Application of the damage index method for plate-like structures to timber bridges

Samali, Bijan; Li, Jianchun; Choi, Fook Choon; Crews, Keith

doi:10.1002/stc.347

Cited by 17 publications

(13 citation statements)

References 14 publications

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“…This allows for a more robust damage index distribution, according to Equation , because every mode is affected differently by the local damage . Weak points are the number of required data points to accurately describe the mode shapes and the numerical errors introduced with the calculation of the second derivative . Although not extensively considered in this paper, many different publications address the problem of finding optimum positions of the measurement points.…”

Section: Damage Identification Proceduresmentioning

confidence: 99%

Impact damage identification in composite skin-stiffener structures based on modal curvatures

Ooijevaar

Warnet

Loendersloot

et al. 2015

Struct. Control Health Monit.

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Summary The feasibility of a vibration‐based damage identification approach for impact damage in two advanced composite skin‐stiffener structures is investigated in this paper. Mode shape curvatures combined with the modal strain energy damage index (MSE‐DI) algorithm are utilized to identify the damage. Special attention is paid to the effective application of this vibration‐based methodology by investigating the relation between the damage location, the structural design, and the dynamic behavior. The performance of a 1D and 2D formulation of the MSE‐DI algorithm is compared for several damage scenarios. Experiments demonstrated the capabilities of the MSE‐DI algorithm to detect, localize, and roughly quantify the size of barely visible impact damage in advanced composite structures. It is concluded that the method is particularly effective for health monitoring of skin‐stiffener connections. The most effective results were obtained by considering the 1D formulation in the direction of the stiffeners for the stiffener mid‐section and perpendicular to the stiffeners for the stiffener run‐out. The method remained inconclusive in the case of pure skin‐related damage. The results obtained in this study contribute to the development of guidelines for vibration‐based structural health monitoring of advanced composite skin‐stiffener structures. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Damage Identification Proceduresmentioning

confidence: 99%

Impact damage identification in composite skin-stiffener structures based on modal curvatures

Ooijevaar

Warnet

Loendersloot

et al. 2015

Struct. Control Health Monit.

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“…Samali et al [11] conducted a detailed study of a laboratory timber structure that consisted of four F11 radiata pine girders and an F11 structural plywood deck (4.5 m 9 2.4 m 9 0.1 m). Papatheou et al [12] investigated the feasibility of using known masses to guide feature extraction on an aluminum structure consisting of two C section ribs, two angle section stringers and a 3-mm-thick plate (0.75 m 9 0.5 m 9 0.05 m).…”

Section: Shm Of Laboratory Structuresmentioning

confidence: 99%

Structural Complexity in Structural Health Monitoring: Design of Laboratory Model and Test Plan

Cowled

Thambiratnam

Chan

et al. 2014

Lecture Notes in Mechanical Engineering

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Many researchers in the field of civil structural health monitoring (SHM) have developed and tested their methods on simple to moderately complex laboratory structures such as beams, plates, frames, and trusses. Fieldwork has also been conducted by many researchers and practitioners on more complex operating bridges. Most laboratory structures do not adequately replicate the complexity of truss bridges. Informed by a brief review of the literature, this paper documents the design and proposed test plan of a structurally complex laboratory bridge model that has been specifically designed for the purpose of SHM research. Preliminary results have been presented in the companion paper. IntroductionThe structural complexity of operational bridges poses a significant challenge for structural health monitoring (SHM) researchers. Reference [1] highlights that a 'primary source of epistemic uncertainty [in structural identification] is related to the relatively high level of structural complexity typical of constructed systems,' (p. 406). Ciloglu [2] found that structural complexity contributes significantly to the uncertainty of structural identification by operational modal analysis (OMA). Aktan et al. [3] argue that the basic assumptions that enable system identification of structures do not hold true for more complex constructed systems, particularly in a climate with daily temperature fluctuations of more than 10°C where temperature and humidity can have a significant effect on the vibration characteristics of an operational structure.

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“…Samali et al . presented a method for identifying damage in timber bridges using changes in modal strain energy between the undamaged and damaged states of plate‐like structures. Numerical and experimental techniques were used to test the method for detecting single and multiple damages.…”

Section: Vibration‐based Damage Assessmentmentioning

confidence: 99%

“…The effectiveness of the proposed method was demonstrated through numerical analysis and experimental testing of a simply supported bridge model with multiple girders. Samali et al [15] presented a method for identifying damage in timber bridges using changes in modal strain energy between the undamaged and damaged states of plate-like structures. Numerical and experimental techniques were used to test the method for detecting single and multiple damages.…”

Section: Vibration-based Damage Assessmentmentioning

confidence: 99%

Damage detection in slab-on-girder bridges using vibration characteristics

Shih

Thambiratnam

Chan

2012

Struct. Control Health Monit.

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This paper develops and applies a multi‐criteria procedure, incorporating changes in natural frequencies, modal flexibility and the modal strain energy, for damage detection in slab‐on‐girder bridges. The proposed procedure is first validated through experimental testing of a model bridge. Numerically simulated modal data obtained through finite element analyses are then used to evaluate the vibration parameters before and after damage and used as the indices for assessment of the state of structural health. The procedure is illustrated by its application to full scale slab‐on‐girder bridges under different damage scenarios involving single and multiple damages on the deck and girders. Copyright © 2012 John Wiley & Sons, Ltd.

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Application of the damage index method for plate-like structures to timber bridges

Cited by 17 publications

References 14 publications

Impact damage identification in composite skin-stiffener structures based on modal curvatures

Impact damage identification in composite skin-stiffener structures based on modal curvatures

Structural Complexity in Structural Health Monitoring: Design of Laboratory Model and Test Plan

Damage detection in slab-on-girder bridges using vibration characteristics

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