Real road load compared to standard load for Brazilian bridges

Stucchi, Fernando Rebouças; Luchi, Lorenzo Augusto Ruschi e

doi:10.1680/bren.13.00028

Cited by 2 publications

(4 citation statements)

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“…The Federal Highway Administration of USA (2015) considers some scenarios for compound vehicles as depicted in Figure 1. On the other hand, Melo (2018) comments that the Brazilian Traffic Code permits the following kinds of trucks and trolleys as depicted in Figure 2 The effect of real vehicles over bridges in context of the Brazilian reality is addressed by Stucchi and Luchi (2014). They considered the probability occurrence of traffic jam with aleatory distribution of vehicles over the bridge.…”

Section: Dynamic Analysis Of a Highway Bridge Beammentioning

confidence: 99%

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Dynamic analysis of a highway bridge beam under the passage of compound heavy trucks with multiple trailers

Metz,

Machado,

Arndt

et al. 2023

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PurposeRealistic composite vehicles with 2, 3, 5 and 9 axles, consisting of a truck with one or two trailers, are addressed in this paper by computational models for vehicle–bridge interaction analysis.Design/methodology/approachThe vehicle–bridge interaction (VBI) models are formed by sets of 2-D rigid blocks interconnected by mass, damping and stiffness elements to simulate their suspension system. The passage of the vehicles is performed at different speeds. Several rolling surface profiles are admitted, considering the maintenance grade of the pavement. The spectral density functions are generated from an experimental database to form the longitudinal surface irregularity profiles. A computational code written in Phyton based on the finite element method was developed considering the Euler–Bernoulli beam model.FindingsSeveral models of composite heavy vehicles are presented as manufactured and currently travel on major roads. Dynamic amplification factors are presented for each type of composite vehicle.Research limitations/implicationsThe VBI models for compound heavy vehicles are 2-D.Social implicationsThis work contributes to improving the safety and lifetime of the bridges, as well as the stability and comfort of the vehicles when passing over a bridge.Originality/valueThe structural response of the bridge is affected by the type and size of the compound vehicles, their speed and the conservative grade of the pavement. Moreover, one axle produces vibrations that can be superposed by the vibrations of the other axles. This effect can generate not usual dynamic responses.

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Section: Dynamic Analysis Of a Highway Bridge Beammentioning

confidence: 99%

“…The effect of real vehicles over bridges in context of the Brazilian reality is addressed by Stucchi and Luchi (2014). They considered the probability occurrence of traffic jam with aleatory distribution of vehicles over the bridge.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of a highway bridge beam under the passage of compound heavy trucks with multiple trailers

Metz,

Machado,

Arndt

et al. 2023

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“…In Brazil, an important work for determining the traffic load model was that by Stucchi and Luchi [30], who simulated the traffic in grid concrete bridges and in box girder section, with beams span varying between 30 m and 200 m, in congestion situation, using data collected from road scale weighing using gumbel distribution and a return period of 140 years. In Europe, the analyses performed by O'Brien and Enright [25] and Sivakumar [29] used moving weighing to model load on bridges.…”

Section: Calibration Of the International Standards For Prestressed C...mentioning

confidence: 99%

“…So that this study could be compared to Caprani, Mayer and Siamphukdee [5], we have to convert the action model value into annual exceedance probability. For the conversion, the maximum moment due to the traffic loading is considered to follow a type-1 Gumbel distribution, as presented by Obrien et al [24] and and Stucchi and Luchi [30], and the value of the coefficient of variation (CV) is 0.18, as presented in Rakoczy and Nowak [28]. The cumulative probability density function of a type-1 Gumbel distribution is:…”

Section: Conversion Of the Traffic Load Model Value Into Annual Excee...mentioning

confidence: 99%

Reliability analysis of a prestressed bridge beam designed in serviceability limit state as recommended by NBR 6118 and 7188

Lyra

Beck

Stucchi

2020

Rev. IBRACON Estrut. Mater.

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Nowadays it is known that it is important to study the safety of structures to avoid tragic accidents or economic losses. The most widely used method in the world to evaluate the safety of structures is structural reliability. The reliability index of prestressed precast beams of bridges designed using Brazilian standards (NBR6118 and NBR7188) is not known. This work evaluates the annual reliability indexes of a prestressed precast beam bridge at the serviceability limit state (SLS) projected using the Brazilian standard and compares it with results from the literature. The studied bridge has 33.5 meters of span, is simply supported, constituted by five precast concrete beams with U section. The reliability analysis was carried out using two methods for the four limit state equations: First Order Mean Value (FOMV) and First Order Reliability Method (FORM). Sensitivity analyzes were performed to consider both the relative contribution of these variables and the effect of their distributions on the annual reliability indexes for SLS. It was verified that the effect of load trains and the allowable stress significantly reduce the reliability index obtained for Brazilian standard. The service limit state equations are particularly sensitive to load trains, allowable stress and prestress losses, as well as their respective distributions.

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Real road load compared to standard load for Brazilian bridges

Cited by 2 publications

References 0 publications

Dynamic analysis of a highway bridge beam under the passage of compound heavy trucks with multiple trailers

Dynamic analysis of a highway bridge beam under the passage of compound heavy trucks with multiple trailers

Reliability analysis of a prestressed bridge beam designed in serviceability limit state as recommended by NBR 6118 and 7188

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