Fracture Mechanics–Based Fatigue Life Prediction Method for RC Slabs in Punching Shear Failure Mode

Deng, Pengru; Matsumoto, Takashi

doi:10.1061/(asce)st.1943-541x.0002504

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…Most of these models can be divided into the following four categories, that is, stress-based approaches, [3][4][5][6][7][8] strainbased approaches, [9][10][11][12][13][14][15] strain-energy-based approaches, [16][17][18][19][20][21][22][23] and fracture mechanics approaches. [24][25][26][27][28][29] Among these fatigue life prediction models, those that combine the concept of critical plane and strain energy density are considered highly advanced for estimating multiaxial fatigue life of materials. 22 One of the widely used fatigue life prediction models that belongs to this category was developed by Socie, 23 which is usually named as the SWT model.…”

Section: Introductionmentioning

confidence: 99%

Multiaxial fatigue life prediction using an improved Smith‐Watson‐Topper model

Li,

Shao,

et al. 2024

Fatigue Fract Eng Mat Struct

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In this paper, the SWT model was improved by incorporating the Walker equation into the strain–life curve. The established model takes into account the material's sensitivity to mean stress by introducing the Walker exponent, w. Under uniaxial loading condition, the proposed model can reduce to the SWT model, Manson‐Coffin equation, and Walker model for w values of 0.5, 1, and 0, respectively. Under multiaxial symmetric loading, when w = 0.5, the proposed model can be simplified as another SWT correction model (CXH) proposed by Chen et al. The prediction accuracy of the established model was validated using about 200 data points collected from literature. These data points were obtained from tests conducted on eight different kinds of metals under various multiaxial loading paths. The verification results indicate that 96.8% and 97.9% of the data points fall within the factor‐of‐three boundary for the loading paths without and with mean stresses, respectively.

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Section: Introductionmentioning

confidence: 99%

Multiaxial fatigue life prediction using an improved Smith‐Watson‐Topper model

Li,

Shao,

et al. 2024

Fatigue Fract Eng Mat Struct

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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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“…The compressive behavior of FRC is modeled through a linear elastic law ( σ − ε ) in conjunction with Navier’s hypothesis, applied only to the ligament. The crack opening is evaluated from the applied moment and the crack depth, obtaining a stress profile in the section in each crack step [ 30 , 31 , 32 , 33 ], using an expression proposed by [ 34 ]. Crack patterns are not evaluated because the model only considers a 1D section.…”

Section: Introductionmentioning

confidence: 99%

Planar Crack Approach to Evaluate the Flexural Strength of Fiber-Reinforced Concrete Sections

et al. 2022

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This article describes a model based on concepts of Fracture Mechanics to evaluate the flexural strength of fiber-reinforced concrete (FRC) sections. The model covers the need by structural engineers to have tools that allow, in a simple way, the designing of FRC sections and avoiding complex calculations through finite elements. It consists of an analytical method that models FRC post-cracking behavior with a cohesive linear softening law (σ − w). We use a compatibility equation based on the planar crack hypothesis, i.e., the assumption that the crack surfaces remain plane throughout the fracture process, which was recently proven true using digital image correlation. Non-cracked concrete bulk follows a stress–strain law (σ − ε) combined with the Bernoulli–Navier assumption. We define a brittleness number derived from non-dimensional analyses, which includes the beam size and the softening characteristics. We show that this parameter is key to determining the FRC flexural strength, characterizing fiber-reinforced concrete, and reproducing the size-effect of sections in flexure. Moreover, we propose an expression to calculate the flexural strength of FRC as a function of the cited brittleness number. The model also gives the ratio between the residual strength in service conditions and the flexural strength. Model results show a good agreement with tests in the scientific literature. Finally, we also analyze the brittle–ductile transition in FRC sections.

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Fracture Mechanics–Based Fatigue Life Prediction Method for RC Slabs in Punching Shear Failure Mode

Cited by 8 publications

References 24 publications

Multiaxial fatigue life prediction using an improved Smith‐Watson‐Topper model

Multiaxial fatigue life prediction using an improved Smith‐Watson‐Topper model

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

Planar Crack Approach to Evaluate the Flexural Strength of Fiber-Reinforced Concrete Sections

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