Operational Modal Analysis of a Historic Tower in Bari

Diaferio, Mariella; Foti, Dora; Mongelli, Michele; Giannoccaro, Nicola Ivan; Andersen, Palle

doi:10.1007/978-1-4419-9316-8_31

Cited by 23 publications

(22 citation statements)

References 9 publications

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“…In this perspective an extensive testing campaign and an accurate dynamic identification will give more realistic results of the level of damage. Applications are found in [14][15][16][17][18][19] where EFDD and SSI methods and Peak Picking technique for output-only signals are used to identify the parameters of the structures.…”

Section: Mode Shapes Curvature Methodsmentioning

confidence: 99%

Dynamic Identification Techniques to Numerically Detect the Structural Damage

Foti

2013

TOBCTJ

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Damage detection in civil engineering structures using changes in measured modal parameters is an area of research that has received notable attention in literature in recent years. In this paper two different experimental techniques for predicting damage location and severity have been considered: the Change in Mode Shapes Method and the Mode Shapes Curvature Method. The techniques have been applied to a simply supported finite element bridge model in which damage is simulated by reducing opportunely the flexural stiffness EI. The results show that a change in modal curvature is a significant damage indicator, while indexes like MAC and COMAC -extensively and correctly used for finite element model updating -lose their usefulness in order to damage detection.

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Section: Mode Shapes Curvature Methodsmentioning

confidence: 99%

Dynamic Identification Techniques to Numerically Detect the Structural Damage

Foti

2013

TOBCTJ

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“…For existing buildings it is very difficult to assume finite element models (FEMs) in a nonlinear analysis, which could exactly describe the behavior of the real structure [7][8][9][10][11]. To this aim identification techniques based on non-destructive experimental tests are often used [12][13][14][15] The difficulties of determining the experimental data required for FE modeling in nonlinear analyses are overcome by the Italian Code NTC 08 [16,17] that uses tabulated values (including wide enough ranges of typologies) instead of a few acquired experimental data.…”

Section: Introductionmentioning

confidence: 99%

A new experimental approach to the pushover analysis of masonry buildings

Foti¹

2015

Computers & Structures

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“…After that, the results obtained from the measurements can be considered almost accurate [1]. The application of well-known different identification techniques include: The Crystal-Clear Stochastic Subspace Identification (CC-SSI) method [2], the Stochastic Subspace Identification (SSI) method [3], and the Enhanced Frequency Domain Decomposition (EFDD) method [4]. The use of the ambient vibration measurements has been proven to be relatively fast, cost reducing and economically efficient for the determination of dynamic characteristics [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Masonry Infilled Reinforced Concrete Building during Construction Stages Using ABAQUS Software

2019

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The effects of seismic actions on reinforced concrete (RC) structures are strongly influenced by the dynamic behavior of their materials. It is crucial to find a simple definition of the natural frequencies of reinforced concrete buildings, particularly in relation to both principal and secondary elements constructing the reinforced concrete building type. This paper firstly presents a comparison with the ambient vibration surveys. An analysis model of different stages of construction of the reinforced concrete masonry wall was compared using the finite element software. In the second step, structural responses of the model were investigated by means of static analysis. Three main types were examined: Bare frame for one, two and three storeys; brick-walled; and coated cases. Modal analysis is carried out by ABAQUS software starting from the deformed building, to provide the natural frequencies and mode shapes. For the natural frequencies, a good agreement is obtained between analytical and experimental results. Furthermore, the comparison results between different cases show that the application of the plaster work increases the lateral stiffness and has significant effects on the dynamic response of the buildings. The experimental measurements taken during different stages of construction provide more information for the structure compared to the ones obtained from only a single measurement at the completion stage of building. There have been a few similar studies conducted in the past [6].Rombach [7] concluded that one of the most important advantages of construction-stage analysis is that the engineer can examine stress distributions as well as deformations at different levels of the construction sequence. Arslan and Duemuş [8] and Kaplan et al. [9] determined natural frequencies, mode shapes and damping ratios of full-scale one-storey one-bay infilled RC frames for bare frame, brick infilled and brick infilled with plaster using the Operational Modal Analyses method under ambient vibration. Results demonstrated that the dynamic characteristics change fundamentally relying upon the existence of an infill wall and plaster, and should be considered in structural analysis. Experimental and analytical approaches have been noted in many masonry-infilled RC buildings researchers such as the evaluation of dynamic characteristics (natural frequency in particular). Bayraktar et al. [10] found that the first measured natural frequencies of three buildings which consisted of three construction stages named bare frames, infill walls, and completed building stages, were greater than the calculated frequencies. investigated the impact of cracking of the six-storey building in the period of vibration. Bikçe et al. [12] showed that the period obtained from the analytical results increased half a percent with both the measured and code values. Amanat and Hoque [13] used modal analysis to determine the fundamental frequency of vibration of several forms of RC-framed buildings infills and concluded that the primary parameters ...

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Operational Modal Analysis of a Historic Tower in Bari

Cited by 23 publications

References 9 publications

Dynamic Identification Techniques to Numerically Detect the Structural Damage

Dynamic Identification Techniques to Numerically Detect the Structural Damage

A new experimental approach to the pushover analysis of masonry buildings

Numerical Modeling of Masonry Infilled Reinforced Concrete Building during Construction Stages Using ABAQUS Software

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