Determination of dominant degradation mechanisms of RC bridge deck slabs under cyclic moving loads

Deng, Pengru; Matsumoto, Takashi

doi:10.1016/j.ijfatigue.2018.03.033

Cited by 14 publications

(12 citation statements)

References 23 publications

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“…In real practical engineering, moving loads like the moving vehicles in traffic contribute a serious degradation to the fatigue life of bridge structures when compared to the fixed pulsating (Matsui 1978). Approximately 2 to 3 order differences in service life reduction have been reported experimentally in RC bridge deck (Deng and Matsumoto 2018;Tang et al 2014). In addition, a similar reduction was reported when the water coupling effect was considered under cyclic loading conditions ).…”

Section: Applied Loadingmentioning

confidence: 94%

Response of Reinforced Concrete Dapped-End Beams Exhibiting Bond Deterioration Subjected to Static and Cyclic Loading

Quadri

Fujiyama

2021

ACT

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In existing bridge structures, reinforced concrete dapped-end beams/girders (RCDEB) are frequently subjected to service loadings that exceed their design capacity, due to increasing economic and population growth. Dapped-end beams are prone to the accumulation of water due to improper drainage and sealing of the joint, providing favorable conditions for corrosion due to the stagnation of chloride rich water from de-icing salts used on roads. The situation can get even worse when freezing and thawing due to extreme weather conditions is present. Due to difficulties in maintenance of the dapped-end regions, this often leads to the deterioration of the concrete around the recess and bond deterioration, which ultimately results in durability issues. Unfortunately, the performance of RCDEB exhibiting corrosion induced bond deterioration is still not well understood. Hence, experimental, and numerical investigations were conducted to understand better the response of RCDEB subjected to static and cyclic loading, with the presence of bond deterioration. Furthermore, the static capacity of the beam was adopted to consider the variable amplitude cyclic loading at an increment of 15% static capacity for every 20 cycles. The reliability of the numerical examination under the direct-path constitutive models of concrete was extended to the moving load scenario by applying a lower load amplitude than the static capacity. It is shown that the prominent failure mechanisms observed in both static and cyclic tests were diagonal tension and shear. Through numerical investigations, it is also shown that from the damage level developed in the RCDEB under the moving load at a relatively low magnitude, high stresses were found within a relatively short number of cycles, which raises a serious cause for concern.

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Section: Applied Loadingmentioning

confidence: 94%

Response of Reinforced Concrete Dapped-End Beams Exhibiting Bond Deterioration Subjected to Static and Cyclic Loading

Quadri

Fujiyama

2021

ACT

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“…Subsequently, the fatigue life prediction and evaluation of road bridge RC slabs have been discussed (Abe 2015). In addition, researchers have investigated analytically the dominant degradation mechanisms (Suthiwarapirak et al 2006;Drar et al 2016;Deng et al 2018) and fracture me-chanics (Deng et al 2019) of RC slab fatigue. The fatigue-induced structural deterioration has also been assessed numerically by Huang (Huang et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Image Analysis for Deformation Behaviors of RC Beams with Simulated Deteriorations under Moving Wheel Load

Nagai

Deng

Matsumoto

2022

ACT

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In Japan, RC bridges slabs constructed during the high economic growth period are suffering from severe deteriorate due to fatigue. In cold and snowy regions, in addition to fatigue, the deterioration is accelerated and aggravated simultaneously by freeze-thaw cycles and water penetration simultaneously. Hence, in this study, aiming at investigating the deterioration due to this combined action, three RC beams were artificially damaged on the top surface by introducing expansion agents to simulate the freeze-thaw cycle damages beforehand, and then subjected to moving wheel load under either dry or wet condition. In the experiment, a scaling-off and a disintegration were observed on the top surface due to the existence of water. Besides, to facilitate the elucidation of the mechanisms, image analysis was employed to obtain the displacement distributions and strain distributions on the side surfaces of the specimens during the test. The results of image analysis clearly manifested that the water-induced deteriorations lead to a localized compressive strain on the upper part of the beams as well as detrimentally affected the propagation of the shear and bending cracks under the moving wheel load. In summary, the mechanical reasons of the remarkably shortened fatigue life of artificially damaged RC bridge slabs due to combined fatigue loads and water penetration were uncovered in this study taking advantage of the strengths of image analysis, which also provides reference and inspiration for further related studies.

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“…Many concrete structures such as bridge decks, airport runways, concrete pavements, and offshore structures experience a million cycles of repetitive loading in their service life (1,2). The exposure to repetitive loading reduces the stiffness of the concrete structures; this in turn leads to fracture generation as a result of changes caused by the progressive growth of micro-cracks.…”

Section: Introductionmentioning

confidence: 99%

“…The exposure to repetitive loading reduces the stiffness of the concrete structures; this in turn leads to fracture generation as a result of changes caused by the progressive growth of micro-cracks. When the repeated loads are applied at high frequency for a prolonged period, this can eventually lead to fatigue failure (1)(2)(3). For this reason, in the design of these concrete structures, increasing attention is now being paid to the fatigue characteristics of the constituent materials.…”

Section: Introductionmentioning

confidence: 99%

Prediction of flexural fatigue life and failure probability of normal weight concrete

et al. 2022

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Fatigue life has to be considered in the design of many concrete structures at various stress levels and stress ratios. Many flexural fatigue test results of plain normal-weight concrete are available in the literature and almost every set of test results provides different fatigue equations. It is necessary, though, to have a common fatigue equation to predict the design fatigue life of concrete structures under flexural load with reasonable accuracy. Therefore, a database of flexural fatigue test results was created for concrete with strengths ranging from 25 to 65 MPa; this database was used to derive new fatigue equations (Wöhler fatigue equation and S-N power relationship) for predicting the flexural fatigue life of normal-weight concrete. The concept of equivalent fatigue life was introduced to obtain a fatigue equation using the same stress ratio. A probabilistic analysis was also carried out to develop flexural fatigue equations that incorporate failure probabilities.

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Determination of dominant degradation mechanisms of RC bridge deck slabs under cyclic moving loads

Cited by 14 publications

References 23 publications

Response of Reinforced Concrete Dapped-End Beams Exhibiting Bond Deterioration Subjected to Static and Cyclic Loading

Response of Reinforced Concrete Dapped-End Beams Exhibiting Bond Deterioration Subjected to Static and Cyclic Loading

Image Analysis for Deformation Behaviors of RC Beams with Simulated Deteriorations under Moving Wheel Load

Prediction of flexural fatigue life and failure probability of normal weight concrete

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