Traditional impedance-based bolt-looseness monitoring approaches using hand-crafted impedance features can lead to difficulties in quantitative damage severity estimation. In this study, a novel method for assessment with automated feature extraction is developed based on the integration of technique and deep learning algorithm. 1D CNN (1-dimensional convolutional neural network) – estimation models are designed automatically extract learn optimal from raw signals. The experimental...

In this study, we investigate a novel idea of using synthetic images bolts which are generated from graphical model to train deep learning for loosened bolt detection. Firstly, framework bolt-loosening detection image-based and computer graphics is proposed. Next, the feasibility proposed demonstrated through monitoring lab-scaled bolted joint model. For practicality, evaluated on real-scale connections historical truss bridge in Danang, Vietnam. The results show that trained by synthesized...

As an innovative technology, the impedance-based technique has been extensively studied for structural health monitoring (SHM) of various civil structures. The technique’s advantages include cost-effectiveness, ease implementation on a complex structure, robustness to early-stage failures, and real-time damage assessment capabilities. Nonetheless, very few studies have taken those status condition wind turbine Thus, this paper is motivated give reader general outlook how SHM technology...

For a structural health monitoring (SHM) system, the operational functionality of sensors is critical for successful implementation damage identification process. This study presents experimental and analytical investigations on sensor fault diagnosis impedance-based SHM using piezoelectric interface technique. Firstly, interface-based impedance experimentally conducted steel bolted connection to investigate effect defect electromechanical (EM) responses. Based analysis, diagnostic...

The piezoelectric-based smart strand technique could effectively monitor the prestress (PS) force in post-tensioned systems. In previous study, PS was predicted by supervised regression models where relationship between EMI feature and pre-determined through real-scale experiments. Nonetheless, obtaining response from an operating structure under damaged states is challenging costly. To solve this shortcoming, study proposes a simple alternative method to predict without conducting...

In this paper, solar-powered, multi-scale, vibration-impedance sensor node on Imote2 platform is presented for hybrid structural health monitoring (SHM) in cable-stayed bridge. order to achieve the objective, following approaches are proposed. Firstly, vibration- and impedance-based SHM methods briefly described. Secondly, multi-scale vibration impedance Imote2-platform design of hardware components embedded software SHM. approach, a solar-powered energy harvesting implemented autonomous...

In this paper, a vibration-based method to estimate prestress-forces in prestressed concrete (PSC) girder by using vibration characteristics and system identification (SID) approaches is presented. Firstly, prestress-force monitoring formulated the change prestress forces measuring modal parameters of PSC beam. Secondly, multi-phase SID scheme designed on basis eigenvalue sensitivity concept identify baseline model that represents target structure. Thirdly, proposed are evaluated from...

Hybrid acceleration-impedance sensor nodes on Imote2-platform are designed for damage monitoring in steel girder connections. Thus, the feasibility of is examined about its performance vibration-based global and impedance-based local structural systems. To achieve objective, following approaches implemented. First, a scheme described parallel with methods methods. Second, multi-scale that enable combined design hardware components embedded software to operate. Third, performances...

The bearing plate is an important part of a tendon–anchorage subsystem; however, its function and safety can be compromised by factors such as fatigue corrosion. This paper explores the feasibility electromechanical impedance (EMI) technique for crack detection in prestressed anchorage. Firstly, theory EMI presented. Next, well-established anchorage literature selected target structure. Thirdly, 3D finite element model PZT transducer–target subsystem simulated, consisting concrete segment,...

This study proposes a cost-effective prestress monitoring method for post-tensioned reinforced concrete (RC) beams using smart strand. Firstly, the concept of piezoelectric-based strand and its implementation force are developed. The is prepared by embedding inexpensive high-sensitivity electromechanical impedance (EMI) sensors in steel Next, feasibility proposed experimentally verified simple supported RC beam. A prototype fabricated embedded into 6.4 m beam which then prestressed with...

