Investigation into vibration-based structural damage identification and amplitude-dependent damping ratio of reinforced concrete bridge deck slab under different loading states
Investigation into vibration-based structural damage identification and amplitude-dependent damping ratio of reinforced concrete bridge deck slab under different loading states
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不同荷载状态下钢筋混凝土桥面板振动结构损伤识别及幅相关阻尼比研究
DOI：
10.1007/s13349-022-00625-w
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发表时间：
2023
影响因子：
4.4
通讯作者：
S.
中科院分区：
文献类型：
--
作者：
Gohar;S.;Matsumoto;Y.;Maki;T.;Sakuma;S.
基于振动的结构健康监测（SHM）是基于这样一个事实，即结构的动态特性的变化与结构损伤。钢筋混凝土（RC）桥面板在使用过程中，由于疲劳和钢筋锈蚀等原因，经常会出现内部劣化和损伤，如水平裂缝等。由于钢筋混凝土板的内部劣化和损伤通常难以通过肉眼检测，因此通过基于振动的SHM来研究此类损伤。本文通过试验研究了水平裂缝和损伤对钢筋混凝土板模态特性的影响。采用特征系统实现算法和连续小波变换方法进行模态识别。建立了有限元模型，将实验模态特性与数值模态特性进行了比较。固有频率、模态阻尼比和协调模态保证准则的变化与损伤相关。通过考虑阻尼比的幅值依赖性，改善了阻尼比与损伤的相关性。研究了钢筋混凝土板的振幅阻尼特性，结果表明，在不同的加载状态下，振幅和阻尼比之间的相关性随振型和结构状态的变化而变化。
Vibration-based structural health monitoring (SHM) is based on the fact that changes in the dynamic characteristics of a structure are associated with structural damages. Deterioration in reinforced concrete (RC) bridge deck slabs is often observed during their service life due to fatigue and rebar corrosion leading to internal deterioration and damage, such as horizontal cracks. Since the internal deterioration and damage of RC slabs are often difficult to detect by visual inspection, a study was carried out to investigate such damages through vibration-based SHM. This study investigated experimentally the effect of horizontal crack and damage at different loading states, from 0 kN to load after failure, on the modal properties of RC slabs. Eigensystem realization algorithm and continuous wavelet transform approaches were adopted to identify the modal properties. Finite element model was developed to compare the experimental modal properties to the numerical ones. Changes in the natural frequency, modal damping ratio and coordinate modal assurance criteria were found to be correlated with damage. The correlation between damping ratio and damage was improved by considering the amplitude dependence of damping ratio. Investigation of amplitude-dependent damping behavior of RC slabs indicated variation in the slope of correlations between the amplitude and damping ratios with the vibration mode and structure condition in different loading states.
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