Dynamic amplification of a multi-span, continuous orthotropic bridge deck under vehicular movement

Rezaiguia, Abdelouahab; Ouelaa, Nouredine; Laefer, Debra F.; Guenfoud, Salah

doi:10.1016/j.engstruct.2015.06.044

Cited by 32 publications

(14 citation statements)

References 27 publications

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“…In a recent publication, ref. [13] report on DAF results for sagging bending moment in continuous bridges; however, there is no mention to hogging moments. The modes of vibration of a structure are characterized by their mode shape and their modal frequency.…”

Section: Daf =mentioning

confidence: 99%

Dynamic Amplification Factor of Continuous versus Simply Supported Bridges Due to the Action of a Moving Vehicle

González

Mohammed

2018

Infrastructures

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Research to date on Dynamic Amplification Factors (DAFs) caused by traffic loading, mostly focused on simply supported bridges, is extended here to multiple-span continuous bridges. Emphasis is placed upon assessing the DAF of hogging bending moments, which has not been sufficiently addressed in the literature. Vehicle-bridge interaction simulations are employed to analyze the response of a finite element discretized beam subjected to the crossing of two vehicle types: a 2-axle-truck and a 5-axle truck-trailer. Road irregularities are randomly generated for two ISO roughness classes. Noticeable differences appear between DAF of mid-span moment in a simply supported beam, and DAFs of the mid-span sagging moment and of the hogging moment over the internal support in a continuous multiple-span beam. Although the critical location of the maximum static moment over the internal support may indicate that DAF of hogging moment would have to be relatively small, this paper provides evidence that this is not always the case, and that DAFs of hogging moments can be as significant as DAF of sagging moments.

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Section: Daf =mentioning

confidence: 99%

Dynamic Amplification Factor of Continuous versus Simply Supported Bridges Due to the Action of a Moving Vehicle

González

Mohammed

2018

Infrastructures

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“…The equations of fitted lines can be obtained as Eqs. (6) and (7). The DAF is a function of / in these equations.…”

Section: Dynamic Amplification Factor Calculatementioning

confidence: 99%

“…In their analysis, it was found that torsion modes due to curvature of the deck considerably influence the DAF. Rezaiguia [7] found that when the load is applied far from the central axis of the deck, the impact factor (IF) obtains in the considerable presence of torsion modes.…”

Section: Introductionmentioning

confidence: 99%

A novel index for damage detection of deck and dynamic behavior of horizontally curved bridges under moving load

Najafabadi¹,

Daneshjoo²,

Bayat³

2017

J. vibroeng.

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The purpose of this paper is to evaluate the responses of horizontally curved bridges that are affected by vehicles load. The effect of vehicles dynamic loads on bridges is influenced by factors such as geometric characteristics of structures and moving loads specifications. To consider the effect of dynamic loads in design of bridges, static load increases with a coefficient which is called "impact factor" in Design Codes. In this paper, by examining the effect of curvature of deck and the speed of vehicles which are passing along the bridge on the dynamic response of bridge, set of new equations for DAF is presented. For this purpose, dynamic analysis is performed for seven bridges with different radius of curvature under the influence of AASHTO truck. In the case study models, it can be seen that the separation of impact factor into two different coefficients; support reaction and displacement responses make bridge design more economical and safer. Reduction of the curvature radius decreases dynamic amplification factor (both coefficients). To identify the possible damages of the examined bridges in the early stages of the advent a new index is presented. This index can predict the damages due to moving vehicles.

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“…The total response has both static and dynamic components. Dynamic Amplification Factor (DAF) is a term widely used in the literature Mohammed, Cantero, González, & Al-Sabah, 2014;Rezaiguia, Ouelaa, Laefer, & Guenfoud, 2015) to quantify the interaction between the bridge and vehicle. Dynamic Amplification Factor is defined as the ratio of the maximum total response to the maximum static response during a vehicle crossing, for the load effect of the bridge being examined (i.e., bending moment at mid-span section).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Impact of Heavy Long Vehicles With Equally Spaced Axles on Short-Span Highway Bridges

Mohammed

González

Cantero

2018

BJRBE

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Extremely large trucks with a weight exceeding the standard require a permit before they are allowed to cross the bridges of a specific route. For the purpose of safety, an escort is often employed to maintain a distance between vehicles and to ensure that the bridge load remain below the allowed maximum. Given that the speed of these large vehicles is quite slow and that the amplitude of vibrations normally declines when the vehicle mass is large, a minor dynamic amplification of the bridge response is expected. However, some of these large trucks have a unique feature characterized by “multiple equally-spaced axles”, something that is uncommon in normal vehicle. The application of axle forces at equal intervals can dynamically excite bridges to a considerable extent, even at low speeds. These “critical” low speeds are estimated a priori from the axle spacing of the truck and the main frequency of vibration of the bridge. This paper demonstrates that when the “critical” speed is unavoidable, a relatively high dynamic allowance must be added to static calculations before granting a permit to a long heavy vehicle.

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Dynamic amplification of a multi-span, continuous orthotropic bridge deck under vehicular movement

Cited by 32 publications

References 27 publications

Dynamic Amplification Factor of Continuous versus Simply Supported Bridges Due to the Action of a Moving Vehicle

Dynamic Amplification Factor of Continuous versus Simply Supported Bridges Due to the Action of a Moving Vehicle

A novel index for damage detection of deck and dynamic behavior of horizontally curved bridges under moving load

Dynamic Impact of Heavy Long Vehicles With Equally Spaced Axles on Short-Span Highway Bridges

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