Diagnostic analysis and dynamic identification of a glass suspension footbridge via on-site vibration experiments and FE numerical modelling

Bedon, Chiara

doi:10.1016/j.compstruct.2019.03.005

Cited by 56 publications

(62 citation statements)

References 23 publications

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“…It is important to stress how the choice of different structural systems, materials, and damage mechanisms for this methodology's validation is intended to show its reliability for novelty detection in a wide range of applications and conditions, as "damage" (in the broader sense possible) might manifest itself in many different ways, also depending on the specific constructional material [36], and these different occurrences may not be all similarly easy to detect-especially in larger structures with complicated geometries.…”

Section: Introductionmentioning

confidence: 99%

The Teager-Kaiser Energy Cepstral Coefficients as an Effective Structural Health Monitoring Tool

et al. 2019

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Recently, features and techniques from speech processing have started to gain increasing attention in the Structural Health Monitoring (SHM) community, in the context of vibration analysis. In particular, the Cepstral Coefficients (CCs) proved to be apt in discerning the response of a damaged structure with respect to a given undamaged baseline. Previous works relied on the Mel-Frequency Cepstral Coefficients (MFCCs). This approach, while efficient and still very common in applications, such as speech and speaker recognition, has been followed by other more advanced and competitive techniques for the same aims. The Teager-Kaiser Energy Cepstral Coefficients (TECCs) is one of these alternatives. These features are very closely related to MFCCs, but provide interesting and useful additional values, such as e.g., improved robustness with respect to noise. The goal of this paper is to introduce the use of TECCs for damage detection purposes, by highlighting their competitiveness with closely related features. Promising results from both numerical and experimental data were obtained.

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Section: Introductionmentioning

confidence: 99%

The Teager-Kaiser Energy Cepstral Coefficients as an Effective Structural Health Monitoring Tool

et al. 2019

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“…The reference modal shape was found to have the overall deformation of a beam, with the added contribution / uncertainty due to the "sandwich" cross-section (LG plate + top annealed layer) and to the steel tendon pairs. In this regard, an accurate Finite Element (FE) numerical model was implemented in ABAQUS [7,8], to account for the actual nominal geometrical and mechanical properties of the examined system, including a reliable description of boundaries. The dynamic parameters of the structure were numerically investigated via a wide set of parametric analyses, giving evidence -via sensitivity studies -of the influence of several key parameters, like the presence of bracing tendon pairs, their unilateral contact support, the level of pre-stress in the tendons and specifically the shear stiffness of PVB foils.…”

Section: Test Resultsmentioning

confidence: 99%

Vibration experiments for diagnostic investigations on a glass suspension footbridge

Bedon¹,

Bergamo²

2019

Vib. proced.

Self Cite

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Structural glass represents a relatively innovative and not well-known solution for constructions, where it is largely used for facades, roofs, footbridges, etc. There, multiple (sandwich) glass members can interact with traditional building materials, and should offer appropriate fail-safe performances, within the full life time. However, severe operational conditions, or extreme loads, can increase the intrinsic vulnerability glazing systems. In this paper, the dynamic characterization and damage diagnostic assessment of an existing glass footbridge is carried out, based on Operational Modal Analysis (OMA) techniques.

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“…Given that the stress verification is conservatively carried out with the reference t L , T L and G PVB input parameters from Table 7, a positive SLC check can be obtained (see also Figure 16b). From the same figures it can be seen that even small variations in the shear stiffness GPVB of the bonding foils (i.e., due to possible material degradation due to severe operational or ambient conditions, see also [62,63]) are expected to manifest in sensitive variations of predicted stresses, thus even in potential premature failure. As also previously discussed for Equation (6) and Table 7, careful consideration is also required for the tL characterization of seismic events (and thus GPVB assumptions), given that the dynamic response and shear stiffness of PVB foils is strongly sensitive to the vibration frequency, but also to testing procedures, thus requiring more sophisticated calculation methods (see for example [64][65][66]).…”

Section: Stress Verificationmentioning

confidence: 93%

Safety Issues in the Seismic Design of Secondary Frameless Glass Structures

Bedon

Amadio

Noè

2019

Safety

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Glass is largely used in buildings, in the form of an innovative and versatile material. Both for novel and existing constructions, secondary glass systems are frequently realized to interact with primary components of different materials. In most cases, the structural challenge deriving from the intrinsic brittleness and vulnerability of glass is efficiently controlled via laminated (LG) multi-layer sections. However, further potential risks for people should be properly minimized, like for example, in the presence of extreme loads. This is the case of seismic regions, where dedicated calculation methods are required to accommodate displacement and resistance demands, but design specifications are rarely provided by existing standards for earthquake resistant buildings. Even more attention is needed for frameless glass systems in which the bracing members (i.e., continuous frames, cable-nets, etc.,) are reduced to a minimum, in favour of metal point connections (i.e., bolts and mechanical fixings, friction clamps, etc.). This paper aims at discussing the current design requirements for the seismic performance assessment of these relatively simple but challenging structural solutions, with careful consideration for the Italian scenario, where a practical support for design can be found in the CNR-DT 210/2013 technical document. Based on a case-study system, major issues, open questions and uncertainties or critical aspects for the seismic analysis and design of secondary frameless glass assemblies are thus emphasized.

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Diagnostic analysis and dynamic identification of a glass suspension footbridge via on-site vibration experiments and FE numerical modelling

Cited by 56 publications

References 23 publications

The Teager-Kaiser Energy Cepstral Coefficients as an Effective Structural Health Monitoring Tool

The Teager-Kaiser Energy Cepstral Coefficients as an Effective Structural Health Monitoring Tool

Vibration experiments for diagnostic investigations on a glass suspension footbridge

Safety Issues in the Seismic Design of Secondary Frameless Glass Structures

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