Discussion. Forth Road Bridge.

Anderson, J K; Hamilton, James; Henderson, W; McNeil, John S.; Roberts, Sir G; Smith, H Shirley; Pugsley, Sir A; Pain, J F; Goldstein, A; Hyatt, K E; Brown, C D; Wood, R B; Knox, Hsg; Kerensky, O A; Berri,

doi:10.1680/iicep.1967.8593

Cited by 3 publications

(1 citation statement)

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“…The road bridge runs at 3˚from north. The construction of the bridge was well described shortly after its completion (Anderson et al, 1965). It has a stiffening truss underneath the deck, and significant torsional restraint is provided at each end of the deck.…”

Section: Gps Measurementsmentioning

confidence: 99%

Deflection and frequency monitoring of the Forth Road Bridge, Scotland, by GPS

Roberts¹,

Brown

Meng

et al. 2012

Proceedings of the Institution of Civil Engineers - Bridge Engi

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The use of carrier phase kinematic GPS (global positioning system) has evolved into a reliable technique to measure both the three-dimensional magnitudes and frequencies of movements of structures. Techniques have been developed that tackle errors caused by multipath, tropospheric delay and issues relating to satellite geometry. GPSderived movements compare well with data from both design predictions and structural models. Results from field trials carried out on the Forth Road Bridge are presented. This paper brings together key results that outline the procedure as well as a series of new data that indicate other potential applications. GPS data were collected continuously over a period of 46 h at a minimum rate of 10 Hz. During the trials wind speed, wind direction, relative humidity and temperature were also recorded. Frequently there was very heavy traffic flow, and at one point a special load (a 100-t lorry) passed over simultaneously to the heavy daytime flow of traffic. Data from a planned load trial during a brief bridge closure are reported and compared with the limited results available from a finite element model. Measured vibration frequencies are also computed from GPS data and compared with those given in the literature. In addition, results indicating the change in structural characteristics are also presented -in particular changes of mass associated with changes in traffic loading are observed. The results show the performance of GPS as it has developed in recent years, and that it can now reliably be used as a significant part of structural health monitoring schemes, giving both the magnitude of quasi-static deflections in known time periods and hence the frequency of dynamic movements of structures.

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Section: Gps Measurementsmentioning

confidence: 99%

Deflection and frequency monitoring of the Forth Road Bridge, Scotland, by GPS

Roberts¹,

Brown

Meng

et al. 2012

Proceedings of the Institution of Civil Engineers - Bridge Engi

View full text Add to dashboard Cite

show abstract

Oscillation Response of Structures in the Natural Wind

Dutt

1980

Wind Engineering

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Dynamic response of a vertical cantilever structure in the natural wind

Dutt¹

1973

Strain

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The paper describes an investigation in which the dynamic response of a vertical cantilever structure exposed to the natural turbulent wind was observed. The structure consisted of a steel tube 2.743 m (9 ft) high on the top of which was mounted a closed drum 609.6 mm (2 ft) diameter by 609.6 mm (2 ft) high. The deflexions of the drum on two orthogonal axes were measured and also the strains near the lower end of the steel tube. Wind velocity was measured with a hot-wire anemometer and all the measurements were recorded on a high speed ultraviolet recording galvanometer. The results are considered in two parts: ( a ) the response transverse to the wind direction ( 6 ) the response in the direction of the wind. The transverse displacements are accounted forb y vortex shedding andthe longitudinal displacements can be calculated from the wind velocity trace, given the requisite structural parameters. Many engineering structures can be considered as structures of one degree of freedom and it appears that the behaviour of all such structures can be predicted by the method used in this investigation.'Strain'. January 1973

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Discussion. Forth Road Bridge.

Cited by 3 publications

References 0 publications

Deflection and frequency monitoring of the Forth Road Bridge, Scotland, by GPS

Deflection and frequency monitoring of the Forth Road Bridge, Scotland, by GPS

Oscillation Response of Structures in the Natural Wind

Dynamic response of a vertical cantilever structure in the natural wind

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