Integrity assessment of masonry arch bridges using the dynamic stiffness technique

Armstrong, D. M.; Sibbald, A. R.; Forde, M. C.

doi:10.1016/0963-8695(95)00047-x

Cited by 19 publications

(9 citation statements)

References 1 publication

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“…The frequency variations can potentially be attributed to the perturbation introduced by the presence of a hammer operator. In contrast with earlier, successful studies (see for instance [4,10]) that correlated damage with reduction in natural frequencies, the modal properties associated with lowerfrequency global modes of the Minster vaults are observed to be insensitive to the existence of wall-vault separation. Table 3 also includes a correlation metric used to compare the mode shapes of the two prototype vaults.…”

Section: Evaluation In the Modal Domaincontrasting

confidence: 65%

“…The authors had success in relating the deviations in modal parameters obtained from the two scaled arch bridge models to their structural condition. Armstrong et al [4] obtained consistent results when a similar study was performed on the scaled arch bridge models that focused on the dynamic stiffness instead of modal parameters. These two successful studies suggest that vibration measurements are a viable monitoring tool for detecting spandrel wall separation in existing masonry arch bridges.…”

Section: Introductionsupporting

confidence: 52%

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Vibration characteristics of vaulted masonry monuments undergoing differential support settlement

Atamturktur

Bornn

Hemez

2011

Engineering Structures

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Section: Evaluation In the Modal Domaincontrasting

confidence: 65%

Section: Introductionsupporting

confidence: 52%

Vibration characteristics of vaulted masonry monuments undergoing differential support settlement

Atamturktur

Bornn

Hemez

2011

Engineering Structures

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“…The authors were able to relate the deviations between natural frequencies and the mode shapes to the structural condition of the arch bridges. Armstrong et al (1995b) also compared the dynamic stiffness of the structurally sound and defective scaled models to detect spandrel wall separation. Both of these studies concluded that dynamic experiments can be used for integrity assessment of existing masonry arch bridges, specifically for spandrel wall separation.…”

Section: Scaled Laboratory Modelsmentioning

confidence: 99%

Calibration under uncertainty for finite element models of masonry monuments

Atamturktur¹,

Hemez²,

Unal³

2010

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About the Cover:The figures on the cover illustrate three aspects of the validation of a computational model developed to predict the vibration response of historic masonry monuments. Top right: The National Cathedral, Washington, DC, where vibration response of vaults is experimentally measured to assess the effect of structural damage. The measurements provide acceleration time series used to verify and validate predictions of the numerical simulation. Top left: The computational finite element model is shown to illustrate the mesh discretization of a vault. The model is analyzed to simulate the vibration response. Colors represent different material properties whose uncertainties are propagated through the calculation. Bottom: The measurement of a vibration mode shape of the structure (solid line) is compared to the prediction of the finite element model (dashed line). Crosses illustrate the uncertainty of predictions due to variability of the boundary conditions and material properties. Statistical tests are implemented to quantify the accuracy of the finite element model, given measurement variability and prediction uncertainty. Tables Table 3- Calibration Under Uncertainty for Finite List of Figures List of ABSTRACTHistorical unreinforced masonry buildings often include features such as load bearing unreinforced masonry vaults and their supporting framework of piers, fill, buttresses, and walls. The masonry vaults of such buildings are among the most vulnerable structural components and certainly among the most challenging to analyze. The versatility of finite element (FE) analyses in incorporating various constitutive laws, as well as practically all geometric configurations, has resulted in the widespread use of the FE method for the analysis of complex unreinforced masonry structures over the last three decades. However, an FE model is only as accurate as its input parameters, and there are two fundamental challenges while defining FE model input parameters: (1) material properties and (2) support conditions. The difficulties in defining these two aspects of the FE model arise from the lack of knowledge in the common engineering understanding of masonry behavior. As a result, engineers are unable to define these FE model input parameters with certainty, and, inevitably, uncertainties are introduced to the FE model.As the complexity of the building increases, as is the case for historical unreinforced masonry buildings, the errors and uncertainties in the analysis also increase. In the presence of high and numerous uncertainties originating from multiple sources, deterministic approaches in which parameters are defined as constant values assumed to be known with certainty cannot be implemented reliably. Probabilistic methods, however, provide a rigorous and rational means in treating the uncertainty present in the FE analysis of historical unreinforced masonry buildings. The way in which uncertainty in historical unreinforced masonry construction is treated is one of the novel and main contributions...

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“…Assuming a low level of dynamic (i.e., non-destructive) excitation, the principle of such tests is the comparison of dynamic characteristics of the structure [18,19]. The characteristics most frequently in mind are the resonant frequencies and their corresponding modes of vibration.…”

Section: Introductionmentioning

confidence: 99%

The Application of Carbon Composites in the Rehabilitation of Historic Baroque Vaults

et al. 2015

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Abstract:The stabilization and reinforcement of damaged barrel vaults with lunettes over an arcaded walk, applying composite strips based on high-strength carbon fibers and epoxy resin, was performed during the restoration of a historic monastery. The application of reinforcing composite strips in the soffit of damaged barrel vaults was preceded by relatively extensive experimental research and theoretical analyses. This method significantly reduces the interventions into and the degradation of the original historic structure (surface application) and is reversible.

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Integrity assessment of masonry arch bridges using the dynamic stiffness technique

Cited by 19 publications

References 1 publication

Vibration characteristics of vaulted masonry monuments undergoing differential support settlement

Vibration characteristics of vaulted masonry monuments undergoing differential support settlement

Calibration under uncertainty for finite element models of masonry monuments

The Application of Carbon Composites in the Rehabilitation of Historic Baroque Vaults

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