Non-destructive modal parameter identification of historical timber bridges using ambient vibration tests after restoration

Altunışık, Ahmet Can; Kalkan, Ebru; Okur, Fatih Yesevi; Özgan, Korhan; Karahasan, Olguhan Şevket; Bostancı, Abdullah

doi:10.1016/j.measurement.2019.06.051

Cited by 18 publications

(3 citation statements)

References 28 publications

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“…In terms of timber, there has been an increasing interest in non-destructive and micro-destructive techniques that allow for material characterization without the need to compromise the integrity of the building fabric [42,43]. Here we present analysis of historic timbers where small-scale destructive analysis was able to be conducted.…”

Section: Discussionmentioning

confidence: 99%

Chemical and Mechanical Differences between Historic and Modern Scots Pine Wood

2020

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Timber is one of the most common historic building materials, but relatively little is known about how it ages in situ. Here we investigate historic and modern Scots pine to determine any chemical or mechanical differences between them. Fourier-transform infrared (FTIR) microscopy was used to investigate differences in the chemical composition of Scots pine (Pinus sylvestris L.) timber, comparing small samples from historic beams about 500 years old with modern timber. The hemicellulosic acetyl content was reduced by about half in the historic samples, uniformly across the thickness of the beams. A chemical mechanism was therefore suggested for the loss of acetyl groups, as has been observed in paper. In paper, deacetylation and the resulting release of acetic acid are accompanied by loss of strength. Mechanical testing of the historic timber was difficult because the available length of the samples along the grain was only 20 mm. After developing a miniaturized compression test developed for the purpose, it was shown that the relative stiffness of the historic Scots pine samples was reduced by about half compared to modern material.

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Section: Discussionmentioning

confidence: 99%

Chemical and Mechanical Differences between Historic and Modern Scots Pine Wood

2020

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“…Although the main purpose of bridge construction is to provide transportation, they are generally designed as piece of art. Many of these bridges vary depending on a number of factors such as material usage, design, architectural texture, inscriptions, traditional preferences [3][4][5]. Historical bridges built with stone materials and bearing the traces of their civilization are extremely important [6,7].…”

Section: Introductionmentioning

confidence: 99%

Ayvalıkemer (Sillyon) historical masonry arch bridge: a multidisciplinary approach for structural assessment using point cloud data obtained by terrestrial laser scanning (TLS)

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Tercan

Emsen

2021

J Civil Struct Health Monit

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Historical structures are cultural heritage constituents that convey the traces and characteristic features of civilizations to the present days. One of these structures, which are among the monumental artefacts, are historical bridges. To protect historical buildings, 3D photogrammetric documentation of these structures, detailed determination of geometric and material properties and performing computer-aided structural analysis using appropriate modelling techniques are very important. The aim of this study is to present an effective, reliable, and fast multidisciplinary approach for the analysis of historical masonry bridges. The aforementioned approach is presented as an example for the behavior of the recently restored historical Ayvalıkemer (Sillyon) masonry arch bridge under possible loadings. Terrestrial laser scanning (TLS) was used to determine the bridge geometry with high accuracy. The point cloud data obtained from TLS was simplified and a three-dimensional CAD based solid model of the structure was created. This solid body has been formed the basis of the macro model for structural analysis. CDP material model was used to describe the inelastic behavior of homogenized structure. Thus, an analysis was carried out which presents the structural behavior of a historical bridge with high accuracy and reliability. KeywordsTerrestrial laser scanning (TLS) • Structural analysis • Macro modelling • Sillyon (Ayvalıkemer) • Historical structures • Masonry arch bridges * Engin Emsen

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“…Vibration-based dynamic system identification process has been performed in historical buildings and sufficient results and experiences have been obtained [8][9][10][11][12]. This process was also examined for bridges [13][14][15][16][17][18][19], buildings [11,[20][21][22][23][24][25] and tall towers [26][27][28][29][30][31][32]. This method is more effective for bridge structures, due to their considerable permanent ambient vibrations [18,19].…”

Section: Introductionmentioning

confidence: 99%

An enhanced indirect video-based measurement procedure for dynamic structural system identification applications

2021

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A video-based indirect sensing procedure for dynamic identification purposes is presented. To overcome major limitations of video-based methods in real on-site measurements, a novel three step pre-modification, magnification, post-modification process is developed. This process includes revision of the initial input video record in order to delete disturbing objects, utilizing a magnification method to filter the frequency content of the monitored motion and using a revision step for elimination of noises generated during magnification process. Finally, a set of digital signal and image processing analyses are performed on the modified video using virtual visual sensor technology. Based on the results of this research, motion signals of the monitored object are detected. The proposed approach has been used for identification of dynamic characteristics of two historic masonry minarets in Istanbul. Results shows that the proposed procedure is able to assess the dynamic characteristics of the monitored structure with a high-level of accuracy.

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Non-destructive modal parameter identification of historical timber bridges using ambient vibration tests after restoration

Cited by 18 publications

References 28 publications

Chemical and Mechanical Differences between Historic and Modern Scots Pine Wood

Chemical and Mechanical Differences between Historic and Modern Scots Pine Wood

Ayvalıkemer (Sillyon) historical masonry arch bridge: a multidisciplinary approach for structural assessment using point cloud data obtained by terrestrial laser scanning (TLS)

An enhanced indirect video-based measurement procedure for dynamic structural system identification applications

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