Structural Condition Assessment — An Introduction

Ratay, Robert T.

doi:10.1061/40889(201)106

Cited by 16 publications

(14 citation statements)

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“…No mistakes were found through the global review of the design, the analyses or any visible imperfections of the structure of the individual projects [4]. That means that there were no obvious reasons to doubt about the structural safety of the individuals projects .…”

Section: In Mindmentioning

confidence: 97%

Evaluation of the Risk Management of Structural Safety in 15 Building Projects

Mans¹,

Rings²,

Brand³

et al. 2009

IABSE Symposium, Bangkok 2009: Sustainable Infrastructure - Environment Friendly, Safe and Resource Efficient

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This paper presents results of a research towards risks in design and building processes with respect to structural safety in contemporary building projects. 15 almost or just finished building projects with different functionalities and different clients were subject of the research. Different ways of cooperation (traditional, design & construct, building team, turn key) were represented. After document reviews, interviews and site visit with visual inspection, for each project a report with the main facts of the organization of the process, the structural design, costs and fees and interventions related to structural safety was written and verified by the client's project manager. A risk table was developed in which for each stage of the project risks are distinguished that could lead to the top risk: lack of structural safety. The individual building projects were evaluated. In 12 of the 15 projects interventions related to structural safety occurred. These led to modifications or strengthening of already executed structures. Assessment of the risks and the way these risks were controlled result in an appraisal of the proof of structural safety and the level of risk control. It is concluded that parties in an individual building project do not always have the same view of structural safety, that in most projects no specific decisions are made about the level of structural safety and that the type of contract seems to have no relation with the level of risk control.

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Section: In Mindmentioning

confidence: 97%

Evaluation of the Risk Management of Structural Safety in 15 Building Projects

Mans¹,

Rings²,

Brand³

et al. 2009

IABSE Symposium, Bangkok 2009: Sustainable Infrastructure - Environment Friendly, Safe and Resource Efficient

View full text Add to dashboard Cite

show abstract

“…Methods in the first group require a full-field measurement method/tool (e.g., Moire interferometry, digital shearography, scanning laser vibrometers, and camera-based motion measurement), and they process the measured displacement, slope, or velocity field to compute curvatures and/or strains and then locate damage by examining abnormality or sudden change of these spatially distributed data. 4,7,8 Methods in the second group require simultaneous measurements of many points, and a well-calibrated structural model and a modal expansion/update method are used to locate damage. 5,9 Methods in the third group require simultaneous measurements of only a few locations, process the measured points' time traces to extract dynamic characteristics (i.e., natural frequencies, damping ratios, wave propagation characters, and nonlinear effects) to reveal the existence of damage, and use the traveling sequence of abnormality to locate damage.…”

Section: Introductionmentioning

confidence: 99%

Time-frequency and space-wavenumber analysis for damage inspection of thin-walled structures

Pai

Sundaresan

2011

SPIE Proceedings

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This paper presents a dynamics-based methodology for accurate damage inspection of thin-walled structures by combining a boundary-effect evaluation method (BEEM) for space-wavenumber analysis of measured operational deflection shapes (ODSs) and a conjugate-pair decomposition (CPD) method for time-frequency analysis of time traces of measured points. BEEM is for locating and estimating small structural damage by processing ODSs measured by a full-field measurement system (e.g., a scanning laser vibrometer or a camera-based motion measurement system). BEEM is a nondestructive spatial-domain method based on area-by-area processing of ODSs and it works without using any structural model or historical data for comparison. Similar to the short-time Fourier transform and wavelet transform, CPD uses adaptive windowed regular harmonics and function orthogonality to perform time-frequency analysis of time traces by extracting time-localized regular and/or distorted harmonics. Both BEEM and CPD are local spectral analysis based on local, adaptive curve fitting. The first estimation of the wavenumber for BEEM and the frequency for CPD is obtained by using a four-point Teager-Kaiser algorithm based on the use of finite difference. Numerical simulations and experimental results show that the combination of BEEM and CPD for space-wavenumber and time-frequency analysis provides an accurate tool for damage inspection of thin-walled structures.

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“…[1][2][3][4][5][6][7][8] Nonlinearities can be due to large elastic deformations (i.e. geometric nonlinearity), deformation-dependent material properties (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…For several decades, structural engineers have been developing dynamics-based methods for rapid damage inspection of large thin-walled structures. [1][2][3][4][5][6] Dynamics-based damage detection methods can be separated into three groups based on the complexity of sensor systems and signal processing methods. Methods in the first group require a full-field measurement method/tool (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Moire interferometry, digital shearography, scanning laser vibrometers, and camera-based motion measurement), and they process the measured displacement, slope, or velocity field to compute curvatures and/or strains and then locate damage by examining abnormality or sudden change of these spatially distributed data. 4,7,8 Methods in the second group require simultaneous measurements of many points, and a well-calibrated structural model and a modal expansion/update method are used to locate damage. 5,9 Methods in the third group require simultaneous measurements of only a few locations, process the measurement points' time traces to extract dynamic characteristics (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Space–wavenumber and time–frequency analysis for damage inspection of thin-walled structures

Pai

Sundaresan

2012

Structural Health Monitoring

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This article presents a dynamics-based methodology for accurate damage inspection of thin-walled structures by combining a boundary effect evaluation method (BEEM) for space-wavenumber analysis of measured operational deflection shapes (ODSs) and a conjugate-pair decomposition (CPD) method for time-frequency analysis of time traces of measured points. BEEM is for locating and estimating small structural damages by processing ODSs measured by a full-field measurement system (e.g. a scanning laser vibrometer or a camera-based motion measurement system). BEEM is a nondestructive spatial domain method based on sliding-window processing of ODSs, and it works without using any structural model or historical data for comparison. Similar to the short-time Fourier transform and wavelet transform, CPD uses adaptive windowed regular harmonics and function orthogonality to perform time-frequency analysis of time traces by extracting time-localized regular and/or distorted harmonics. Both BEEM and CPD are local spectral analyses based on local, adaptive curve fitting. The first estimation of the wavenumber for BEEM and the frequency for CPD is obtained using a four-point Teager-Kaiser algorithm based on the use of finite difference. Numerical simulations and experimental results show that the combination of BEEM and CPD for space-wavenumber and time-frequency analyses provide an accurate tool for damage inspection of thin-walled structures.

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Structural Condition Assessment — An Introduction

Cited by 16 publications

References 0 publications

Evaluation of the Risk Management of Structural Safety in 15 Building Projects

Evaluation of the Risk Management of Structural Safety in 15 Building Projects

Time-frequency and space-wavenumber analysis for damage inspection of thin-walled structures

Space–wavenumber and time–frequency analysis for damage inspection of thin-walled structures

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