In this paper, system identification of a cable-stayed bridge in Korea, the Hwamyung Bridge, is performed using vibration responses measured by wireless sensor system. First, an acceleration based-wireless employed for structural health monitoring bridge, and nodes are deployed on deck, pylon several selected cables. Second, modal parameters obtained both from finite element (FE) analysis. Frequency domain decomposition stochastic subspace methods used to obtain responses. The FE model...

A multiscale wireless sensor system is designed for vibration- and impedance-based structural health monitoring. In order to achieve the objective, following approaches are implemented. Firstly, smart nodes vibration impedance monitoring designed. design, Imote2 platform which has high performance microcontroller, large amount of memory, flexible radio communication implemented acceleration nodes. Acceleration node modified measure PZT's dynamic strain along with acceleration. solar-power...

The piezoelectric-based smart interface technique has shown promising prospects for electro-mechanical impedance (EMI)-based damage detection with various successful applications. During the process of EMI monitoring and identification, operational functionality device is a major concern. In this study, common functional degradations that occurred in are diagnosed using deep learning-based method. Firstly, effect on responses analytically discussed. Secondly, critical structural joint...

This study presents a set of experimental and numerical investigations to the sensitivity piezoelectric-based smart interface device structural damage in bolted connection. The aims identify proper geometric sizes interfaces for detection tasks. First, fundamentals monitoring technique via lead zirconate titanate (PZT) is briefly described Second, lab-scaled girder connection selected as test structure investigation. PZT prototypes with varying are designed Under bolt-loosening inflicted...

Among vibration‐based damage detection methods, one of the effective approaches for localization is modal strain energy method. In this paper, method developed in plate‐like structures with various boundary conditions. Firstly, theory briefly outlined. order to overcome limitation measuring points, a central difference newly employed compute partial differential terms formula. Finite element analysis conducted on an aluminum thin plate obtain mode shapes before and after occurrence damage....

This study investigates the dynamic characteristics of a smart PZT interface mounted on prestressed anchorage to verify numerical feasibility admittance-based anchor force monitoring technique. Firstly, technique through single-mount is outlined. The admittance response interface-anchorage system theoretically derived show proof-of-concept for monitoring. Secondly, finite element model corresponding well-established experimental in literature constructed. effect equivalently treated by...

This paper presents an improvement to the modal strain energy (MSE) method for identifying structural damages in plate‐type structures. A two‐step MSE‐based damage localization procedure, including a global step and local step, is newly proposed enhance accuracy of detecting location damage. Firstly, uses mode shape data on whole plate locate potentially damaged areas. Then, MSE applied with more dense mesh size these areas detect detail. The procedure’s feasibility verified by analyzing...

In this paper, practical methods to utilize PZT's dual piezoelectric effects (i.e., dynamic strain and electro-mechanical (E/M) impedance responses) for damage detection in beam-type structures are presented. order achieve the objective, following approaches implemented. Firstly, PZT material's characteristics on E/M investigated. Secondly, global vibration-based local impedance-based detect occurrence location of Finally, using responses evaluated from experiments a lab-scaled beam several...

This study has been motivated to evaluate the practicality of numerical simulation impedance monitoring for damage detection in steel column connection. In order achieve objective, following approaches are implemented. Firstly, theory electro-mechanical (E/M) responses and impedance-based method outlined. Secondly, feasibility is verified several pre-published experimental examples on beams, cracked aluminum round plates. Undamaged damaged beams simulated compare responses. An plate with PZT...

The smart strand technique has been recently developed as a cost-effective prestress load monitoring solution for post-tensioned engineering systems. Nonetheless, during its lifetime under various operational and environmental conditions, the sensing element of potential to fail, threatening functionality resulting in inaccurate estimation. This study analyzes effect failures on impedance characteristics develops 1D convolutional neural network (1D CNN) automated fault diagnosis. Instead...

As a key load-bearing element in prestressed structure, the anchor should be appropriately monitored to secure its as-built prestressing force. In previous studies, impedance-based prestress force monitoring technique through mountable lead–Zirconate–Titanate (PZT) interface was developed. However, design of PZT uses two-point mount two bonding layers, causing inconveniences during installation and replacement processes. To address this issue, we propose an alternative model for based on...