Monitoring of traffic action local effects in highway bridge deck slabs and the influence of measurement duration on extreme value estimates

Treacy, Mark Anthony; Brühwiler, Eugen; Caprani, Colin C.

doi:10.1080/15732479.2013.835327

Cited by 14 publications

(6 citation statements)

References 25 publications

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“…The design combination of both loads is computed for ultimate limit state (ULS) and serviceability limit state (SLS) respecting formulations proposed in standards [29]. Considering G to be the value of self-weight of the structure and the wind to be a leading action, design combinations E d can be written as following: (6) SLS:E d = G + (F w ) lead + (ψ 0 F t ) accomp (7) where: ψ 0 are factors for combination value of accompanying variable traffic actions, ψ 0,TS = 0.75 -for the concentrated axle load (LM1, [18]) and ψ 0,UDL = 0.4 -for the uniformly distributed load (LM1, [18]). Considering values of partial factors for the wind (γ w = 1.5) and traffic (γ w = 1.35), Equation (6) and Equation ( 7) take the following form:…”

Section: Design Load Modelmentioning

confidence: 99%

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Probabilistic analysis of the effect of the combination of traffic and wind actions on a cable-stayed bridge

Nesterova

Schmidt

Soize

2019

BRS

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At the design stage of bridges, all possible actions and their combinations are to be considered. In certain cases, the influence of the environment must be taken into account in addition to design values of traffic loads. In order to assess the current state of an existing bridge, actual applied actions must be considered: updated traffic situation, monitored climatic actions, and their unfavorable combinations. Therefore, monitoring all actions makes it possible to adequately study a structure. Since only limited data are generally available, the important question is how the quality and the duration of monitoring influence the assessment of the structure. In the current study applied to the Millau viaduct, effects from monitored traffic and wind actions are evaluated. The statistical analysis of applied actions and caused effects is done according to the Peaks Over Threshold (POT) approach. Results include the comparison between confidence intervals of predictions, for each studied load case and for various periods of monitoring. In addition, this paper presents study of the influence of the length of monitoring data on predictions of future extreme load cases, and also proposes an alternative efficient algorithm for threshold choice in the POT approach.

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Section: Design Load Modelmentioning

confidence: 99%

“…Concerning bridges, EVT has been successfully used to envision the forthcoming situation of structures [7,8] based on the long-term monitoring of traffic actions. For the proper use of EVT, usually, only extreme actions (meaning the highest in absolute value) are considered.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic analysis of the effect of the combination of traffic and wind actions on a cable-stayed bridge

Nesterova

Schmidt

Soize

2019

BRS

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“…Diese Näherungsfunktionen erlauben eine Vorhersage darüber, welche Extremwerte der Zustandsgröße zukünftig auftreten werden [7] und welche Zuverlässigkeit gegen ein Bauwerksversagen sich hieraus ergibt [8]. Wichtig ist hierbei, dass ausreichend lange Messzeiträume für eine solche Untersuchung zur Verfügung stehen müssen [9] und die Langzeitstabilität der Messanlage für den Zeitraum gewährleistet ist [10].…”

Section: Introductionunclassified

Beurteilung der Bauwerkszuverlässigkeit durch Bauwerksmonitoring

Herbrand

Wenner²,

Ullerich

et al. 2021

Bautechnik

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Durch den schlechten Zustand vieler älterer Brücken und Änderungen in den Regelwerken ergeben sich häufig Defizite bei der Nachrechnung von Bestandsbrücken nach Nachrechnungsrichtlinie. Für den Fall, dass die erforderliche Bauwerkssicherheit nicht nachgewiesen werden kann, können Bauwerksmessungen zeitlich begrenzt oder als Dauermonitoring durchgeführt werden, um Erkenntnisse über die zeitlich veränderliche Beanspruchung zu gewinnen. Zentral hierfür ist die Ableitung von Zustandsindikatoren für das Bauwerk, die letztendlich den Handlungsbedarf für Betreiber und Ingenieure anzeigen. Im einfachsten Fall wird hierfür z. B. ein Ausnutzungsgrad ermittelt, der allerdings keinen Rückschluss auf das Risiko ermöglicht und streng genommen nur eine binäre Bewertung zulässt. In diesem Beitrag wird daher eine Vorgehensweise erläutert und am Beispiel der Hamburger Köhlbrandbrücke umgesetzt, die es erlaubt, einen Zuverlässigkeitsindex als zeitlich veränderlichen Zustandsindikator bezogen auf den Beulnachweis aus den dynamischen Monitoringdaten abzuleiten.

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“…In development of European standards for traffic actions, such as background works on EN [5], some approaches of the extreme values theory (EVT) are used for forecasting of return levels of actions [6]. EVT has been successfully used to envision the forthcoming situation of bridges [7,8] based on the long-term monitoring of traffic actions. One of the most efficient approaches of EVT to be used in wind engineering [9] is the Peaks Over Threshold (POT) method, that has proven to work well also for precipitation predictions with non-stationary data [10] or for electricity demand estimation with a time-varying threshold [11].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Remaining Life of the Orthotropic Deck of a Bridge Exposed to Extreme Traffic and Wind Actions

Nesterova¹,

Schmidt²,

Soize³

2019

Structural Health Monitoring 2019

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Design rules in normative documents provide additional capacity to structures by using safety coefficients and considering the worst cases of loads that in most cases never occur during the life of a structure. This extra capacity allows not only to stay on a safe side during the design operational period of structures but also to re-estimate and to extend their possible operational life. One of the most appropriate ways to estimate the remaining life of an existing structure is the extrapolation of monitored actions or load effects in critical details. The main objective of the current study is the assessment of the reliability of the steel orthotropic deck of a viaduct at the end of its design life based on limited data for traffic and static wind actions. The object of study is the Millau viaduct, a cable-stayed bridge located in Southern France, which is exposed to both, heavy traffic loads and wind loading among other actions. Monitoring data used for traffic are provided from the bridge weigh-in-motion system and include six months of data for the more loaded side of the bridge. Wind velocity and directions for the same period are taken from the structural health monitoring system of the viaduct and the nearest weather station. The methodology is based on fitting the generalized Pareto distribution to extreme stresses induced by traffic actions and by wind in order to obtain return levels at the end of the 120 years design live. Reliability indexes for the most critical part of the deck are calculated for both types of load effects separately and for their combination. Moreover, the comparison between models based on data from monitoring and on European standard models is shown.

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Monitoring of traffic action local effects in highway bridge deck slabs and the influence of measurement duration on extreme value estimates

Cited by 14 publications

References 25 publications

Probabilistic analysis of the effect of the combination of traffic and wind actions on a cable-stayed bridge

Probabilistic analysis of the effect of the combination of traffic and wind actions on a cable-stayed bridge

Beurteilung der Bauwerkszuverlässigkeit durch Bauwerksmonitoring

Estimation of Remaining Life of the Orthotropic Deck of a Bridge Exposed to Extreme Traffic and Wind Actions

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