Deflections and Frequency Responses of the Forth Road Bridge Measure by GPS

Brown, Christopher J.; Roberts, Gethin Wyn; Atkins, Chris; Meng, Xiaolin; Colford, Barry

doi:10.1680/bdcam.35935.0052

Cited by 3 publications

(7 citation statements)

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“…Further analysis of the results is currently being conducted, in particular to assess how these frequencies vary due to changing external factors such as the temperature and mass of traffic loading. [Brown et al, 2007]. Figures 12 and 13 illustrate the height deflections of all 4 locations on the bridge over a 40 minute and 10 minute period, respectively.…”

Section: Bridge Cable Frequency Resultsmentioning

confidence: 99%

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Using satellites to monitor Severn Bridge structure, UK

Roberts¹,

Brown²,

Tang³

et al. 2015

Proceedings of the Institution of Civil Engineers - Bridge Engi

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ABSTRACT:The Severn Bridge is a suspension bridge, in total 1,600m long with a main span of 988m and tower heights of 136m.In 2010, a series of field surveys were commissioned to monitor the magnitude and frequencies of the Severn Suspension Bridge's movements, through attaching 9 dual-frequency survey grade GNSS receivers on the Bridge, and two reference GNSS stations located adjacent to the structure. The bridge's GNSS receivers were attached to the tops of the two pairs of towers, as well as 5 GNSS antennas attached directly onto the suspension cables. Four were attached at various locations on the Northern cable, and one on the southern cable.

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Section: Bridge Cable Frequency Resultsmentioning

confidence: 99%

“…Recent work by the authors illustrated a change in the natural frequency of the Forth Road Bridge was detected in the GPS data during peak and quiet periods of traffic loading. The change was correlated well with the extra weight of the traffic on the bridge [Brown et al 2007]. …”

Section: Introductionmentioning

confidence: 84%

Using satellites to monitor Severn Bridge structure, UK

Roberts¹,

Brown²,

Tang³

et al. 2015

Proceedings of the Institution of Civil Engineers - Bridge Engi

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“…Many studies have been conducted on GPS structural monitoring, [10][11][12][13][14][15][16] aiming to determine the response and the main modal frequencies of structures. 17,18 Even though, in all the aforementioned applications, the GPS monitoring was generally successful for determining structure response at cm level, it faced challenges due to multipath effects in the GPS measurements from the structure elements (i.e., towers, cables and passing vehicles on the bridge 19 ) and obstructions or signal interference producing cycle slips in the GPS measurements, 20 resulting in additional coloured noise and biases.…”

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confidence: 99%

Monitoring the response of Severn Suspension Bridge in the United Kingdom using multi‐GNSS measurements

Msaewe

Psimoulis

Hancock

et al. 2021

Structural Contr & Hlth

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The application of GPS in bridge monitoring aims to determine accurately and precisely the response of the deck and towers of the bridge and estimate the main response characteristics (amplitude and modal frequencies). The main requirement of GPS monitoring is a high level of accuracy and availability of fixed solutions, which ensure the reliable operation of GPS and result in the precise estimation of the bridge's response. However, the derived GPS time series of bridge monitoring can be contaminated by noise, due to the performance of the GPS satellite(s), the geometry of the GPS satellite constellation and the potential obstructions due to the bridge elements, which can even lead to GPS solution of poor accuracy and/or precision and result in reduced efficiency of the performance of the GPS monitoring. This study investigates the potential contribution of other Global Navigation Satellite Systems (GNSS) constellations for a more robust and reliable displacement time series solution, derived from multi-GNSS records. More specifically, a novel method is developed to derive the optimal combination of GNSS records to determine the GNSS displacement time series based on checks of parameters which reflect the geometry of the satellite constellation and the quality of the GNSS satellites signals. The method is applied in monitoring of the Severn Suspension Bridge, in the United Kingdom, and it is revealed the enhancement in the GNSS monitoring performance of the bridge response for specific time intervals for various locations on the bridge's support towers, suspension cables and deck.

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“…Εφαρμογές καταγραφής των μετακινήσεων με GPS έχουν πραγματοποιηθεί και σε εύκαμπτες γέφυρες (Nakamura, 2000;Wong et al, 2001;Xu et al, 2002;Akyilmaz et al ,2004;Larocca and Schaal, 2005;Lekidis et al, 2005;Guo et al, 2005). Ενδεικτικό παράδειγμα αποτελεί η καταγραφή των μετακινήσεων με GPS της κρεμαστής γέφυρας Forth Road Bridge της Σκωτίας, με κεντρικό άνοιγμα μήκους 1006m (Brown et al, 2007 (Wong et al, 2001 Chan et al, 2005;Kijewski-Correa et al, 2006;Nickitopoulou et al, 2006;Gikas and Daskalakis, 2006).…”

Section: Rtsunclassified

“…Ακρίβεια προσδιορισμού συντεταγμένων GB-1000 (mm) Brown et al, 2007). Οι choke-ring κεραίες που χρησιμοποιήθηκαν ήταν οι CR-3 της Topcon.…”

Section: μέθοδος μετρήσεων Gpsunclassified

Τεκμηρίωση Δυνατότητας Μετρήσεων Ταλαντώσεων Δύσκαμπτων Κατασκευών Με GPS Και Ρομποτικό Θεοδόλιχο (RTS)

Ψιμούλης¹

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Σχήμα 1.1: Άμεση αύξηση της εγκάρσιας επιτάχυνσης (κόκκινη γραμμή) της Millenium Bridge όταν το φορτίο της υπερβεί ένα συγκεκριμένο όριο ............. Σχήμα 1.2: Πεζογέφυρα Κανελοπούλου και διαγράμματα εγκάρσιων και κατακόρυφων επιταχύνσεων που προκλήθηκαν λόγω διεγέρσης μέσω αλμάτων για τον έλεγχο γεωδαιτικών καταγραφών.

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Deflections and Frequency Responses of the Forth Road Bridge Measure by GPS

Cited by 3 publications

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Using satellites to monitor Severn Bridge structure, UK

Using satellites to monitor Severn Bridge structure, UK

Monitoring the response of Severn Suspension Bridge in the United Kingdom using multi‐GNSS measurements

Τεκμηρίωση Δυνατότητας Μετρήσεων Ταλαντώσεων Δύσκαμπτων Κατασκευών Με GPS Και Ρομποτικό Θεοδόλιχο (RTS)

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