Bridge Aerodynamics 50 Years After Tacoma Narrows - Part I: The Tacoma Narrows failure and after

Wyatt, T.A.

doi:10.1016/s0167-6105(18)80001-0

Cited by 15 publications

(7 citation statements)

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“…The cause is still not fully understood (Wyatt and Walshe, 1992), but the collapse illustrated the importance of a proper consideration of the aerodynamic stability of long span bridges, and investigations after the failure led to the derivation of appropriate wind tunnel scaling laws and wind tunnel methodology by Farquharson in 1949. Work on long span bridges also took place at NPL in the UK, with a full bridge study of the Severn Bridge (Frazer and Scruton, 1952), and the development of section model testing, in parallel with similar work in the USA and Japan.…”

Section: Article In Pressmentioning

confidence: 99%

Wind engineering—Past, present and future

Baker

2007

Journal of Wind Engineering and Industrial Aerodynamics

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Section: Article In Pressmentioning

confidence: 99%

Wind engineering—Past, present and future

Baker

2007

Journal of Wind Engineering and Industrial Aerodynamics

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“…For long span bridges in particular wind-structure interaction can result in modification of modal parameters and lead to catastrophic instability due to the phenomenon of aero-elasticity (Wyatt, 1992). Such effects can be observed not only in wind tunnel testing but also at full scale, using SHM systems (Diana at al., 1992) and there is a large body of research on the topic.…”

Section: Introduction: Variations In Bridge Loading and Dynamic Respomentioning

confidence: 99%

“…SHM systems may also be used to validate design assumptions, for example regarding thermal and vehicular loads. Hence there are strong motives for studying time series of structural loads (wind, vehicles and temperature) and dynamic response parameters and their relationships.For long span bridges in particular wind-structure interaction can result in modification of modal parameters and lead to catastrophic instability due to the phenomenon of aero-elasticity (Wyatt, 1992). Such effects can be observed not only in wind tunnel testing but also at full scale, using SHM systems (Diana at al., 1992) and there is a large body of research on the topic.…”

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confidence: 99%

Effect of vehicular loading on suspension bridge dynamic properties

Westgate

Koo

2014

Structure and Infrastructure Engineering

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Effect of vehicular loading on suspension bridge dynamic propertiesSince the 1970s many researchers have attempted to use changes in natural frequencies as means for condition assessment of large civil engineering structures such as bridges, but have faced the challenge of decoupling frequency variations apparently caused by changing operational conditions. In the case of the Tamar Bridge in southwest England, time series of natural frequencies exhibit diurnal variations resulting from a combination of thermal and vehicular loading, whose effects would need to be compensated for in dynamics-based assessment.By examination of several years of monitoring data, the effects of traffic mass have been characterised and compared with other operational effects. While temperature changes appear to have a greater influence for lateral modes, traffic mass is a strong factor in all modes and the dominant factor for the vertical and torsional modes evaluated.Physics-based explanations for the variable effects of vehicle mass have been sought using a finite element model calibrated against experimental data. As a caution for performance prediction in structural dynamics, while acceptable reconciliation of natural frequencies from FE model and measurements was achievable, reconciling simulated effects of changing mass with observed behaviour has not been straightforward due to the complexity of the retrofitted suspension bridge structure studied.Keywords: bridges, long-span; bridges, suspension; cables; damage assessment; finite element method; roads & highways; structural dynamics; structural engineering; suspended structures; traffic engineering. Introduction: variations in bridge loading and dynamic response characteristicsStructural Health Monitoring (SHM) implementations on civil infrastructure (Brownjohn, 2007) have many purposes that include the tracking of time varying loads and responses in order to identify, characterise and diagnose anomalous performance. In particular, changes in dynamic response parameters, e.g. modal properties such as natural frequencies, have been regarded by many researchers as a possible indicator of structural 'damage' (Brownjohn et al., 2011). SHM systems may also be used to validate design assumptions, for example regarding thermal and vehicular loads. Hence there are strong motives for studying time series of structural loads (wind, vehicles and temperature) and dynamic response parameters and their relationships.For long span bridges in particular wind-structure interaction can result in modification of modal parameters and lead to catastrophic instability due to the phenomenon of aero-elasticity (Wyatt, 1992). Such effects can be observed not only in wind tunnel testing but also at full scale, using SHM systems (Diana at al., 1992) and there is a large body of research on the topic.Rather fewer studies have examined the link between thermal loads (diurnal and seasonal temperature variations) and dynamic properties, which are reviewed by Xia, Chen, Weng, Ni and Xu (2012). Of these only a...

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“…One of the main concerns for long-span bridges is wind-induced dynamic response, which is most commonly predicted using frequency domain methods, where the aeroelastic effects are introduced in terms of experimentally determined aerodynamic derivatives [1][2][3][4][5][6][7][8][9][10][11][12]. This approach is an extension of classical airfoil theory [13], where Theodorsen's function provides the self-excited forces that are actions generated by the motion of the cross section in the fluid flow.…”

Section: Introductionmentioning

confidence: 99%