是结构的基本动态参数。最近对斜拉桥的监测表明,阻尼比在不同的运行条件下会发生变化。一般来说,结构的阻尼比只能在结构建成后才能进行评估,而事先对结构的阻尼比进行理论计算仍具有挑战性。为了进一步了解桥梁阻尼比的机理,本文提出了一种基于阻尼耗散函数的评估方法。考虑了结构的初始应变能和模态应变能对阻尼耗散的影响。测试了实验室斜拉桥模型下部结构的阻尼耗散函数,并评估了结构系统阻尼比。此外,还对支撑摩擦对阻尼比的影响进行了理论讨论和实验验证。结果表明,下部结构的阻尼比随振动振幅和初始应力水平而变化。在测试下部结构阻尼耗散函数时考虑初始应变能,可使结构系统阻尼比的评估结果更加准确。此外,支撑摩擦也会对结构纵向漂移和垂直弯曲模式的阻尼比产生重大影响。
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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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