Effect of Vehicle Velocity on the Dynamic Amplification of Two Vehicles Crossing a Simply Supported Bridge

Brady, Sean P.; O’Brien, Eugene J.

doi:10.1061/(asce)1084-0702(2006)11:2(250)

Cited by 28 publications

(18 citation statements)

References 6 publications

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“…As it is 1-dimensional, this model would not be expected to be very accurate. Similar models were compared to more sophisticated models and to field measurements in a previous study [10,11].…”

Section: Description Of the Modelmentioning

confidence: 99%

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Characteristic dynamic traffic load effects in bridges

O’Brien

Rattigan

González

et al. 2009

Engineering Structures

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When formulating an approach to assess bridge traffic loading with allowance for Vehicle-Bridge Interaction (VBI), a trade-off is necessary between the limited accuracy and computational demands of numerical models and the limited time periods for which experimental data is available. Numerical modelling can simulate sufficient numbers of loading scenarios to determine characteristic total load effects, including an allowance for VBI. However, simulating VBI for years of traffic is computationally expensive, often excessively so. Furthermore, there are a great many uncertainties associated with numerical models such as the road surface profile and the model parameter values (e.g., spring stiffnesses) for the heavy vehicle fleet. On site measurement of total load effect, including the influence of VBI, overcomes many of these uncertainties as measurements are the result of actual loading scenarios as they occur on the bridge. However, it is often impractical to monitor bridges for extended periods of time which raises questions about the accuracy of calculated characteristic load effects.Soft Load Testing, as opposed to Proof Load or Diagnostic Load Testing, is the direct measurement of load effect in bridges subject to random traffic. This paper considers the influence of measurement period on the accuracy of soft load testing predictions of characteristic load effects, including VBI, for bridges with two lanes of opposing traffic. It concludes that, even for relatively short time periods, the estimates are reasonably accurate and tend to be conservative. Provided the data is representative, Soft Load Testing is shown to be a useful tool for calculating characteristic total load effect.

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Section: Description Of the Modelmentioning

confidence: 99%

“…Many authors [1,10,11,15] report values of dynamic amplification factor, defined as the ratio of total load effect to the corresponding static load effect. Both the static and the total load effect in such a calculation correspond to the same loading scenario.…”

Section: Assessment Dynamic Ratio (Adr)mentioning

confidence: 99%

Characteristic dynamic traffic load effects in bridges

O’Brien

Rattigan

González

et al. 2009

Engineering Structures

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“…To maximize confidence in the results from the finite element model, the dynamic behaviour of this model has been calibrated against site-measured responses. This calibration was carried out for single and two-truck meeting events using different combinations of 2-axle and 3-axle vehicles [10].…”

Section: The Bridgementioning

confidence: 99%

Assessment dynamic ratio for traffic loading on highway bridges

Caprani¹,

González

Rattigan

et al. 2012

Structure and Infrastructure Engineering

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“…While considerable research has been carried out on single truck crossing events on bridges [3][4][5][6][7][8][9][10], the dynamics of two-truck meeting events has received less attention [11][12][13][14][15][16]. Finite Element (FE) Vehicle Bridge-Interaction (VBI) models of meeting events can be constructed but are computationally expensive and they include a degree of uncertainty on many of the vehicle dynamic parameters, and in particular, those intervening in the critical meeting events.…”

Section: Introductionmentioning

confidence: 99%

“…However, vehicle dynamic parameters such as tire stiffness, suspension stiffness, damping or mass moment of inertia are less influential on the bridge response in the case of very good profiles and relatively long bridges. So, Brady and OBrien [12] have considered the case of two moving point (2P-) loads on a 1D simply supported beam. This is clearly simplistic as it fails to allow for the interaction between the truck and the bridge masses, the road surface profile and the truck suspension systems, to name just some parameters.…”

Section: Introductionmentioning

confidence: 99%

Critical speed for the dynamics of truck events on bridges with a smooth road surface

González

O’Brien

Cantero

et al. 2010

Journal of Sound and Vibration

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Simple numerical models of point loads are used to represent single and multiple vehicle events on two-lane bridges with a good road profile. While such models are insufficiently complex to calculate dynamic amplification accurately, they are presented here to provide an understanding of the influence of speed and distance between vehicles on the bridge dynamic response. Critical combinations of speed as a function of main bridge natural frequency and meeting point of two vehicles travelling in opposite directions are identified. It is proposed that such simple models can be used to estimate the pattern of critical speeds versus dynamic amplification for heavy trucks on a bridge with a relatively smooth surface. The crossing of a threedimensional spring-dashpot truck is simulated over a bridge plate model to test this hypothesis for a range of road roughness. Further validation is carried out using the site-specific mean pattern associated to field measurements due to the passage of a truck population. The latter is found to be closely resembled by the theoretical pattern derived from simple point load models. Keywords

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Effect of Vehicle Velocity on the Dynamic Amplification of Two Vehicles Crossing a Simply Supported Bridge

Cited by 28 publications

References 6 publications

Characteristic dynamic traffic load effects in bridges

Characteristic dynamic traffic load effects in bridges

Assessment dynamic ratio for traffic loading on highway bridges

Critical speed for the dynamics of truck events on bridges with a smooth road surface

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