Bridge Load Rating

Armendariz, Rafael; Bowman, Mark D.

doi:10.5703/1288284316650

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…Bridge load rating generally refers to the method which is used to evaluate the load carrying capacity of the existing bridge through different processes. (1) This process uses the already available information which are mentioned in the plans or the design calculation so that the strength and serviceability of a bridge structure can be evaluated, with the main purpose of deriving at the conclusion whether any action is required in order to strengthen a bridge or not. This process becomes quite difficult and tedious in absence of any information related to the bridge.…”

Section: Introductionmentioning

confidence: 99%

Flexural and shear load rate evaluation on Pre-stressed concrete Box Girder Superstructure under the effect of IRC Loading

Srivastava,

Mishra

2024

IOP Conf. Ser.: Earth Environ. Sci.

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In the Present time Bridge Load Rating plays an important role in estimating the structural condition as well as the performance and the safety parameter of the already constructed bridge. There are different experimental method which are available in order to perform the load rating phenomenon. The primary goal of this research project is to present an analytical way in which the load carrying capacity through the process known as Bridge Load Rating can be performed on the software basis as per the IRC Codes. Till now the only codes available in the MIDAS Civil software for the load rating work are the AASHTO LRFR-19, AASHTO LRFR-11, AASHTO LRFD05, CS454/20, so in this research work the load rating work as per the Indian Codes is trying to be achieved. In this paper modelling and comparison of two PSC Post Tensioned Single Span Box Girder of span length 40m is carried out on the MIDAS Civil software and the objective of the study is to evaluate the load carrying capacity of the two different model based on the value of Flexural B.M, S.F and vertical displacement. The two models which are modelled among them the first model represent the state of newly constructed bridge and the other model represent the condition of the same bridge but after a stipulated time period. It was found out that the bridge loses it’s structural strength and capacity after a time period of 70 years. It was discovered that there is a considerable increase of 149.33% and 34.8% in the value of vertical displacement and Bending moment in the bridge model which was analysed after a time period of 70 years. The methodology adopted in this paper for the load rating work can also be used on different bridge structures such as Reinforced cement concrete and Pre-stresses Concrete bridges such as Cable stayed, Composite I Girder, T-Girder, I-Girder bridges etc.

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Section: Introductionmentioning

confidence: 99%

Flexural and shear load rate evaluation on Pre-stressed concrete Box Girder Superstructure under the effect of IRC Loading

Srivastava,

Mishra

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…With an unsatisfactory load rating, imposing restrictions becomes mandatory on the allowable vehicular weight to use the bridge. The most common AASHTO's LFR approach (AASHTO, 2002) which incorporates equivalent strip widths to distribute the vehicular load, was found to significantly underestimate the actual bridge capacity (Colombani and Andrawes, 2022;Armendariz and Bowman, 2018;Peiris and Harik, 2019;Wipf et al, 2003) and subsequently provide a lower rating and imposes restrictions thereafter. On the other hand, finite element analysis (FEA) can be incorporated to improve accuracy, however, FEA is complex with associated uncertainties related to the modelling assumptions for old inservice bridges (Armendariz and Bowman, 2018;Davids et al, 2013;Khoury et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The most common AASHTO's LFR approach (AASHTO, 2002) which incorporates equivalent strip widths to distribute the vehicular load, was found to significantly underestimate the actual bridge capacity (Colombani and Andrawes, 2022;Armendariz and Bowman, 2018;Peiris and Harik, 2019;Wipf et al, 2003) and subsequently provide a lower rating and imposes restrictions thereafter. On the other hand, finite element analysis (FEA) can be incorporated to improve accuracy, however, FEA is complex with associated uncertainties related to the modelling assumptions for old inservice bridges (Armendariz and Bowman, 2018;Davids et al, 2013;Khoury et al, 2019). Therefore, to utilize the reserved capacity of the bridge and to come up with a more realistic rating factor, AASHTO MBE (AASHTO, 2018) recommended non-destructive on-site load testing of the bridges such as diagnostic and proof load tests.…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical approaches for load rating reinforced concrete slab bridge

Mirdad

Andrawes

2023

Advances in Structural Engineering

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Load testing of bridges is often used as a reliable method for assessing the capacity of in-service bridges with low analytical load rating factors. This paper presents a detailed load rating study of an 82-year-old concrete slab bridge with an unusually large aspect ratio of 3.73 by performing non-destructive diagnostic and proof load tests. The test-based modified rating factor is evaluated based on the American Association of State Highway and Transportation Officials (AASHTO) approach and the structural effective strip width approach which is then compared with the analytical rating factor from a simplified 1-D beam-line model. Field data is also used to evaluate the impact of the rotational stiffness of the bridge on its global response and load rating factor. The field test results based on the AASHTO approach reveal that the rating factor improves by up to 53% compared to the analytical rating factor. Monitoring the rotational residual response at the bridge supports is proven to be an effective method for assessing the global response of the bridge during field testing. The study shows that adding a rotational spring with a field-calibrated rotational stiffness to the 1-D analytical model of the bridge can significantly increase the load rating factor.

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Comparison of load rating of reinforced concrete slab bridge using analytical and field testing approaches

Colombani

Andrawes

2021

Innov. Infrastruct. Solut.

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Bridge Load Rating

Cited by 7 publications

References 15 publications

Flexural and shear load rate evaluation on Pre-stressed concrete Box Girder Superstructure under the effect of IRC Loading

Flexural and shear load rate evaluation on Pre-stressed concrete Box Girder Superstructure under the effect of IRC Loading

Experimental and analytical approaches for load rating reinforced concrete slab bridge

Comparison of load rating of reinforced concrete slab bridge using analytical and field testing approaches

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