Ambient vibration survey of the bosporus suspension bridge

Brownjohn, James; Dumanoǧlu, A. A.; Severn, RT; Blakeborough, A

doi:10.1002/eqe.4290180210

Cited by 58 publications

(36 citation statements)

References 3 publications

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“…The fundamental frequency of the Bridge in the vertical and lateral directions, calculated using Fast Fourier Transformation (FFT) analysis using Matlab were 0.116Hz and 0.052Hz respectively. These compared well to previous measurements [Brownjohn et al, 1986;Brownjohn et al, 1994] and FEM calculated frequencies [Karuna et al, 1997a;Karuna et al, 1997b;Karuna et al, 1998a;Karuna et al, 1998b;Brown et al, 1999]. Figures 5 and 6 illustrate two of the 5 height plots for the GNSS receivers located on the Bridge.…”

Section: Field Test Number 2; Validation Of Finite Element Numerical supporting

confidence: 86%

A Tale of Five Bridges; the use of GNSS for Monitoring the Deflections of Bridges

Roberts

Brown

Tang

et al. 2014

Journal of Applied Geodesy

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The first Bridge Monitoring surveying was carried out in 1996 by the authors, through attaching Ashtech ZXII GPS receivers onto the Humber Bridge' parapet, and gathering and further analysing the resulting 1Hz RTK GPS data. Various surveys have subsequently been conducted on the Humber Bridge, the Millennium Bridge, the Forth Road Bridge, the Severn Suspension Bridge and the Avonmouth Viaduct. These were all carried out using survey grade carrier phase/pseudorange GPS and later GNSS receivers. These receivers were primarily dual frequency receivers, but the work has also investigated the use of single frequency receivers, gathering data at 1Hz, 10Hz, 20Hz and even 100Hz. Various aspects of the research conducted are reported here, as well as the historical approach. Conclusions are shown in the paper, as well as lessons learnt during the development of this work. The results are compared to various models that exist of the bridges' movements, and compare well. The results also illustrate that calculating the frequencies of the movements, as well as looking at the magnitudes of the movements, is an important aspect of this work. It is also shown that in instances where the magnitudes of the movements of the bridge under investigation are small, it is still possible to derive very accurate frequencies of the movements, in comparison to the existing models.

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Section: Field Test Number 2; Validation Of Finite Element Numerical supporting

confidence: 86%

A Tale of Five Bridges; the use of GNSS for Monitoring the Deflections of Bridges

Roberts

Brown

Tang

et al. 2014

Journal of Applied Geodesy

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“…Through the last few decades the technology has been applied e.g. on the Golden Gate Bridge, for the second time, using a specially designed mechanical accelerometer (Vincent, 1962) and the third (but not the last) time, by Nigbor (Nigbor, 1984), who provides the experimental detail behind the results presented later in (Abdel-Ghaffar and Scanlan, 1985), on the Humber Bridge (Brownjohn et al, 1987) at Deer Isle (Kumarasena et al, 1989) , both Bosporus bridges (Brownjohn et al, 1989;Brownjohn et al, 1992), Tsing Ma Bridge (Xu et al, 1997) and Storebaelt Bridge, (Frandsen, 2001), to name a few examples. More recent exercises e.g.…”

Section: Dynamic Testing For Condition Assessment and System Identifimentioning

confidence: 99%

Ambient vibration re-testing and operational modal analysis of the Humber Bridge

Brownjohn

Magalhães

Cunha

2010

Engineering Structures

285

108

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An ambient vibration survey of the Humber Bridge was carried out in July 2008 by a combined team from the UK, Portugal and Hong Kong. The exercise had several purposes that included the evaluation of current technology for instrumentation and system identification and the generation of an experimental data set of modal properties to be used for validation and updating of finite element models for scenario simulation and structural health monitoring. The exercise was conducted as part of a project aimed at developing online diagnosis capabilities for three landmark European suspension bridges.Ten stand-alone triaxial acceleration recorders were deployed at locations along all three spans and in all four pylons during five days of consecutive one-hour recordings. Time series segments from the recorders were merged, and several operational modal analysis techniques were used to analyse these data and assemble modal models representing the global behavior of the bridge in all three dimensions for all components of the structure.The paper describes the equipment and procedures used for the exercise, compares the operational modal analysis (OMA) technology used for system identification and presents modal parameters for key vibration modes of the complete structure. suspension bridge operational modal analysis structural identification 4

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“…Although ambient vibration tests (AVTs) provide valuable information for structural identification, verification of analytical models [2][3][4][5][6], and understanding the aerodynamic effect on long-span bridges [7,8], the small excitations they produce are not always adequate. Observations show that the dynamic performances of the structures are quite different during relatively small excitations of ambient vibration and during stronger excitations such as ground motion.…”

Section: Introductionmentioning

confidence: 99%

System identification applied to long‐span cable‐supported bridges using seismic records

Siringoringo

Fujino

2007

Earthq Engng Struct Dyn

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SUMMARYThis paper presents the application of system identification (SI) to long-span cable-supported bridges using seismic records. The SI method is based on the System Realization using Information Matrix (SRIM) that utilizes correlations between base motions and bridge accelerations to identify coefficient matrices of a state-space model. Numerical simulations using a benchmark cable-stayed bridge demonstrate the advantages of this method in dealing with multiple-input multiple-output (MIMO) data from relatively short seismic records. Important issues related to the effects of sensor arrangement, measurement noise, input inclusion, and the types of input with respect to identification results are also investigated. The method is applied to identify modal parameters of the Yokohama Bay Bridge, Rainbow Bridge, and Tsurumi Fairway Bridge using the records from the 2004 Chuetsu-Niigata earthquake. Comparison of modal parameters with the results of ambient vibration tests, forced vibration tests, and analytical models are presented together with discussions regarding the effects of earthquake excitation amplitude on global and local structural modes.

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Ambient vibration survey of the bosporus suspension bridge

Cited by 58 publications

References 3 publications

A Tale of Five Bridges; the use of GNSS for Monitoring the Deflections of Bridges

A Tale of Five Bridges; the use of GNSS for Monitoring the Deflections of Bridges

Ambient vibration re-testing and operational modal analysis of the Humber Bridge

System identification applied to long‐span cable‐supported bridges using seismic records

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